2010 Cadillac Truck Escalade AWD V8-6.2L Page 480
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the infrared module.
2. Ignition OFF, test for less than 5.0 ohms between the ground circuit terminal 12 and ground.
锟斤拷If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, rear audio ON, test for 10.0-11.0 volts between the supply voltage circuit terminal 4 and ground.
锟斤拷If less than the specified range, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the rear audio/HVAC module.
锟斤拷If greater than the specified range, test the voltage supply circuit for a short to voltage. If the circuit tests normal, replace the rear
audio/HVAC module.
4. If all circuits test normal, replace the infrared module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Audio System Transceiver Module Replacement (See: Accessories and Optional Equipment/Radio, Stereo, and Compact
Disc/Radio/Stereo/Service and Repair/Audio System Transceiver Module Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for Rear Audio/HVAC Module replacement, setup,
and programming
B1453
DTC B1453
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1453 01
- Run and Crank/On and Start Power Circuit - Short to Battery
DTC B1453 06
- Run and Crank/On and Start Power Circuit - Short to Ground or Open
Diagnostic Fault Information
Circuit/System Description
The Run and Crank/On and Start Power signal connects the Serial Data Gateway Module (SDGM) along with numerous other modules to the
vehicle 12-volt system through a fused relay in the fuse block - underhood. This relay is closed by the Body Control Module (BCM) based on the
key being in either the Run or Crank position.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
B1453 01
Ignition is in ACC position.
B1453 06
Ignition is in RUN position.
Saturday, November 30, 2019
2010 Cadillac Truck Escalade AWD V8-6.2L Page 48
2010 Cadillac Truck Escalade AWD V8-6.2L Page 48
P0776 - P0816
P0776 - P0816
2010 Cadillac Truck Escalade AWD V8-6.2L Page 479
2010 Cadillac Truck Escalade AWD V8-6.2L Page 479
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1449 03
- Remote Device Voltage Below Threshold
DTC B1449 07
- Remote Device Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
The infrared module is supplied with 10.5 volts from the rear audio/HVAC module when the rear audio system is active. The infrared module is
permanently grounded at G300.
Conditions for Running the DTC
* Ignition ON.
* Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
The DTC will set when the rear audio/HVAC module detects a short to voltage, short to ground, or an open/high resistance in the infrared module
voltage signal circuit.
Action Taken When the DTC Sets
The rear audio/HVAC module sets the DTC and the infrared module will be disabled.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Video Entertainment System Description and Operation (Non-Headrest DVD Systems) (See: Accessories and Optional Equipment/Description
and Operation/Video Entertainment System Description and Operation (Non-Headrest DVD Systems))Video Entertainment System Description
and Operation (Dual Headrest DVD Systems) (See: Accessories and Optional Equipment/Description and Operation/Video Entertainment System
Description and Operation (Dual Headrest DVD Systems))
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1449 03
- Remote Device Voltage Below Threshold
DTC B1449 07
- Remote Device Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
The infrared module is supplied with 10.5 volts from the rear audio/HVAC module when the rear audio system is active. The infrared module is
permanently grounded at G300.
Conditions for Running the DTC
* Ignition ON.
* Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
The DTC will set when the rear audio/HVAC module detects a short to voltage, short to ground, or an open/high resistance in the infrared module
voltage signal circuit.
Action Taken When the DTC Sets
The rear audio/HVAC module sets the DTC and the infrared module will be disabled.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
Reference Information
Schematic Reference
Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Video Entertainment System Description and Operation (Non-Headrest DVD Systems) (See: Accessories and Optional Equipment/Description
and Operation/Video Entertainment System Description and Operation (Non-Headrest DVD Systems))Video Entertainment System Description
and Operation (Dual Headrest DVD Systems) (See: Accessories and Optional Equipment/Description and Operation/Video Entertainment System
Description and Operation (Dual Headrest DVD Systems))
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 585
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 585
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
OnStar Description and Operation (See: Accessories and Optional Equipment/Description and Operation/OnStar Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone.
2. Test for less than 10 Ohms between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the circuit for an open/high resistance.
3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal B and ground.
瀚慖f less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
CIM.
瀚慖f greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.
4. If all circuits test normal, replace the B24 cellular phone microphone.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mobile Telephone Microphone Replacement (See: Accessories and Optional Equipment/Cellular Phone/Cellular Phone Microphone/Service
and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for CIM replacement, setup, and programming
Communication Interface Module
DTC B2462 (Communication Interface Module)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2462 02
- Global Positioning System (GPS) Antenna Malfunction Short to Ground
DTC B2462 04
- Global Positioning System (GPS) Antenna Malfunction Open Circuit
Circuit/System Description
The telematics communication interface control module receives information from the cellular phone and navigation antenna located on the outside
of the vehicle. The cellular phone and navigation antenna is connected to the telematics communication interface control module via a shielded
coaxial cable. The antenna cable also provides a path for DC current for powering the cellular phone and navigation antenna.
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
OnStar Description and Operation (See: Accessories and Optional Equipment/Description and Operation/OnStar Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone.
2. Test for less than 10 Ohms between the low reference circuit terminal A and ground.
瀚慖f greater than the specified range, test the circuit for an open/high resistance.
3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal B and ground.
瀚慖f less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
CIM.
瀚慖f greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.
4. If all circuits test normal, replace the B24 cellular phone microphone.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mobile Telephone Microphone Replacement (See: Accessories and Optional Equipment/Cellular Phone/Cellular Phone Microphone/Service
and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for CIM replacement, setup, and programming
Communication Interface Module
DTC B2462 (Communication Interface Module)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2462 02
- Global Positioning System (GPS) Antenna Malfunction Short to Ground
DTC B2462 04
- Global Positioning System (GPS) Antenna Malfunction Open Circuit
Circuit/System Description
The telematics communication interface control module receives information from the cellular phone and navigation antenna located on the outside
of the vehicle. The cellular phone and navigation antenna is connected to the telematics communication interface control module via a shielded
coaxial cable. The antenna cable also provides a path for DC current for powering the cellular phone and navigation antenna.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 478
2010 Cadillac Truck Escalade AWD V8-6.2L Page 478
锟斤拷If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
Note: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
4. Perform the ignition switch component test. The test should pass.
锟斤拷If the ignition switch fails, replace the ignition switch.
5. Ignition OFF, disconnect the X1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the BCM
and ground.
* Ignition key resistor signal terminal 4
* Off/Run/Crank voltage terminal 2
* Accessory voltage terminal 21
* Ignition 1 voltage terminal 14
锟斤拷If greater than specified, test the circuit for a short to voltage.
6. Test for less than 1.0 ohm of resistance between the BCM and the ignition switch on the following circuit terminals.
* Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 6
* Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5
* Accessory voltage, BCM terminal 21 and ignition switch terminal 3
* Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 2
锟斤拷If greater than specified, repair the circuit for open/high resistance
7. Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
锟斤拷If less than specified, repair the signal circuit for a short to ground.
8. If all circuits test normal, replace the BCM.
Component Testing
Ignition Switch
1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Using the Resistance Test table below, check the resistance between the terminals of the ignition switch listed in each switch position.
If any reading is not as specified, replace the ignition switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
* Ignition and Start Switch Replacement (See: Powertrain Management/Ignition System/Sensors and Switches - Ignition System/Ignition
Switch/Service and Repair)
B1449
DTC B1449
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
锟斤拷If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
Note: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
4. Perform the ignition switch component test. The test should pass.
锟斤拷If the ignition switch fails, replace the ignition switch.
5. Ignition OFF, disconnect the X1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the BCM
and ground.
* Ignition key resistor signal terminal 4
* Off/Run/Crank voltage terminal 2
* Accessory voltage terminal 21
* Ignition 1 voltage terminal 14
锟斤拷If greater than specified, test the circuit for a short to voltage.
6. Test for less than 1.0 ohm of resistance between the BCM and the ignition switch on the following circuit terminals.
* Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 6
* Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5
* Accessory voltage, BCM terminal 21 and ignition switch terminal 3
* Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 2
锟斤拷If greater than specified, repair the circuit for open/high resistance
7. Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
锟斤拷If less than specified, repair the signal circuit for a short to ground.
8. If all circuits test normal, replace the BCM.
Component Testing
Ignition Switch
1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Using the Resistance Test table below, check the resistance between the terminals of the ignition switch listed in each switch position.
If any reading is not as specified, replace the ignition switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
* Ignition and Start Switch Replacement (See: Powertrain Management/Ignition System/Sensors and Switches - Ignition System/Ignition
Switch/Service and Repair)
B1449
DTC B1449
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 477
2010 Cadillac Truck Escalade AWD V8-6.2L Page 477
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify that the following DTCs are not set: U1814, B1428.
锟斤拷If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding
ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in
correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.
