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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 30
DTC B0019 04
- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Open Circuit
DTC B0019 0D
- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Resistance Above Threshold
DTC B0019 0E
- Passenger Instrument Panel Air Bag Deployment Loop Stage 1 Resistance Below Threshold
DTC B0020 01
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Short to Battery
DTC B0020 02
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Short to Ground
DTC B0020 04
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Open Circuit
DTC B0020 0D
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Resistance Above Threshold
DTC B0020 0E
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Resistance Below Threshold
DTC B0021 01
- Passenger Side Seat Air Bag Deployment Loop Short to Battery
DTC B0021 02
- Passenger Side Seat Air Bag Deployment Loop Short to Ground
DTC B0021 04
- Passenger Side Seat Air Bag Deployment Loop Open Circuit
DTC B0021 0D
- Passenger Side Seat Air Bag Deployment Loop Resistance Above Threshold
DTC B0021 0E
- Passenger Side Seat Air Bag Deployment Loop Resistance Below Threshold
DTC B0022 01
- RF Pretensioner Deployment Loop Short to Battery
DTC B0022 02
- Passenger Seat Belt Retractor Pretensioner Deployment Loop Short to Ground
DTC B0022 04
- Passenger Seat Belt Retractor Pretensioner Deployment Loop Open Circuit
DTC B0022 0D
- Passenger Seat Belt Retractor Pretensioner Deployment Loop Resistance Above Threshold
DTC B0022 0E
- Passenger Seat Belt Retractor Pretensioner Deployment Loop Resistance Below Threshold
DTC B0023 01
- Right Roof Rail Air Bag Deployment Loop Short to Battery
DTC B0023 02
- Right Roof Rail Air Bag Deployment Loop Short to Ground
DTC B0023 04
- Right Roof Rail Air Bag Deployment Loop Open Circuit
DTC B0023 0D
- Right Roof Rail Air Bag Deployment Loop Resistance Above Threshold
DTC B0023 0E
- Right Roof Rail Air Bag Deployment Loop Resistance Below Threshold
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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 394
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.
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)
Saturday, June 29, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 224
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, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be between
3 and 253 counts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate actuator.
2. Test for less than 1 ohm between the low reference circuit terminal 7 and ground.
锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.
锟斤拷 If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.
锟斤拷 If greater than the specified range, test the 5-volt reference circuit for a short to voltage.
4. Verify the appropriate scan tool parameter is less than 4 counts.
锟斤拷 If greater than the specified range, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the HVAC
control module.
5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan tool
parameter is greater than 250 counts.
锟斤拷 If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
锟斤拷 If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the
appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in
the other direction and 2.5 volts in the at rest state.
锟斤拷 If the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the
HVAC control module.
8. If all circuits test normal, replace the actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Mode Valve Actuator Replacement)
* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)
* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)
* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service
and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve Actuator
Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -
Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))
* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and
Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (See:
Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator
Replacement (Delphi))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for HVAC control module replacement, setup, and
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 586
3. Verify that a test lamp illuminates between the B+ circuit terminal 86 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. If the circuit tests normal and the
B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the fog lamp
relay.
4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
锟斤拷 If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
5. Disconnect the harness connector at the appropriate park lamp.
6. Test for less than 5 ohm between the park lamp ground circuit terminal and ground.
锟斤拷 If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the park lamp.
8. Connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the park lamp is activated.
锟斤拷 If the park lamp does not activate and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal,
test or replace the park lamp.
锟斤拷 If the park lamp does not activate and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or
replace the park lamp.
9. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
10. Command the Parking Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded
states.
锟斤拷 If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
锟斤拷 If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace
the BCM.