Circuit/System Testing
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Inspect for an open Ign Switch fuse. The fuse should be OK.
锟斤拷If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
* Battery positive voltage of the ignition switch
* Accessory voltage
* Off/Run/Crank voltage
* Ignition 1 voltage
* Accessory wakeup serial data (BCM output)
* Run/crank ignition 1 voltage (BCM output)
2. Disconnect the harness connector at the ignition switch.
3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify that the following DTCs are not set: U1814, B1428.
锟斤拷If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding
ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in
correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.
Circuit/System Testing
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Inspect for an open Ign Switch fuse. The fuse should be OK.
锟斤拷If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
* Battery positive voltage of the ignition switch
* Accessory voltage
* Off/Run/Crank voltage
* Ignition 1 voltage
* Accessory wakeup serial data (BCM output)
* Run/crank ignition 1 voltage (BCM output)
2. Disconnect the harness connector at the ignition switch.
3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 476
2010 Cadillac Truck Escalade AWD V8-6.2L Page 476
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1441 01
- Device Ignition OFF, RUN, and CRANK Circuit Short to Battery
DTC B1441 06
- Device Ignition OFF, RUN, and CRANK Circuit Short to Ground or Open
Diagnostic Fault Information
Circuit/System Description
This vehicles power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete
ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a
reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can
allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other
modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this
information to identify the operators desired power mode and activate specific discrete signals, and serial data messages for the operation of many
different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data
message does not match what the individual module can see from its own connections.
The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Several relays controlled by
the BCM are switched ignition voltage outputs the are pass through circuits within the BCM directly from the ignition switch. If these circuits short
to ground, the fuse to the ignition switch will open.
Conditions for Running the DTC
Ignition switch is in the START position.
Conditions for Setting the DTC
B1441 01
Off/run/crank voltage circuit is shorted to voltage for more than 2 seconds.
B1441 06
Off/run/crank voltage circuit is open for more than 2 seconds.
Action Taken When the DTC Sets
* The BCM operates in a fail-safe power mode dependent on the last valid power mode detected and the state of the engine run flag data on the
GMLAN serial data communications circuits.
* The other modules on the vehicle operate in a fail-safe power mode dependent on the last valid power mode transmitted by the BCM and the
state of the engine run flag on the GMLAN serial data communications circuits.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
* A short to ground in the accessory wakeup serial data circuit will cause an open fuse to the ignition switch. DTC U1814 should be current.
* A short to ground in the run/crank ignition 1 voltage circuit of the run crank relay will cause an open fuse to the ignition switch. DTC B1428
should be current.
* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters
listed in Circuit/System Verification will determine if there is a power mode fault.
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1441 01
- Device Ignition OFF, RUN, and CRANK Circuit Short to Battery
DTC B1441 06
- Device Ignition OFF, RUN, and CRANK Circuit Short to Ground or Open
Diagnostic Fault Information
Circuit/System Description
This vehicles power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete
ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a
reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can
allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other
modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this
information to identify the operators desired power mode and activate specific discrete signals, and serial data messages for the operation of many
different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data
message does not match what the individual module can see from its own connections.
The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Several relays controlled by
the BCM are switched ignition voltage outputs the are pass through circuits within the BCM directly from the ignition switch. If these circuits short
to ground, the fuse to the ignition switch will open.
Conditions for Running the DTC
Ignition switch is in the START position.
Conditions for Setting the DTC
B1441 01
Off/run/crank voltage circuit is shorted to voltage for more than 2 seconds.
B1441 06
Off/run/crank voltage circuit is open for more than 2 seconds.
Action Taken When the DTC Sets
* The BCM operates in a fail-safe power mode dependent on the last valid power mode detected and the state of the engine run flag data on the
GMLAN serial data communications circuits.
* The other modules on the vehicle operate in a fail-safe power mode dependent on the last valid power mode transmitted by the BCM and the
state of the engine run flag on the GMLAN serial data communications circuits.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
* A short to ground in the accessory wakeup serial data circuit will cause an open fuse to the ignition switch. DTC U1814 should be current.
* A short to ground in the run/crank ignition 1 voltage circuit of the run crank relay will cause an open fuse to the ignition switch. DTC B1428
should be current.
* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters
listed in Circuit/System Verification will determine if there is a power mode fault.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 475
2010 Cadillac Truck Escalade AWD V8-6.2L Page 475
2. Disconnect the harness connector at the ignition switch.
3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
锟斤拷If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
Note: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
4. Perform the ignition switch component test. The test should pass.
锟斤拷If the ignition switch fails, replace the ignition switch.
5. Ignition OFF, disconnect the X 1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the
BCM and ground.
* Ignition key resistor signal terminal 4
* Off/Run/Crank voltage terminal 2
* Accessory voltage terminal 21
* Ignition 1 voltage terminal 14
锟斤拷If greater than specified, test the circuit for a short to voltage.
6. Test for less than 1.0 ohm of resistance between the BCM and the ignition switch on the following circuit terminals.
* Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 6
* Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5
* Accessory voltage, BCM terminal 21 and ignition switch terminal 3
* Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 2
锟斤拷If greater than 1 ohm, repair the circuit for open/high resistance
7. Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
锟斤拷If less than specified, repair the signal circuit for a short to ground.
8. If all circuits test normal, replace the BCM.
Component Testing
Ignition Switch
1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Using the Resistance Test table below, check the resistance between the terminals of the ignition switch listed in each switch position.
If any reading is not as specified, replace the ignition switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
* Ignition and Start Switch Replacement (See: Powertrain Management/Ignition System/Sensors and Switches - Ignition System/Ignition
Switch/Service and Repair)
B1441
DTC B1441
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
2. Disconnect the harness connector at the ignition switch.
3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
锟斤拷If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
Note: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
4. Perform the ignition switch component test. The test should pass.
锟斤拷If the ignition switch fails, replace the ignition switch.
5. Ignition OFF, disconnect the X 1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the
BCM and ground.
* Ignition key resistor signal terminal 4
* Off/Run/Crank voltage terminal 2
* Accessory voltage terminal 21
* Ignition 1 voltage terminal 14
锟斤拷If greater than specified, test the circuit for a short to voltage.
6. Test for less than 1.0 ohm of resistance between the BCM and the ignition switch on the following circuit terminals.
* Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 6
* Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5
* Accessory voltage, BCM terminal 21 and ignition switch terminal 3
* Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 2
锟斤拷If greater than 1 ohm, repair the circuit for open/high resistance
7. Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
锟斤拷If less than specified, repair the signal circuit for a short to ground.
8. If all circuits test normal, replace the BCM.
Component Testing
Ignition Switch
1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Using the Resistance Test table below, check the resistance between the terminals of the ignition switch listed in each switch position.
If any reading is not as specified, replace the ignition switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
* Ignition and Start Switch Replacement (See: Powertrain Management/Ignition System/Sensors and Switches - Ignition System/Ignition
Switch/Service and Repair)
B1441
DTC B1441
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 584
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 584
6. If all circuits test normal, replace the HSM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater
Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming
B2455
DTC B2455
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provide an overview of each diagnostic category.
DTC Descriptor
DTC B2455 04
- Cellular Phone Microphone Circuit Malfunction Open Circuit
Diagnostic Fault Information
Circuit/System Description
The communication interface module (CIM) provides the cellular phone microphone with a supplied voltage on the cellular phone microphone
signal circuit. When the microphone is in use, voice data from the user is sent back to the CIM on the signal circuit. The CIM provides a ground for
the microphone via the low reference circuit.
Conditions for Running the DTC
* The ignition must be in the RUN or ACC position.
* The system voltage is at least 9.5 V and no more than 15.5 V.
Conditions for Setting the DTC
* The CIM detects an open, short to ground or short to voltage in the cellular phone microphone signal circuit for 10 seconds or greater.
* The CIM detects an open/high resistance in the drain wire circuit for 10 seconds or greater.
Actions Taken When the DTC Sets
* The OnStar(R) status LED turns red.
* The CIM will not receive a signal from the microphone.
* Calls can be placed but the caller cannot be heard.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.
Schematic Reference
OnStar Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/OnStar Schematics)
Connector End View Reference
6. If all circuits test normal, replace the HSM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater
Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming
B2455
DTC B2455
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provide an overview of each diagnostic category.
DTC Descriptor
DTC B2455 04
- Cellular Phone Microphone Circuit Malfunction Open Circuit
Diagnostic Fault Information
Circuit/System Description
The communication interface module (CIM) provides the cellular phone microphone with a supplied voltage on the cellular phone microphone
signal circuit. When the microphone is in use, voice data from the user is sent back to the CIM on the signal circuit. The CIM provides a ground for
the microphone via the low reference circuit.
Conditions for Running the DTC
* The ignition must be in the RUN or ACC position.
* The system voltage is at least 9.5 V and no more than 15.5 V.
Conditions for Setting the DTC
* The CIM detects an open, short to ground or short to voltage in the cellular phone microphone signal circuit for 10 seconds or greater.
* The CIM detects an open/high resistance in the drain wire circuit for 10 seconds or greater.
Actions Taken When the DTC Sets
* The OnStar(R) status LED turns red.
* The CIM will not receive a signal from the microphone.
* Calls can be placed but the caller cannot be heard.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.
Schematic Reference
OnStar Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/OnStar Schematics)
Connector End View Reference
2010 Cadillac Truck Escalade AWD V8-6.2L Page 474
2010 Cadillac Truck Escalade AWD V8-6.2L Page 474
should be current.
* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters
listed in Circuit/System Verification will determine if there is a power mode fault.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify that the following DTCs are not set: U1814, B1428.
锟斤拷If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding
ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in
correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.
Circuit/System Testing
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Inspect for an open Ign Switch fuse. The fuse should be OK.
锟斤拷If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
* Battery positive voltage of the ignition switch
* Accessory voltage
* Off/Run/Crank voltage
* Ignition 1 voltage
* Accessory wakeup serial data (BCM output)
* Run/crank ignition 1 voltage (BCM output)
should be current.
* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters
listed in Circuit/System Verification will determine if there is a power mode fault.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify that the following DTCs are not set: U1814, B1428.
锟斤拷If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding
ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in
correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.
Circuit/System Testing
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Inspect for an open Ign Switch fuse. The fuse should be OK.
锟斤拷If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
* Battery positive voltage of the ignition switch
* Accessory voltage
* Off/Run/Crank voltage
* Ignition 1 voltage
* Accessory wakeup serial data (BCM output)
* Run/crank ignition 1 voltage (BCM output)
2010 Cadillac Truck Escalade AWD V8-6.2L Page 473
2010 Cadillac Truck Escalade AWD V8-6.2L Page 473
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1440 00
- Power Mode Master Input Circuits Mismatch
Diagnostic Fault Information
Circuit/System Description
This vehicles power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete
ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a
reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can
allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other
modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this
information to identify the operators desired power mode and activate specific discrete signals, and serial data messages for the operation of many
different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data
message does not match what the individual module can see from its own connections.
The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Several relays controlled by
the BCM are switched ignition voltage outputs the are pass through circuits within the BCM directly from the ignition switch. If these circuits short
to ground, the fuse to the ignition switch will open.
Conditions for Running the DTC
Ignition switch is in the RUN position.
Conditions for Setting the DTC
* BCM senses an open or short to voltage on the off/run/crank voltage circuit when both ignition accessory/run and ignition run/crank
parameters are active.
* BCM senses an open on the battery positive voltage circuit (to the ignition switch) while engine is running. An open on the battery voltage
circuit can be caused by a short to ground on any of the following circuits:
- Battery positive voltage
- Accessory voltage
- Run/crank ignition 1 voltage
- Off/run/crank voltage
Action Taken When the DTC Sets
* The BCM operates in a fail-safe power mode dependent on the last valid power mode detected and the state of the engine run flag data on the
GMLAN serial data communications circuits.
* The other modules on the vehicle operate in a fail-safe power mode dependent on the last valid power mode transmitted by the BCM and the
state of the engine run flag on the GMLAN serial data communications circuits.
* The vehicle may not start.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
* A short to ground in the accessory wakeup serial data circuit will cause an open fuse to the ignition switch. DTC U1814 should be current.
* A short to ground in the run/crank ignition 1 voltage circuit of the run crank relay will cause an open fuse to the ignition switch. DTC B1428
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1440 00
- Power Mode Master Input Circuits Mismatch
Diagnostic Fault Information
Circuit/System Description
This vehicles power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete
ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a
reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can
allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other
modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this
information to identify the operators desired power mode and activate specific discrete signals, and serial data messages for the operation of many
different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data
message does not match what the individual module can see from its own connections.
The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Several relays controlled by
the BCM are switched ignition voltage outputs the are pass through circuits within the BCM directly from the ignition switch. If these circuits short
to ground, the fuse to the ignition switch will open.
Conditions for Running the DTC
Ignition switch is in the RUN position.
Conditions for Setting the DTC
* BCM senses an open or short to voltage on the off/run/crank voltage circuit when both ignition accessory/run and ignition run/crank
parameters are active.
* BCM senses an open on the battery positive voltage circuit (to the ignition switch) while engine is running. An open on the battery voltage
circuit can be caused by a short to ground on any of the following circuits:
- Battery positive voltage
- Accessory voltage
- Run/crank ignition 1 voltage
- Off/run/crank voltage
Action Taken When the DTC Sets
* The BCM operates in a fail-safe power mode dependent on the last valid power mode detected and the state of the engine run flag data on the
GMLAN serial data communications circuits.
* The other modules on the vehicle operate in a fail-safe power mode dependent on the last valid power mode transmitted by the BCM and the
state of the engine run flag on the GMLAN serial data communications circuits.
* The vehicle may not start.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
* A short to ground in the accessory wakeup serial data circuit will cause an open fuse to the ignition switch. DTC U1814 should be current.
* A short to ground in the run/crank ignition 1 voltage circuit of the run crank relay will cause an open fuse to the ignition switch. DTC B1428
2010 Cadillac Truck Escalade AWD V8-6.2L Page 472
2010 Cadillac Truck Escalade AWD V8-6.2L Page 472
* The system voltage is between 9-16 V.
* The DTC can only set when the output is actively being requested by the module.
Conditions for Setting the DTC
The DTC will set only when the module requests the output and there is a short to ground in the run relay coil control circuit.
Action Taken When the DTC Sets
The module output driver will be shut down and not supply voltage to the circuit.
Conditions for Clearing the DTC
* The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
A short to voltage may cause some accessories to operate with the ignition key out and cause a low battery after extended non vehicle use.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Retained Accessory Power Description and Operation (See: Power and Ground Distribution/Description and Operation/Retained Accessory Power
Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the X5 harness connector at the BCM.
2. Test for greater than infinite resistance between the BCM ignition circuit terminal 13 and ground.
锟斤拷If less than specified, test for a short to ground.
3. If the circuit tests normal, test or replace the BCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming
* The system voltage is between 9-16 V.
* The DTC can only set when the output is actively being requested by the module.
Conditions for Setting the DTC
The DTC will set only when the module requests the output and there is a short to ground in the run relay coil control circuit.
Action Taken When the DTC Sets
The module output driver will be shut down and not supply voltage to the circuit.
Conditions for Clearing the DTC
* The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
A short to voltage may cause some accessories to operate with the ignition key out and cause a low battery after extended non vehicle use.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Retained Accessory Power Description and Operation (See: Power and Ground Distribution/Description and Operation/Retained Accessory Power
Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the X5 harness connector at the BCM.
2. Test for greater than infinite resistance between the BCM ignition circuit terminal 13 and ground.
锟斤拷If less than specified, test for a short to ground.
3. If the circuit tests normal, test or replace the BCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming
2010 Cadillac Truck Escalade AWD V8-6.2L Page 471
2010 Cadillac Truck Escalade AWD V8-6.2L Page 471
锟斤拷If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the
BCM.
4. If all circuits test normal, test or replace the Run/Crank relay.
Component Testing
1. Ignition OFF, disconnect the Run/Crank relay.
2. Test for 70-150 ohms between terminals 85 and 86.
锟斤拷If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
锟斤拷If less than specified, replace the relay.
4. Install a 3-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground.
Measure for less than 5 ohms between terminals 30 and 87.
锟斤拷If greater than specified, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
B1433
DTC B1433
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1433 00
- Ignition Switched Power Relay 2 Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies voltage to the HVAC module and the windshield washer solvent heater (RPO XA7). Voltage is applied
when any of the following conditions are true:
* Ignition Switch is in ACC or RUN.
* The vehicle was remote started.
* The vehicle is in retained accessory power (RAP) mode.
Conditions for Running the DTC
锟斤拷If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the
BCM.
4. If all circuits test normal, test or replace the Run/Crank relay.
Component Testing
1. Ignition OFF, disconnect the Run/Crank relay.
2. Test for 70-150 ohms between terminals 85 and 86.
锟斤拷If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
锟斤拷If less than specified, replace the relay.
4. Install a 3-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground.
Measure for less than 5 ohms between terminals 30 and 87.
锟斤拷If greater than specified, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
B1433
DTC B1433
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1433 00
- Ignition Switched Power Relay 2 Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) supplies voltage to the HVAC module and the windshield washer solvent heater (RPO XA7). Voltage is applied
when any of the following conditions are true:
* Ignition Switch is in ACC or RUN.