11. If all circuits test normal, test or replace the park lamp relay.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay
Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power
Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))
* Headlamp Replacement (Cadillac Escalade) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp
Replacement (Cadillac Escalade))Headlamp Replacement (GMC Yukon Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service
and Repair/Removal and Replacement/Headlamp Replacement (GMC Yukon Two-mode Hybrid))Headlamp Replacement (Yukon) (See:
Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Yukon))Headlamp Replacement
(Chevrolet Tahoe Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp
Replacement (Chevrolet Tahoe Two-mode Hybrid))Headlamp Replacement (Tahoe, Avalanche) (See: Lighting and Horns/Headlamp/Service
and Repair/Removal and Replacement/Headlamp Replacement (Tahoe, Avalanche))Headlamp Replacement (Escalade PLATINUM) (See:
Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Escalade Platinum))Headlamp
Replacement (Non HID) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Non
HID))
* Repeater Lamp Replacement (Escalade) (See: Lighting and Horns/Turn Signals/Turn Signal Lamp/Service and Repair/Repeater Lamp
Replacement (Escalade))
* Front Side Marker Lamp Replacement (Yukon) (See: Lighting and Horns/Marker Lamp/Service and Repair/Front Side Marker Lamp
Replacement (Yukon))Front Side Marker Lamp Replacement (Tahoe, Avalanche) (See: Lighting and Horns/Marker Lamp/Service and
Repair/Front Side Marker Lamp Replacement (Tahoe, Avalanche))
* Parking and Turn Signal Lamp Replacement (Tahoe, Avalanche) (See: Lighting and Horns/Parking Lamp/Service and Repair/Parking and
Turn Signal Lamp Replacement (Tahoe, Avalanche))Parking and Turn Signal Lamp Replacement (Yukon) (See: Lighting and Horns/Parking
Lamp/Service and Repair/Parking and Turn Signal Lamp Replacement (Yukon))
* Tail Lamp Replacement (Avalanche) (See: Lighting and Horns/Tail Lamp/Service and Repair/Tail Lamp Replacement (Avalanche))Tail
Lamp Replacement (GMC Yukon Two-Mode Hybrid) (See: Lighting and Horns/Brake Lamp/Brake Light Bulb/Service and Repair/Tail
Lamp Replacement (GMC Yukon Two-Mode Hybrid))Tail Lamp Replacement (Chevrolet Tahoe Two-Mode Hybrid) (See: Lighting and
Horns/Brake Lamp/Brake Light Bulb/Service and Repair/Tail Lamp Replacement (Chevrolet Tahoe Two-Mode Hybrid))Tail Lamp
Replacement (Cadillac) (See: Lighting and Horns/Tail Lamp/Service and Repair/Tail Lamp Replacement (Cadillac))Tail Lamp Replacement
(Tahoe, Yukon) (See: Lighting and Horns/Brake Lamp/Brake Light Bulb/Service and Repair/Tail Lamp Replacement (Tahoe/Yukon))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 437
* Power Seat Switch Replacement (with HP2) ()Power Seat Switch Replacement (without HP2) ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming
B1760
DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820
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 B1735 01
- Seat Front Up Switch Circuit Short to Battery
DTC B1740 01
- Seat Front Down Switch Circuit Short to Battery
DTC B1745 01
- Seat Rear Up Switch Circuit Short to Battery
DTC B1750 01
- Seat Rear Down Switch Circuit Short to Battery
DTC B1755 01
- Seat Assembly Forward Switch Circuit Short to Battery
DTC B1760 01
- Seat Assembly Rearward Switch Circuit Short to Battery
DTC B1815 01
- Seat Recline Forward Switch Circuit Short to Battery
DTC B1820 01
- Seat Recline Rearward Switch Circuit Short to Battery
Diagnostic Fault Information
Friday, June 28, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 392
* 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.
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.
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 89
Circuit/System Description
The Assist Step Control Module controls the running board actuators to extend or retract the running boards. Each actuator consists of an
electric motor and a potentiometer. The module supplies a low reference and 10-volt reference source voltage to the potentiometer. The Assist
Step Control Module monitors the voltage drop across the potentiometer on the position signal circuit. When the actuator shaft rotates, the
voltage on the position signal circuit changes. The Assist Step Control Module supplies the actuator motor with a 12-volt control circuit and a
ground control circuit. The assist step module controls the direction of the actuator by changing the polarity of the control circuits.
Conditions for Running the DTC
Thursday, June 27, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 647
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 center high mounted stop lamp.
2. Test for less than 5.0 ohm between the ground circuit terminal B and ground.
锟斤拷 If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal A and the ground circuit terminal B.
4. Ignition ON, turn the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when
changing between the selected states.
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.
锟斤拷 If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the BCM.