* The vehicle was remote started.
* The vehicle is in retained accessory power (RAP) mode.
Conditions for Running the DTC
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 583
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 583
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Verify the type of vehicle and the heated seat system for which the DTC set.
If the DTC set in a hybrid or a non-hybrid vehicle without memory, refer to Circuit/System Testing below.
If the DTC set in a vehicle equipped with memory, refer to DTC B2435 or B2440 (w/o HP2 with memory).
Circuit/System Testing
B2435 02 or B2435 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 19 X4 and the low reference circuit terminal 5 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
瀚慖f greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the HSM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
6. If all circuits test normal, replace the HSM.
B2440 02 or B2440 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 10 X4 and the low reference circuit terminal 7 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
瀚慖f greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Verify the type of vehicle and the heated seat system for which the DTC set.
If the DTC set in a hybrid or a non-hybrid vehicle without memory, refer to Circuit/System Testing below.
If the DTC set in a vehicle equipped with memory, refer to DTC B2435 or B2440 (w/o HP2 with memory).
Circuit/System Testing
B2435 02 or B2435 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 19 X4 and the low reference circuit terminal 5 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
瀚慖f greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the HSM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
6. If all circuits test normal, replace the HSM.
B2440 02 or B2440 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 10 X4 and the low reference circuit terminal 7 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
瀚慖f greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 238
2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 238
If the DTC is set, replace the appropriate K96L left mirror control module or the S79P passenger window switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning)for left mirror control module or passenger window switch
replacement, setup, and programming
B0158
DTC B0158
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B0158 02
- Ambient Air Temperature Sensor Circuit Short to Ground
DTC B0158 05
- Ambient Air Temperature Sensor Circuit High Voltage/Open
Diagnostic Fault Information
Circuit/System Description
The instrument cluster provides the ambient air temperature sensor with a low reference circuit and 5 V signal circuit. The instrument cluster
monitors the voltage drop across the sensor, which is proportional to temperature. When the ambient air temperatures are cold, the resistance of the
sensor is high and the voltage signals are high. When the ambient air temperatures are hot, the resistance of the sensors is low and the voltage
signals are low. The instrument cluster converts the voltage value to a temperature value of Celsius or Fahrenheit that will be displayed by the
driver information center.
Conditions for Running the DTC
The system voltage is between 9-16 V
Conditions for Setting the DTC
B0158 02
The instrument cluster detects the sensor signal circuit is greater than 88掳C (190掳F).
B0158 05
The instrument cluster detects the sensor signal circuit is less than -40掳C (-40掳F).
Action Taken When the DTC Sets
The instrument cluster uses a default air temperature value for further calculations. The driver information center displays ---掳C ( ---掳F).
Conditions for Clearing the DTC
The DTC will become history if the instrument cluster no longer detects a malfunction.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 470
2010 Cadillac Truck Escalade AWD V8-6.2L Page 470
Circuit/System Description
The body control module (BCM) controls the Run/Crank relay through the run/crank relay coil control circuit by applying voltage to the circuit.
The Run/Crank relay is energized when the ignition switch is in ON or START, or when a remote start is requested.
Conditions for Running the DTC
* The system voltage is between 9-16 volts.
* The DTC can only run when the output is activated.
Conditions for Setting the DTC
The BCM detects a short to ground in the run/crank relay coil control circuit.
Action Taken When the DTC Sets
The module output driver will be shut down and not supply voltage to the run/crank relay coil control circuit.
Conditions for Clearing the DTC
* The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
Short to voltage in the run/crank relay coil control circuit will cause the malfunction indicator lamp (MIL) to illuminate with the ignition key OFF,
and the engine will remain running if started and the ignition key is removed.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the Run/Crank relay.
2. Connect a test lamp between the relay coil control circuit terminal 86 and ground.
3. Cycle the ignition ON and OFF. The test lamp should turn ON and OFF when changing ignition switch positions.
锟斤拷If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
Circuit/System Description
The body control module (BCM) controls the Run/Crank relay through the run/crank relay coil control circuit by applying voltage to the circuit.
The Run/Crank relay is energized when the ignition switch is in ON or START, or when a remote start is requested.
Conditions for Running the DTC
* The system voltage is between 9-16 volts.
* The DTC can only run when the output is activated.
Conditions for Setting the DTC
The BCM detects a short to ground in the run/crank relay coil control circuit.
Action Taken When the DTC Sets
The module output driver will be shut down and not supply voltage to the run/crank relay coil control circuit.
Conditions for Clearing the DTC
* The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
Short to voltage in the run/crank relay coil control circuit will cause the malfunction indicator lamp (MIL) to illuminate with the ignition key OFF,
and the engine will remain running if started and the ignition key is removed.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the Run/Crank relay.
2. Connect a test lamp between the relay coil control circuit terminal 86 and ground.
3. Cycle the ignition ON and OFF. The test lamp should turn ON and OFF when changing ignition switch positions.
锟斤拷If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 47
2010 Cadillac Truck Escalade AWD V8-6.2L Page 47
P0712 - P0757
P0712 - P0757
2010 Cadillac CTS Sedan AWD V6-3.6L Page 1480
2010 Cadillac CTS Sedan AWD V6-3.6L Page 1480
The "key" referenced in the DTC descriptor does not refer to the vehicle key. In this case, "key" is referring to the challenge response.
Reference Information
Schematic Reference
Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Immobilizer Description and Operation (without Y41) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and
Operation/Immobilizer Description and Operation (Without Y41))Immobilizer Description and Operation (with Y41) (See: Accessories and
Optional Equipment/Antitheft and Alarm Systems/Description and Operation/Immobilizer Description and Operation (With Y41))
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Important: Because of normal system communications between the RCDLR and ECM, any theft deterrent B-codes must be diagnosed
prior to the diagnosis of P-codes.
Perform the 10-Minute Immobilizer Relearn procedure. Refer to Immobilizer System Component Programming (without RPO Y41) (See:
Accessories and Optional Equipment/Antitheft and Alarm Systems/Testing and Inspection/Programming and Relearning/Immobilizer System
Component Programming (without RPO Y41))Immobilizer System Component Programming (with RPO Y41) (See: Accessories and Optional
Equipment/Antitheft and Alarm Systems/Testing and Inspection/Programming and Relearning/Immobilizer System Component Programming (with
RPO Y41)). The ECM should successfully complete the password learn and the vehicle should start.
If the ECM does not complete the learn or vehicle starting remains disabled, replace the ECM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming
Without Y41
DTC P0513 (without Y41)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0513
- Theft Deterrent Key Incorrect
Circuit/System Description
The theft deterrent module (TDM) sends the prerelease password to the engine control module (ECM) via the serial data circuit. The ECM then
sends a challenge to the TDM. Both the ECM and TDM perform a calculation on this challenge. If the calculated response from the TDM equals
2010 Cadillac Truck Escalade AWD V8-6.2L Page 469
2010 Cadillac Truck Escalade AWD V8-6.2L Page 469
* Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and
15.0 volts.
锟斤拷If not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and Inspection/Component Tests
and General Diagnostics/Charging System Test).
2. Ignition OFF, disconnect the harness connector at the TDM. Refer to Theft Deterrent Module Replacement (See: Accessories and Optional
Equipment/Antitheft and Alarm Systems/Alarm Module/Service and Repair).
3. Ignition OFF and scan tool disconnected, open and close the drivers door, and wait 1 minute. Test for less than 5 ohms between the ground
circuit terminal 3 and ground.
锟斤拷If greater than the specified range, test the ground circuit for an open/high resistance.
4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
锟斤拷If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. If all circuits test normal, replace the TDM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for TDM replacement, set up, and programming.
B1428
DTC B1428
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1428
- Ignition Switched Power Run/Crank Relay Circuit
Diagnostic Fault Information
* Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and
15.0 volts.
锟斤拷If not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and Inspection/Component Tests
and General Diagnostics/Charging System Test).
2. Ignition OFF, disconnect the harness connector at the TDM. Refer to Theft Deterrent Module Replacement (See: Accessories and Optional
Equipment/Antitheft and Alarm Systems/Alarm Module/Service and Repair).
3. Ignition OFF and scan tool disconnected, open and close the drivers door, and wait 1 minute. Test for less than 5 ohms between the ground
circuit terminal 3 and ground.
锟斤拷If greater than the specified range, test the ground circuit for an open/high resistance.
4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
锟斤拷If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. If all circuits test normal, replace the TDM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Control Module References (See: Testing and Inspection/Programming and Relearning) for TDM replacement, set up, and programming.
B1428
DTC B1428
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1428
- Ignition Switched Power Run/Crank Relay Circuit
Diagnostic Fault Information
2010 Cadillac Truck Escalade AWD V8-6.2L Page 468
2010 Cadillac Truck Escalade AWD V8-6.2L Page 468
* Control Module References (See: Testing and Inspection/Programming and Relearning) for rear object alarm module replacement, setup
and programming
B1424
DTC B1424
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1424 00
- Device Voltage Low - Theft Deterrent Module
Diagnostic Fault Information
Circuit/System Description
The theft deterrent module (TDM) monitors the battery positive (B+) voltage available to it. If the voltage at the TDM is between 6-9 volts, and the
voltage being reported by a serial data message is greater than 9 volts, then DTC B1424 00 sets.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
* Voltage at the TDM B+ circuit is between 6-9 volts.
* Reported battery voltage received via serial data is valid and is greater than 9 volts.
* The above conditions have been met for 2 seconds.
Action Taken When the DTC Sets
* The security indicator turns ON.
* The driver information center (DIC) displays the SERVICE THEFT DETERRENT SYSTEM message.
Conditions for Clearing the DTC
* A current DTC clears when the battery voltage at the TDM is greater than 9 volts, or if the voltage reported by serial data is less than 9 volts.
* A history DTC clears after 100 consecutive ignition cycles, if no failures are reported by this diagnostic.
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
* Immobilizer Description and Operation (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and
Operation/Immobilizer Description and Operation)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for rear object alarm module replacement, setup
and programming
B1424
DTC B1424
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1424 00
- Device Voltage Low - Theft Deterrent Module
Diagnostic Fault Information
Circuit/System Description
The theft deterrent module (TDM) monitors the battery positive (B+) voltage available to it. If the voltage at the TDM is between 6-9 volts, and the
voltage being reported by a serial data message is greater than 9 volts, then DTC B1424 00 sets.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
* Voltage at the TDM B+ circuit is between 6-9 volts.
* Reported battery voltage received via serial data is valid and is greater than 9 volts.
* The above conditions have been met for 2 seconds.
Action Taken When the DTC Sets
* The security indicator turns ON.
* The driver information center (DIC) displays the SERVICE THEFT DETERRENT SYSTEM message.
Conditions for Clearing the DTC
* A current DTC clears when the battery voltage at the TDM is greater than 9 volts, or if the voltage reported by serial data is less than 9 volts.
* A history DTC clears after 100 consecutive ignition cycles, if no failures are reported by this diagnostic.
Diagnostic Aids
A low voltage DTC in multiple modules indicates a concern in the charging system.
Reference Information
Schematic Reference
Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
* Immobilizer Description and Operation (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and
Operation/Immobilizer Description and Operation)
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 582
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 582
Circuit/System Description
The heated seat temperature sensor that set this diagnostic trouble code (DTC) is located in the seat cushion just under the seat cover with the seat
heating element. The heated seat module (HSM) supplies a 5 V reference voltage through the temperature sensor signal circuit and a ground
through the low reference circuit to the sensor. The HSM monitors the voltage of the sensor signal circuit to determine the temperature of the seat.
The temperature sensor varies in resistance based on the temperature of the heating element causing the signal voltage to change. Once the seat
reaches the set temperature, the HSM will then cycle the control circuits of the heating elements ON and OFF in order to maintain the desired seat
temperature based on the feedback voltage from the sensor.
Conditions for Running the DTC
The HSM must be powered.
Conditions for Setting the DTC
B2435 02 or B2440 02
The temperature sensor voltage drops below 0.8 V for more than 1 second.
B2435 05 or B2440 05
The temperature sensor voltage is greater than 5 V for more than 1 second.
Action Taken When the DTC Sets
The heated seat back function for the affected seat will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range, and the ignition is cycled OFF then back
to ACC or RUN.
* A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs function.
Circuit/System Description
The heated seat temperature sensor that set this diagnostic trouble code (DTC) is located in the seat cushion just under the seat cover with the seat
heating element. The heated seat module (HSM) supplies a 5 V reference voltage through the temperature sensor signal circuit and a ground
through the low reference circuit to the sensor. The HSM monitors the voltage of the sensor signal circuit to determine the temperature of the seat.
The temperature sensor varies in resistance based on the temperature of the heating element causing the signal voltage to change. Once the seat
reaches the set temperature, the HSM will then cycle the control circuits of the heating elements ON and OFF in order to maintain the desired seat
temperature based on the feedback voltage from the sensor.
Conditions for Running the DTC
The HSM must be powered.
Conditions for Setting the DTC
B2435 02 or B2440 02
The temperature sensor voltage drops below 0.8 V for more than 1 second.
B2435 05 or B2440 05
The temperature sensor voltage is greater than 5 V for more than 1 second.
Action Taken When the DTC Sets
The heated seat back function for the affected seat will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range, and the ignition is cycled OFF then back
to ACC or RUN.
* A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs function.
2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1104
2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1104
P0141
* Before the ECM can report DTC P0135 and P0141 failed, DTCs P0036, P0037, and P0038 must run and pass.
* DTCs P0137, P0138, or P0140 are not set.
* The engine is operating.
* The ignition voltage is 10-18 volts.
* The intake air temperature (IAT) is greater than -30掳C (-22掳F).
* After the previous ignition cycle the engine OFF time was greater than 0 seconds.
* The calculated exhaust temperature is 360-500掳C (680-932掳F).
* The engine is not in decel fuel cut-off (DFCO).
* The internal HO2S 2 resistance is less than 10,000 ohm.
* The HO2S 2 heater is enabled for greater than 120 seconds.
* DTCs P0135 and P0141 run continuously once the above conditions are met for approximately 100 seconds.
Conditions for Setting the DTC
The ECM detects that the internal resistance of an HO2S 1 or HO2S 2 heater is not within the expected range.
Action Taken When the DTC Sets
DTCs P0135 and P0141 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0135 and P0141 are Type B DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Note: It may take up to 8 minutes for the DTC to set.
1. With the engine at normal operating temperature, operate the engine above 1,200 RPM for 2 minutes and then allow the engine to idle. DTCs
P0135 or P0141 should not set.
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B52 HO2S.
2. Ignition ON, test for B+ on the HO2S ignition circuit terminal 1 of the HO2S harness connector.
瀚慖f less than the specified value, repair the ignition voltage circuit of the HO2S heater for a short to ground or an open/high resistance.
3. Ignition OFF, connect a test lamp between the heater control circuit terminal 2 and B+. The test light should not illuminate.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 467
2010 Cadillac Truck Escalade AWD V8-6.2L Page 467
The parking assist control module has detected the 8 V reference circuit is greater than 10.4 V.
Action Taken When the DTC Sets
* The parking assist is disabled.
* The driver information center displays SERVICE PARK ASSIST.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
Object Detection Schematics (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Diagrams/Electrical
Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Object Detection Description and Operation (UFT) (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist
Systems/Description and Operation/Object Detection Description and Operation (UFT))Object Detection Description and Operation (UVC) (See:
Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Description and Operation/Object Detection Description and
Operation (UVC))Object Detection Description and Operation (UD7) (See: Accessories and Optional Equipment/Collision Avoidance and
Parking Assist Systems/Description and Operation/Object Detection Description and Operation (UD7))
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, transmission in REVERSE, observe the scan tool Sensor Feed Voltage Output parameter. The reading should be between 6.3-10.4 V.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at each of the object sensors.
2. Ignition ON, transmission in REVERSE, test for 6.3-10.4 V between the 8 V reference circuit terminal 1 at the rear object sensor harness
connector and ground.
锟斤拷If less than the specified range, test the 8 V reference circuit for a short to ground. If the circuit tests normal, replace the rear object alarm
module.
锟斤拷If greater than the specified range, test the 8 V reference circuit for a short to voltage. If the circuit tests normal, replace the rear object
alarm module.
3. Install each object alarm sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B1405 is not set
as current.
锟斤拷If the DTC is set, replace the object alarm sensor that was connected immediately before the DTC set.
4. If all circuits test normal, replace the rear object alarm module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Rear Object Sensor Replacement (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Parking
Assist Distance Sensor/Service and Repair/Rear Object Sensor Replacement)
The parking assist control module has detected the 8 V reference circuit is greater than 10.4 V.
Action Taken When the DTC Sets
* The parking assist is disabled.
* The driver information center displays SERVICE PARK ASSIST.
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
Object Detection Schematics (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Diagrams/Electrical
Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Object Detection Description and Operation (UFT) (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist
Systems/Description and Operation/Object Detection Description and Operation (UFT))Object Detection Description and Operation (UVC) (See:
Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Description and Operation/Object Detection Description and
Operation (UVC))Object Detection Description and Operation (UD7) (See: Accessories and Optional Equipment/Collision Avoidance and
Parking Assist Systems/Description and Operation/Object Detection Description and Operation (UD7))
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, transmission in REVERSE, observe the scan tool Sensor Feed Voltage Output parameter. The reading should be between 6.3-10.4 V.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at each of the object sensors.