5. If all circuits test normal, replace the center high mounted stop lamp.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Tail Lamp Bulb Replacement (Yukon) (See: Lighting and Horns/Tail Lamp/Tail Light Bulb/Service and Repair/Tail Lamp Bulb
Replacement (Yukon))Tail Lamp Bulb Replacement (Cadillac) (See: Lighting and Horns/Tail Lamp/Tail Light Bulb/Service and Repair/Tail
Lamp Bulb Replacement (Cadillac))Tail Lamp Bulb Replacement (Tahoe, Avalanche) (See: Lighting and Horns/Tail Lamp/Tail Light
Bulb/Service and Repair/Tail Lamp Bulb Replacement (Tahoe, Avalanche))Tail Lamp Bulb Replacement (Tahoe) (See: Lighting and
Horns/Brake Lamp/Brake Light Bulb/Service and Repair/Tail Lamp Bulb Replacement (Tahoe))Tail Lamp Bulb Replacement (Yukon
Two-mode Hybrid) (See: Lighting and Horns/Brake Lamp/Brake Light Bulb/Service and Repair/Tail Lamp Bulb Replacement (Yukon
Two-mode Hybrid))
* High Mount Stop Lamp Replacement (Yukon Two-mode Hybrid) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and
Repair/High Mount Stop Lamp Replacement (Yukon Two-mode Hybrid))High Mount Stop Lamp Replacement (Yukon) (See: Lighting and
Horns/Center Mounted Brake Lamp/Service and Repair/High Mount Stop Lamp Replacement (Yukon))High Mount Stop Lamp Replacement
(Avalanche) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair/High Mount Stop Lamp Replacement (Avalanche)
)High Mount Stop Lamp Replacement (Escalade) (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair/High Mount
Stop Lamp Replacement (Escalade))
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
B3567
DTC B3567
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 B3567 01
- Driver Information Center (DIC) Select Switch Circuit Short To Battery
DTC B3567 59
- Driver Information Center (DIC) Select Switch Circuit/Component Protection Time-Out
Diagnostic Fault Information
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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 39
Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of
the affected component/connector.
* Seat belt pretensioner
* Passenger instrument panel airbag
* Side air bag
* Roof rail airbag
* SDM
* SDM wiring harness connector
Note: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an
audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the
high resistance condition due to terminal fretting corrosion.
Observe the scan tool Deployment Loop Resistance parameters while moving the harness near each connector listed below. The reading should stay
consistently between 1.7 and 4.2 ohm without any drop outs or spikes.
* Passenger instrument panel air bag
* Roof rail air bag
* Seat side air bag
* Seat belt pretensioner
* Any inline harness
* SDM
If the reading is erratic while moving the harness, perform the following;
* Inspect each connector terminal for damage or corrosion and repair as necessary.
* Apply Nyogel lubricant 760G to each connector terminal.
* Insure each connector and CPA is correctly seated.
Circuit/System Testing
DTC B0014-B0018 or B0021-B0045
1. Ignition OFF, disconnect the scan tool and disconnect the harness connector at the appropriate air bag or seat belt retractor pretensioner.
2. With the appropriate load tool adaptor, connect special tool J 38715-A in place of the air bag or seat belt retractor pretensioner.
3. Wait for 120 seconds and then test for greater than 25 ohm between the control circuit terminals listed below.
* Left roof rail air bag terminal 1 and 2
* Right roof rail air bag terminal 1 and 2
* Driver seat side air bag terminal 1 and 2
* Passenger seat side air bag terminal 1 and 2
* Driver seat belt retractor pretensioner terminal 1 and 2
* Passenger seat belt retractor pretensioner terminal 1 and 2
锟斤拷 If less than the specified range, test for a short between the control circuits, check each connector and CPA to ensure that the shorting bars
are lifted. If the circuits and shorting bars tests normal, replace the SDM.
4. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground:
* Roof rail air bag control circuit terminal 1
* Roof rail air bag control circuit terminal 2
* Seat side air bag control circuit terminal 1
* Seat side air bag control circuit terminal 2
* Retractor pretensioner control circuit terminal 1
* Retractor pretensioner control circuit terminal 2
锟斤拷 If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the SDM.
5. Ignition OFF, test for greater than 25 ohm between the control circuit terminals listed below and ground:
* Roof rail air bag control circuit terminal 1
* Roof rail air bag control circuit terminal 2
* Seat side air bag control circuit terminal 1
* Seat side air bag control circuit terminal 2
* Retractor pretensioner control circuit terminal 1
* Retractor pretensioner control circuit terminal 2
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 149
SIR Schematics (See: Diagrams/Electrical Diagrams/Air Bag Systems)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
SIR System Description and Operation (See: Restraints and Safety Systems/Air Bag 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)
* 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)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* 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
Important: Refer to SIR Service Precautions (See: Restraints and Safety Systems/Air Bag Systems/Service Precautions/Technician Safety
Information).
When removing connectors, inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of
the affected component/connector:
* Front end sensor
* SDM module
* Front end sensor wiring harness connector
* SDM wiring harness connector
1. Ignition OFF, disconnect the harness connector at the appropriate sensor.
2. Disconnect the harness connector at the SDM.
3. Ignition ON, test for less than 1 volt between the following signal circuit and ground.
* Right front end sensor terminal 1
* Left front end sensor terminal 1
* Right front side impact sensor terminal B
* Left front side impact sensor terminal B
* Right rear side impact sensor terminal B
* Left rear side impact sensor terminal B
锟斤拷 If greater than the specified range, test the circuit for a short to voltage.
4. Ignition ON, test for less than 1 volt between the low reference circuit and ground.
* Right front end sensor terminal 2
* Left front end sensor terminal 2
* Right front side impact sensor terminal A
* Left front side impact sensor terminal A
* Right rear side impact sensor terminal A
* Left rear side impact sensor terminal A
锟斤拷 If greater than the specified range, test the circuit for a short to voltage.
5. Test for infinite resistance between the signal circuit and ground.
* Right front end sensor terminal 1
* Left front end sensor terminal 1
* Right front side impact sensor terminal B
* Left front side impact sensor terminal B
* Right rear side impact sensor terminal B
Wednesday, June 26, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 18
DTC B0023 04
- Right Roof Rail Air Bag Deployment Loop Open Circuit
DTC B0023 0D
- Right Roof Rail Air Bag Deployment Loop Resistance Above Threshold
DTC B0023 0E
- Right Roof Rail Air Bag Deployment Loop Resistance Below Threshold
Diagnostic Fault Information
Circuit/System Description
During a side or frontal crash of sufficient force the inflatable restraint sensing and diagnostic module (SDM) will allow current to flow through the
deployment loop in order to deploy the air bag module. There are 2 shorting bars used within the module connector which will short together both
high and low circuits, when the connector is disconnected. This will prevent unwanted deployment of the inflator module during servicing.
Conditions for Running the DTC
Ignition voltage is between 9-16 V.
Conditions for Setting the DTC
B0014 01, B0015 01, B0016 01, B0019 01, B0020 01, B0021 01, B0022 01, B0023 01
The air bag or seat belt retractor pretensioner high and/or low control circuit is shorted to voltage for 120 milliseconds.
B0014 02, B0015 02, B0016 02, B0019 02, B0020 02, B0021 02, B0022 02, B0023 02
The air bag or seat belt retractor pretensioner high and/or low control circuit is shorted to ground for 120 milliseconds.
B0014 04, B0015 04, B0016 04, B0019 04, B0020 04, B0021 04, B0022 04, B0023 04
The air bag or seat belt retractor pretensioner high and/or low control circuit is open for 120 milliseconds.
B0014 0D, B0015 0D, B0016 0D, B0019 0D, B0020 0D, B0021 0D, B0022 0D, B0023 0D
The air bag or seat belt retractor pretensioner deployment loop resistance is greater than 3.9 ohms for 120 milliseconds.
B0014 0E, B0015 0E, B0016 0E, B0019 0E, B0020 0E, B0021 0E, B0022 0E, B0023 0E
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Reference Information
Schematic Reference
* Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer
Schematics)
* Remote Function Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless Entry/Keyless Entry
Transmitter/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Keyless Entry System Description and Operation (Without Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and
Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (Without Accessory 2 Way Remote)
)Keyless Entry System Description and Operation (With Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and
Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (With Accessory 2 Way Remote))
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, observe the scan tool BCM Hood Open Switch and Hood Closed Switch parameters. With the hood open, the Hood Open Switch
parameter should read Active and the Hood Closed Switch parameter should read Inactive. With the hood closed, the Hood Open Switch parameter
should read Inactive and the Hood Closed Switch parameter should read Active.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the hood ajar switch.
2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal C and ground.
锟斤拷 If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, test for 11.5-12.0 volts between the signal circuit terminal A and ground.
锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
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.
4. Ignition ON, test for 11.5-12.0 volts between the signal circuit terminal B and ground.
锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
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.
5. If all circuits test normal, test or replace the hood ajar switch.
Component Testing
Hood Ajar Switch
1. Ignition OFF, disconnect the harness connector at the hood ajar switch.
2. With the switch in the hood closed position, test for infinite resistance between the ground terminal C and the signal terminal A.
锟斤拷 If not infinite, replace the hood ajar switch.
3. Test for less than 2.0 ohms between the ground terminal C and the signal terminal B.
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Tuesday, June 25, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 598
* Refer to the appropriate replacement procedure for the component causing the condition.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming
B2645
DTC B2645
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 B2645 03
- Ambient Light Sensor Circuit Voltage Below Threshold
DTC B2645 07
- Ambient Light Sensor Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit/System Description
The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary depending
on outside lighting conditions. The body control module (BCM) provides a 5 V reference signal to the ambient light sensor. The BCM monitors the
ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp
control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRLs ON. In low light
conditions, when the headlamps switch is in AUTO position, the BCM will command the low beam headlamps ON.
Conditions for Running the DTC
Battery voltage must be between 9-16 V.
Conditions for Setting the DTC
B2645 03
The BCM detects voltage is below 0.196 volt in the ambient light sensor signal circuit.
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 544
1. Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.
2. Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground.
锟斤拷 If greater than the specified range, replace the antenna coax.
3. Ignition ON, test for less than 1 volt between the antenna coax outer shield and ground.
锟斤拷 If greater than the specified range, replace the antenna coax.
4. Test for infinite resistance between the antenna coax center terminal and ground.
锟斤拷 If less than the specified value, replace the antenna coax
5. Test for infinite resistance between the antenna coax outer shield and ground.
锟斤拷 If less than the specified value, replace the antenna coax
6. Test for less than 5 ohms at the cellular antenna coax center terminal from end to end.
锟斤拷 If greater than specified value, replace the cellular antenna coax cable.
7. Test for less than 5 ohms at the cellular antenna coax outer shield from end to end.
锟斤拷 If greater than specified value, replace the cellular antenna coax cable.
8. Test for infinite resistance between the antenna coax center terminal and the outer shield.
锟斤拷 If less than specified value, replace the cellular antenna coax cable.
9. If coax cable tests normal, replace the cellular antenna.
10. Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC B2470 does not set.
锟斤拷 If the DTC sets, replace the CIM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Cellular Communications/Digital Radio Antenna Replacement (See: Accessories and Optional Equipment/Antenna/Antenna, Radio/Service
and Repair/Cellular Communications/Digital Radio Antenna Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for CIM replacement, setup, and programming
B2474
DTC B2474
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 B2474 07
- Navigation Display Head Backlighting Performance
Circuit Description
The internal backlighting of the navigation display screen located in the navigation radio.
Conditions for Running the DTC
* Radio ON.
* Battery voltage must be between 9-16 volts.
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Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify that DTC B1405 is not set.
锟斤拷 If DTC is set, refer to DTC B1405 (See: B1405).
2. Verify that DTC B0958 3A, DTC B0959 3A, DTC B0960 3A, or DTC B0961 3A is not set.
锟斤拷 If DTC is set, replace the appropriate object alarm sensor.
3. Transmission in REVERSE, verify the parking assist system is enabled and one audible beep sounds.
Circuit/System Testing
Single Object Alarm Sensor DTC Set
1. Ignition OFF, disconnect the harness connector at the appropriate object alarm sensor.
2. Ignition OFF for 30 seconds, test for less than 20 Ohms between the low reference circuit terminal 2 and ground.
锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the object
alarm module.
3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 V between the voltage reference circuit terminal 1 and ground.
锟斤拷 If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the object
alarm module.
锟斤拷 If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the object alarm module.
4. Ignition OFF, remove the malfunctioning object alarm sensor and swap locations with another properly functioning object alarm sensor.
Connect the harness connector at both sensors.
5. Ignition ON, verify the DTC is set for the new location in which the malfunctioning object alarm sensor is installed.
锟斤拷 If the DTC does not set for the new location, test the signal circuit terminal 3 for a short to voltage, short to ground, or an open/high
resistance. If the circuit tests normal, replace the object alarm module.