2. Ignition ON, transmission in REVERSE, test for 6.3-10.4 V between the 8 V reference circuit terminal 1 at the rear object sensor harness
connector and ground.
锟斤拷If less than the specified range, test the 8 V reference circuit for a short to ground. If the circuit tests normal, replace the rear object alarm
module.
锟斤拷If greater than the specified range, test the 8 V reference circuit for a short to voltage. If the circuit tests normal, replace the rear object
alarm module.
3. Install each object alarm sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B1405 is not set
as current.
锟斤拷If the DTC is set, replace the object alarm sensor that was connected immediately before the DTC set.
4. If all circuits test normal, replace the rear object alarm module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Rear Object Sensor Replacement (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Parking
Assist Distance Sensor/Service and Repair/Rear Object Sensor Replacement)
2010 Cadillac Truck Escalade AWD V8-6.2L Page 466
2010 Cadillac Truck Escalade AWD V8-6.2L Page 466
Positioning System/Pedal Positioning Sensor/Service and Repair)
* Tilt Motor Replacement (See: Steering and Suspension/Steering/Steering Column/Tilt Wheel Motor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming
B1405
DTC B1405
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1405 02
- Control Module Voltage Reference Output 2 Circuit Short to Ground
DTC B1405 03
- Control Module Voltage Reference Output 2 Circuit Low Voltage
DTC B1405 07
- Control Module Voltage Reference Output 2 Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The parking assist
control module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The parking assist
control module triggers the sensors in a sequential loop. After each sensor transmits, the parking assist control module uses the sensor echo
received through the signal circuit to calculate the distance and position of an object.
Conditions for Running the DTC
* Ignition ON
* Transmission in REVERSE
Conditions for Setting the DTC
B1405 02
The parking assist control module has detected the 8 V reference circuit is shorted to ground.
B1405 03
The parking assist control module has detected the 8 V reference circuit is less than 6.3 V.
Positioning System/Pedal Positioning Sensor/Service and Repair)
* Tilt Motor Replacement (See: Steering and Suspension/Steering/Steering Column/Tilt Wheel Motor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming
B1405
DTC B1405
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1405 02
- Control Module Voltage Reference Output 2 Circuit Short to Ground
DTC B1405 03
- Control Module Voltage Reference Output 2 Circuit Low Voltage
DTC B1405 07
- Control Module Voltage Reference Output 2 Circuit High Voltage
Diagnostic Fault Information
Circuit/System Description
The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The parking assist
control module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The parking assist
control module triggers the sensors in a sequential loop. After each sensor transmits, the parking assist control module uses the sensor echo
received through the signal circuit to calculate the distance and position of an object.
Conditions for Running the DTC
* Ignition ON
* Transmission in REVERSE
Conditions for Setting the DTC
B1405 02
The parking assist control module has detected the 8 V reference circuit is shorted to ground.
B1405 03
The parking assist control module has detected the 8 V reference circuit is less than 6.3 V.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 465
2010 Cadillac Truck Escalade AWD V8-6.2L Page 465
Reference Information
Schematic Reference
* Driver Seat Schematics ()
* Adjustable Pedal Schematics (See: Accessories and Optional Equipment/Pedal Positioning System/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Memory Seats Description and Operation ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector for all position sensors connected to the 5 V reference circuit.
2. Ignition ON, observe all scan tool Driver Position Module sensor parameters in the Data Display screens listed below: The readings should
be 0.0 V.
* Seat 1
* Adj. Pedals Info
* Column Info
锟斤拷If greater than the specified value, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace
the MSM.
* Horizontal position sensor terminal 3 X2
* Front vertical position sensor terminal 1 X2
* Rear vertical position sensor terminal 5 X2
* Recline position sensor terminal 2
* Lumbar horizontal position sensor terminal D X2
* Lumbar vertical position sensor terminal B X2
* Adjustable pedal position sensor terminal 1
* Steering wheel tilt actuator/position sensor terminal C
3. Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit at any one of the position sensors and ground.
锟斤拷If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the MSM.
锟斤拷If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
4. Connect each position sensor one at a time and verify that the DTC does not set as current.
锟斤拷If the DTC sets as current, replace the appropriate position sensor.
5. If all circuits test normal, replace the MSM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Seat Adjuster Replacement (with HP2) ()Front Seat Adjuster Replacement (without HP2) ()
* Seat Lumbar Sub System Replacement ()
* Front Seat Recliner Actuator Motor Replacement ()
* Brake and Accelerator Pedal Adjuster Position Sensor Replacement (With Memory Seats) (See: Accessories and Optional Equipment/Pedal
Reference Information
Schematic Reference
* Driver Seat Schematics ()
* Adjustable Pedal Schematics (See: Accessories and Optional Equipment/Pedal Positioning System/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Memory Seats Description and Operation ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector for all position sensors connected to the 5 V reference circuit.
2. Ignition ON, observe all scan tool Driver Position Module sensor parameters in the Data Display screens listed below: The readings should
be 0.0 V.
* Seat 1
* Adj. Pedals Info
* Column Info
锟斤拷If greater than the specified value, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace
the MSM.
* Horizontal position sensor terminal 3 X2
* Front vertical position sensor terminal 1 X2
* Rear vertical position sensor terminal 5 X2
* Recline position sensor terminal 2
* Lumbar horizontal position sensor terminal D X2
* Lumbar vertical position sensor terminal B X2
* Adjustable pedal position sensor terminal 1
* Steering wheel tilt actuator/position sensor terminal C
3. Ignition ON, test for 4.8 - 5.2 V between the 5 V reference circuit at any one of the position sensors and ground.
锟斤拷If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the MSM.
锟斤拷If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
4. Connect each position sensor one at a time and verify that the DTC does not set as current.
锟斤拷If the DTC sets as current, replace the appropriate position sensor.
5. If all circuits test normal, replace the MSM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Seat Adjuster Replacement (with HP2) ()Front Seat Adjuster Replacement (without HP2) ()
* Seat Lumbar Sub System Replacement ()
* Front Seat Recliner Actuator Motor Replacement ()
* Brake and Accelerator Pedal Adjuster Position Sensor Replacement (With Memory Seats) (See: Accessories and Optional Equipment/Pedal
2010 Cadillac Truck Escalade AWD V8-6.2L Page 464
2010 Cadillac Truck Escalade AWD V8-6.2L Page 464
Circuit/System Description
The memory seat module (MSM) supplies a 5-volt reference voltage to the driver seat, adjustable pedal, and the tilt steering wheel position sensors.
The MSM monitors this reference voltage to ensure the accuracy of the voltages being returned from the sensors. If the voltage exceeds the normal
operating range, errors will occur in the memory recall operations of the seat, adjustable pedals, and steering wheel.
Conditions for Running the DTC
The memory seat module must be powered.
Conditions for Setting the DTC
The following conditions exist for more than 1 second:
B1395 02
The reference voltage drops below 4.8 volts for more than 300 mS.
B1395 05
The reference voltage exceeds 5.2 V for more than 300 mS.
Action Taken When the DTC Sets
All memory recall functions will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range, and the ignition is cycled OFF then back
to ACC or RUN.
* A history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.
Diagnostic Aids
An internal short to ground in one of the position sensors may set this DTC.
Circuit/System Description
The memory seat module (MSM) supplies a 5-volt reference voltage to the driver seat, adjustable pedal, and the tilt steering wheel position sensors.
The MSM monitors this reference voltage to ensure the accuracy of the voltages being returned from the sensors. If the voltage exceeds the normal
operating range, errors will occur in the memory recall operations of the seat, adjustable pedals, and steering wheel.
Conditions for Running the DTC
The memory seat module must be powered.
Conditions for Setting the DTC
The following conditions exist for more than 1 second:
B1395 02
The reference voltage drops below 4.8 volts for more than 300 mS.
B1395 05
The reference voltage exceeds 5.2 V for more than 300 mS.
Action Taken When the DTC Sets
All memory recall functions will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range, and the ignition is cycled OFF then back
to ACC or RUN.
* A history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.
Diagnostic Aids
An internal short to ground in one of the position sensors may set this DTC.
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 581
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 581
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 10 X4 and the low reference circuit terminal 7 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
瀚慖f greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the HSM.
6. If all circuits test normal, replace the HSM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater
Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming
B2440
DTC B2435 or B2440 (HP2 or Dealer Installed w/o Memory)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2435 02
- Left Seat Back Heater Sensor Circuit Short to Ground
DTC B2435 05
- Left Seat Back Heater Sensor Circuit Short to Battery or Open
DTC B2440 02
- Right Seat Back Heater Sensor Circuit Short to Ground
DTC B2440 05
- Right Seat Back Heater Sensor Circuit Short to Battery or Open
Diagnostic Fault Information
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 10 X4 and the low reference circuit terminal 7 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
瀚慖f greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the HSM.