6. If the DTC sets for the new location in which the malfunctioning object alarm sensor is installed, replace the appropriate object alarm sensor.
Multiple Object Alarm Sensor DTCs Set
1. Ignition OFF, disconnect the harness connector at each of the object alarm sensors.
2. Ignition OFF for 30 seconds, test for less than 20 Ohms between the low reference circuit terminal 2 and ground.
锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the object
alarm module.
3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 V between the voltage reference circuit terminal 1 and ground.
锟斤拷 If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the object
alarm module.
锟斤拷 If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,
replace the 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)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for object alarm module replacement, setup, and
programming
B0961
DTC B0958, B0959, B0960, or B0961
Diagnostic Instructions
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 504
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 6 and ground.
锟斤拷 If less than the specified range, test the 5-volt 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-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
4. Verify the appropriate scan tool driver seat sensor parameter is less than 1 volt.
锟斤拷 If greater than the specified range, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace
the MSM.
* Seat front vertical position sensor terminal 1
* Seat rear vertical position sensor terminal 5
* Seat horizontal position sensor terminal 3
5. Install a 3A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal 6. Verify the
appropriate scan tool driver seat position sensor parameter is greater than 4.75 volts.
* Seat horizontal position sensor terminal 3
* Seat front vertical position sensor terminal 1
* Seat rear vertical position sensor terminal 5
锟斤拷 If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the
MSM.
6. If all circuits test normal, test or replace the seat position sensor.
B1850 01, B1850 06, B1860 01 or B1860 06
1. Ignition OFF, disconnect the X2 harness connector at the lumbar adjuster assembly.
2. Test for less than 2 ohms between the low reference circuit terminal C and ground.
锟斤拷 If greater than the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.
3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A and ground.
锟斤拷 If less than the specified range, test the 5-volt 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-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
4. Verify the appropriate scan tool lumbar sensor parameter is less than 1 volt.
锟斤拷 If greater than the specified range, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace
the MSM.
* Lumbar vertical position sensor terminal B
* Lumbar horizontal position sensor terminal D
5. Install a 3A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal A. Verify the
appropriate scan tool lumbar sensor parameter is greater than 4.75 volts.
* Lumbar vertical position sensor terminal B
* Lumbar horizontal position sensor terminal D
锟斤拷 If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the
MSM.
6. If all circuits test normal, test or replace the lumbar position sensor.
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 ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for MSM replacement, setup, and programming
Sunday, June 23, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 692
B3823
DTC B3819, B3820, B3822, or B3823
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 B3819 00
- Left Rear Window Up Control Circuit
DTC B3820 00
- Left Rear Window Down Control Circuit
DTC B3822 00
- Right Rear Window Up Control Circuit
DTC B3823 00
- Right Rear Window Down Control Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) monitors the window UP/DOWN command from the driver door switch (DDS). When the rear window UP or
DOWN command is received, the BCM sends a signal to the appropriate rear window switch. The rear window switches continuously monitor the
up and down signal circuits, if no function is being commanded, the signal voltage is at approximately B+ voltage. If the UP or DOWN function is
commanded, the BCM signal voltage drops approximately 0.5 volts and the appropriate rear window switch will then command the window in the
UP or DOWN direction.
Conditions for Running the DTC
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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 535
2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 3 X5 and the low reference circuit terminal 5 X2.
锟斤拷 If 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.
锟斤拷 If 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, X5 harness connectors at the MSM.
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.
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
MSM.
锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
6. If all circuits test normal, replace the MSM.
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 MSM replacement, setup, and programming
HP2 or Dealer Installed W/O Memory
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
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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 632
DTC B3109 00
- Keyless Entry Transmitter 1 Low Battery
DTC B3110 00
- Keyless Entry Transmitter 2 Low Battery
DTC B3111 00
- Keyless Entry Transmitter 3 Low Battery
DTC B3112 00
- Keyless Entry Transmitter 4 Low Battery
Circuit/System Description
With each press of a keyless entry transmitter button, a message containing the current battery state of the transmitter is sent to the remote control
door lock receiver (RCDLR) along with the commanded keyless entry function.
Conditions for Running the DTC
A keyless transmitter button is pressed.
Conditions for Setting the DTC
The DTC sets after 3 consecutive low battery signals from the same programmed transmitter.
Action Taken When the DTC Sets
The keyless entry system is inoperative.