6. If all circuits test normal, replace the HSM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater
Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the HSM replacement, setup, and programming
B2440
DTC B2435 or B2440 (HP2 or Dealer Installed w/o Memory)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B2435 02
- Left Seat Back Heater Sensor Circuit Short to Ground
DTC B2435 05
- Left Seat Back Heater Sensor Circuit Short to Battery or Open
DTC B2440 02
- Right Seat Back Heater Sensor Circuit Short to Ground
DTC B2440 05
- Right Seat Back Heater Sensor Circuit Short to Battery or Open
Diagnostic Fault Information
2010 Cadillac Truck Escalade AWD V8-6.2L Page 463
2010 Cadillac Truck Escalade AWD V8-6.2L Page 463
锟斤拷If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
6. If all circuits test normal, test or replace the headlamp and panel dimmer switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Headlamp Switch Replacement (Cadillac) (See: Lighting and Horns/Headlamp/Headlamp Switch/Service and Repair/Headlamp Switch
Replacement (Cadillac))Headlamp Switch Replacement (Except Cadillac) (See: Lighting and Horns/Headlamp/Headlamp Switch/Service
and Repair/Headlamp Switch Replacement (Except Cadillac))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
Power Seats
DTC B1395
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1395 02
- Device Voltage Reference Output Circuit Short to Ground
DTC B1395 05
- Device Voltage Reference Output Circuit Short to Battery or Open
Diagnostic Fault Information
锟斤拷If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
6. If all circuits test normal, test or replace the headlamp and panel dimmer switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Headlamp Switch Replacement (Cadillac) (See: Lighting and Horns/Headlamp/Headlamp Switch/Service and Repair/Headlamp Switch
Replacement (Cadillac))Headlamp Switch Replacement (Except Cadillac) (See: Lighting and Horns/Headlamp/Headlamp Switch/Service
and Repair/Headlamp Switch Replacement (Except Cadillac))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
Power Seats
DTC B1395
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC B1395 02
- Device Voltage Reference Output Circuit Short to Ground
DTC B1395 05
- Device Voltage Reference Output Circuit Short to Battery or Open
Diagnostic Fault Information
2010 Cadillac Truck Escalade AWD V8-6.2L Page 462
2010 Cadillac Truck Escalade AWD V8-6.2L Page 462
Conditions for Setting the DTC
B1395 03
The BCM detects a voltage that is lower than 0.33 V on the I/P dimming voltage reference circuit.
B1395 07
The BCM detects a voltage that is greater than 4.97 V on I/P dimming voltage reference circuit.
Action Taken When the DTC Sets
* The I/P lamps are dim or not illuminated.
* The I/P lamps will not dim.
* The stop lamps are always ON.
Conditions for Clearing the DTC
* The conditions for setting the DTC are no longer present.
* A history DTC clears after 100 malfunction-free ignition cycles.
* The BCM receives the clear code command from the scan tool.
Reference Information
Schematic Reference
* Interior Lights Dimming Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Dimming
Schematics)
* Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems Description
and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the headlamp and panel dimmer switch.
2. Ignition OFF, verify that a test lamp illuminates between the ground circuit terminal 8 and B+.
锟斤拷If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Dimming Control Signal parameter is less than 0.1 V.
锟斤拷If greater than the specified range, test the signal circuit terminal 13 for a short to voltage. If the circuit tests normal, replace the BCM.
4. Ignition ON, test for 12 V between the I/P dimming voltage reference circuit terminal 15 and ground.
锟斤拷If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests
normal, replace the BCM.
5. Install a 3 A fused jumper wire between the signal circuit terminal 13 and the voltage reference circuit terminal 15. Verify the scan tool BCM
Dimming Control Signal parameter is greater than 2.6 V.
Conditions for Setting the DTC
B1395 03
The BCM detects a voltage that is lower than 0.33 V on the I/P dimming voltage reference circuit.
B1395 07
The BCM detects a voltage that is greater than 4.97 V on I/P dimming voltage reference circuit.
Action Taken When the DTC Sets
* The I/P lamps are dim or not illuminated.
* The I/P lamps will not dim.
* The stop lamps are always ON.
Conditions for Clearing the DTC
* The conditions for setting the DTC are no longer present.
* A history DTC clears after 100 malfunction-free ignition cycles.
* The BCM receives the clear code command from the scan tool.
Reference Information
Schematic Reference
* Interior Lights Dimming Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Dimming
Schematics)
* Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems Description
and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the headlamp and panel dimmer switch.
2. Ignition OFF, verify that a test lamp illuminates between the ground circuit terminal 8 and B+.
锟斤拷If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Dimming Control Signal parameter is less than 0.1 V.
锟斤拷If greater than the specified range, test the signal circuit terminal 13 for a short to voltage. If the circuit tests normal, replace the BCM.
4. Ignition ON, test for 12 V between the I/P dimming voltage reference circuit terminal 15 and ground.
锟斤拷If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests
normal, replace the BCM.
5. Install a 3 A fused jumper wire between the signal circuit terminal 13 and the voltage reference circuit terminal 15. Verify the scan tool BCM
Dimming Control Signal parameter is greater than 2.6 V.
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2010 Cadillac Truck Escalade AWD V8-6.2L Page 461
DTC Descriptors
DTC B1395 03
- Device Voltage Reference Output 1 Circuit Voltage Below Threshold
DTC B1395 07
- Device Voltage Reference Output 1 Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
Voltage for the interior backlighting components and stop lamp switch activation signal is supplied from the body control module (BCM). The
BCM applies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimming switch, which is
part of the headlamp switch. When the dimming switch is placed in the desired position, the dimmed voltage setting is applied from the interior
lamp dimming switch through the I/P dimming control circuit to the BCM. The BCM then applies the dimmed voltage to the I/P lamps supply
voltage circuit and they dim to the correct level.
The stop lamp switch is also supplied voltage on the same circuit for a stop lamp OFF signal to the BCM. When the stop lamp switch is activated
the voltage signal circuit to the BCM is opened prompting the BCM to illuminate the stop lamps.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Ignition must be ON.
DTC Descriptors
DTC B1395 03
- Device Voltage Reference Output 1 Circuit Voltage Below Threshold
DTC B1395 07
- Device Voltage Reference Output 1 Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
Voltage for the interior backlighting components and stop lamp switch activation signal is supplied from the body control module (BCM). The
BCM applies a voltage reference through the instrument panel (I/P) dimming voltage reference circuit to the interior lamp dimming switch, which is
part of the headlamp switch. When the dimming switch is placed in the desired position, the dimmed voltage setting is applied from the interior
lamp dimming switch through the I/P dimming control circuit to the BCM. The BCM then applies the dimmed voltage to the I/P lamps supply
voltage circuit and they dim to the correct level.
The stop lamp switch is also supplied voltage on the same circuit for a stop lamp OFF signal to the BCM. When the stop lamp switch is activated
the voltage signal circuit to the BCM is opened prompting the BCM to illuminate the stop lamps.
Conditions for Running the DTC
* Battery voltage must be between 9-16 V.
* Ignition must be ON.
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2010 Cadillac Truck Escalade AWD V8-6.2L Page 460
Note: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
4. Perform the ignition switch component test. The test should pass.
锟斤拷If the ignition switch fails, replace the ignition switch.
5. Ignition OFF, disconnect the X 1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the
BCM and ground.
* Ignition key resistor signal terminal 4
* Off/Run/Crank voltage terminal 2
* Accessory voltage terminal 21
* Ignition 1 voltage terminal 14
锟斤拷If greater than specified, test the circuit for a short to voltage.
6. Test for less than 1.0 ohm of resistance between the BCM and the ignition switch on the following circuit terminals.
* Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 6
* Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5
* Accessory voltage, BCM terminal 21 and ignition switch terminal 3
* Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 2
锟斤拷If greater than specified, repair the circuit for open/high resistance
7. Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
锟斤拷If less than specified, repair the signal circuit for a short to ground.
8. If all circuits test normal, replace the BCM.
Component Testing
Ignition Switch
1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Using the Resistance Test table below, check the resistance between the terminals of the ignition switch listed in each switch position.
If any reading is not as specified, replace the ignition switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
* Ignition and Start Switch Replacement (See: Powertrain Management/Ignition System/Sensors and Switches - Ignition System/Ignition
Switch/Service and Repair)
Lighting
DTC B1395
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
Note: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
4. Perform the ignition switch component test. The test should pass.
锟斤拷If the ignition switch fails, replace the ignition switch.
5. Ignition OFF, disconnect the X 1 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the
BCM and ground.
* Ignition key resistor signal terminal 4
* Off/Run/Crank voltage terminal 2
* Accessory voltage terminal 21
* Ignition 1 voltage terminal 14
锟斤拷If greater than specified, test the circuit for a short to voltage.
6. Test for less than 1.0 ohm of resistance between the BCM and the ignition switch on the following circuit terminals.
* Ignition key resistor signal, BCM terminal 4 and ignition switch terminal 6
* Off/Run/Crank voltage, BCM terminal 2 and ignition switch terminal 5
* Accessory voltage, BCM terminal 21 and ignition switch terminal 3
* Ignition 1 voltage, BCM terminal 14 and ignition switch terminal 2
锟斤拷If greater than specified, repair the circuit for open/high resistance
7. Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
锟斤拷If less than specified, repair the signal circuit for a short to ground.
8. If all circuits test normal, replace the BCM.
Component Testing
Ignition Switch
1. Ignition OFF, disconnect the harness connector at the ignition switch.
2. Using the Resistance Test table below, check the resistance between the terminals of the ignition switch listed in each switch position.
If any reading is not as specified, replace the ignition switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
* Ignition and Start Switch Replacement (See: Powertrain Management/Ignition System/Sensors and Switches - Ignition System/Ignition
Switch/Service and Repair)
Lighting
DTC B1395
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 580
2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 580
B2435 05 or B2440 05
The temperature sensor voltage is greater than 5 V for more than 1 second.
Action Taken When the DTC Sets
The heated seat back function for the affected seat will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range, and the ignition is cycled OFF then back
to ACC or RUN.
* A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs function.
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Verify the type of vehicle and the heated seat system for which the DTC set.
If the DTC set in a hybrid or a non-hybrid vehicle without memory, refer to Circuit/System Testing below.
If the DTC set in a vehicle equipped with memory, refer to DTC B2435 or B2440 (w/o HP2 with memory).
Circuit/System Testing
B2435 02 or B2435 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 19 X4 and the low reference circuit terminal 5 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
瀚慖f greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the HSM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
6. If all circuits test normal, replace the HSM.
B2440 02 or B2440 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
B2435 05 or B2440 05
The temperature sensor voltage is greater than 5 V for more than 1 second.
Action Taken When the DTC Sets
The heated seat back function for the affected seat will be disabled.
Conditions for Clearing the DTC
* The current DTC will clear 3 seconds after the reference voltage returns to normal operating range, and the ignition is cycled OFF then back
to ACC or RUN.
* A history DTC will clear after 50 ignition cycles or with a scan tool using the clear DTCs function.
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Verify the type of vehicle and the heated seat system for which the DTC set.
If the DTC set in a hybrid or a non-hybrid vehicle without memory, refer to Circuit/System Testing below.
If the DTC set in a vehicle equipped with memory, refer to DTC B2435 or B2440 (w/o HP2 with memory).
Circuit/System Testing
B2435 02 or B2435 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 19 X4 and the low reference circuit terminal 5 X2.
瀚慖f less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat
back heater element/temperature sensor.
瀚慖f greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits
test normal, replace the seat back heater element/temperature sensor.
3. Connect the X2, X4 harness connectors at the HSM.
4. Disconnect the harness connector at the seat back heater element/temperature sensor.
5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the HSM.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
6. If all circuits test normal, replace the HSM.
B2440 02 or B2440 05
1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
2010 Cadillac Truck Escalade AWD V8-6.2L Page 46
2010 Cadillac Truck Escalade AWD V8-6.2L Page 46
P0690 - P0711
P0690 - P0711
2010 Cadillac Truck Escalade AWD V8-6.2L Page 459
2010 Cadillac Truck Escalade AWD V8-6.2L Page 459
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify that the following DTCs are not set: U1814, B1428.
锟斤拷If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding
ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in
correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.
Circuit/System Testing
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Inspect for an B+ fuse to the ignition switch. The fuse should be OK.
锟斤拷If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
* B+
* Accessory voltage
* Off/Run/Crank voltage
* Ignition 1 voltage
* Accessory wakeup serial data (BCM output)
* Run/crank ignition 1 voltage (BCM output)
2. Disconnect the harness connector at the ignition switch.
3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
锟斤拷If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
Reference Information
Schematic Reference
* Body Control System Schematics (See: Body and Frame/Body Control Systems/Diagrams/Electrical Diagrams)
* Power Distribution Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System
Diagram/Power Distribution Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Power Mode Description and Operation (See: Power and Ground Distribution/Description and Operation/Power Mode Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify that the following DTCs are not set: U1814, B1428.
锟斤拷If either of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code
Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. With a scan tool, access Body Control Module, Power Mode data display list and compare all parameters listed with the corresponding
ignition key position. The PMM Power Mode Parameters table below illustrates the correct state of these input parameters (circuits) in
correspondence to the ignition switch position. The circuits which the individual parameters are related to are in parentheses.
Circuit/System Testing
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Inspect for an B+ fuse to the ignition switch. The fuse should be OK.
锟斤拷If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
* B+
* Accessory voltage
* Off/Run/Crank voltage
* Ignition 1 voltage
* Accessory wakeup serial data (BCM output)
* Run/crank ignition 1 voltage (BCM output)
2. Disconnect the harness connector at the ignition switch.
3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
锟斤拷If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
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2010 Cadillac Truck Escalade AWD V8-6.2L Page 458
Circuit/System Description
This vehicles power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete
ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a
reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can
allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other
modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this
information to identify the operators desired power mode and activate specific discrete signals, and serial data messages for the operation of many
different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data
message does not match what the individual module can see from its own connections.
The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Several relays controlled by
the BCM are switched ignition voltage outputs the are pass through circuits within the BCM directly from the ignition switch. If these circuits short
to ground, the fuse to the ignition switch will open.
Conditions for Running the DTC
B1380 01
Ignition switch is in the START position.
B1380 06
Ignition switch is in the RUN position.
Conditions for Setting the DTC
B1380 01
Accessory voltage circuit is shorted to voltage for more than 2 seconds.
B1380 06
* Accessory voltage circuit is open for more than 2 seconds.
* Ignition 1 voltage, accessory voltage, or off/run/crank voltage circuit shorted to ground.
* Battery positive voltage circuit of the ignition switch open or shorted to ground.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Diagnostic Aids
* A short to ground in the accessory wakeup serial data circuit will cause an open fuse to the ignition switch. DTC U1814 should be current.
* A short to ground in the run/crank ignition 1 voltage circuit of the run crank relay will cause an open fuse to the ignition switch. DTC B1428
should be current.
* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters
listed in Circuit/System Verification will determine if there is a power mode fault.
Circuit/System Description
This vehicles power mode master (PMM) is the body control module (BCM). The ignition switch is a low current switch with multiple discrete
ignition switch signals to the PMM for determination of the power mode. The PMM receives the ignition switch signals, and additionally a
reference voltage signal from the BCM, through the ignition switch, and back to the BCM. There are redundancies within the PMM system that can
allow operation of certain subsystems when there are faults in the ignition switch circuits. Other information such as serial data input from other
modules and DTCs is also used to determine what power mode signals and information is transmitted by the PMM. The BCM logic uses all this
information to identify the operators desired power mode and activate specific discrete signals, and serial data messages for the operation of many
different subsystems as necessary. Other modules which have switched voltage inputs may operate in a default mode if the PMM serial data
message does not match what the individual module can see from its own connections.
The PMM will activate relays and other direct outputs of the PMM as needed according to the calculated power mode. Several relays controlled by
the BCM are switched ignition voltage outputs the are pass through circuits within the BCM directly from the ignition switch. If these circuits short
to ground, the fuse to the ignition switch will open.
Conditions for Running the DTC
B1380 01
Ignition switch is in the START position.
B1380 06
Ignition switch is in the RUN position.
Conditions for Setting the DTC
B1380 01
Accessory voltage circuit is shorted to voltage for more than 2 seconds.
B1380 06
* Accessory voltage circuit is open for more than 2 seconds.
* Ignition 1 voltage, accessory voltage, or off/run/crank voltage circuit shorted to ground.
* Battery positive voltage circuit of the ignition switch open or shorted to ground.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Diagnostic Aids
* A short to ground in the accessory wakeup serial data circuit will cause an open fuse to the ignition switch. DTC U1814 should be current.
* A short to ground in the run/crank ignition 1 voltage circuit of the run crank relay will cause an open fuse to the ignition switch. DTC B1428
should be current.
* The power modes and controls are determined using BCM logic. Comparing the Body Control Module Power Mode data display parameters
listed in Circuit/System Verification will determine if there is a power mode fault.
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