Conditions for Clearing the DTC
The DTC is cleared when a normal transmitter voltage signal is received from the programmed transmitter that set the DTC.
Diagnostic Aids
The keyless entry transmitter used in the 2-Way Advanced Remote Start System is unique to the system. When servicing or replacing a transmitter,
ensure that the correct transmitter is used. The correct transmitter part number can be found in the Accessory section of the parts catalog. Attempting
to replace a 2-Way Advanced Remote Start transmitter with a regular service part may result in a failure to program the transmitter.
Reference Information
Schematic Reference
Remote Function Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless Entry/Keyless Entry
Transmitter/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Keyless Entry System Description and Operation (Without Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and
Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (Without Accessory 2 Way Remote)
)Keyless Entry System Description and Operation (With Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and
Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (With Accessory 2 Way Remote))
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
Saturday, June 22, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 197
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
The HVAC control module detects the temperature sensor signal circuit is less than -36锟斤拷C (-38锟斤拷F) or greater than 215锟斤拷C (419锟斤拷F) for greater than 15
seconds.
Action Taken When the DTC Sets
The system operates using a default value.
Conditions for Clearing the DTC
* The DTC will become history if the HVAC control module no longer detects the condition that set the DTC.
* The history DTC will clear after 100 fault-free ignition cycles.
Reference Information
Schematic Reference
HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams/HVAC - Automatic)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
* Air Temperature Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air
Temperature Description and Operation)
* Air Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air Delivery
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. Measure actual outside air temperature using a thermometer. Compare this value to the scan tool Outside Air Temp. Raw parameter. The
measured temperature should be within 5 degrees of parameter.
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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 7
The serial data gateway module has not received a valid state of health message from the high voltage circuit impact detector sensor for 2.5 seconds.
B009F 3A
The wrong high voltage circuit impact detector sensor has been installed.
B009F 4A
The serial data gateway module calibration does not match the vehicle configuration.
B009F 73
The serial data gateway module has received invalid serial data from the high voltage circuit impact detector sensor.
Action Taken When the DTC Sets
The driver information center (DIC) displays the SERVICE HYBRID SYSTEM message.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* The DIC message turns OFF when the DTC passes.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
* The high voltage circuit impact detector sensor has many different internal configurations in the same external package. Ensure that the correct
sensor part number is installed with the correct software programmed in the serial data gateway module.
* Turn the ignition OFF for 1 minute before using a scan tool to clear the DTC from the serial data gateway module. If the ignition is not OFF
for 1 minute, the DTC may not clear.
Reference Information
Schematic Reference
Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Drive Motor Generator Control Module 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 DTC B009F 00, B009F 4A, or B009F 73 is not set.
锟斤拷 If the DTC is set, program the serial data gateway module. If the DTC resets, replace the serial data gateway module.
2. Verify the serial data gateway module is programmed with the correct software calibration.
锟斤拷 If the correct software is not installed, program the serial data gateway module.
3. Ignition ON, observe the scan tool Hybrid Crash Sensor 1 parameter. The reading should be No Crash.
锟斤拷 If not No Crash, refer to Circuit/System Testing.
Friday, June 21, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 557
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Test for less than 5 ohms between the control circuit terminal 1 and ground.
锟斤拷 If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace
the LGM.
3. Test for less than 5 ohms between the control circuit terminal 3 and ground.
锟斤拷 If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace
the LGM.
4. Connect a test lamp between control circuit terminal 1 and ground.
5. Ignition ON, command the liftgate to OPEN by pressing and releasing the liftgate interior switch. The test lamp should illuminate while
commanding the OPEN state.
锟斤拷 If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the LGM.
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 LGM.
6. Ignition OFF, connect a test lamp between the control circuit terminal 3 and ground.
7. Connect a 3A fused jumper wire between the signal circuit terminal 6 and ground.
8. Ignition ON, command the liftgate to CLOSE by pressing and releasing the liftgate interior switch. The test lamp should illuminate while
commanding the CLOSE state.
锟斤拷 If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the LGM.
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 LGM.
9. If all circuits test normal, test or replace the liftgate latch assembly.
Component Testing
1. Install a 20A fused jumper wire between the control terminal 1 and 12 volts. Momentarily install a jumper wire between the control terminal 3
and ground. The liftgate latch assembly should perform the CINCH or RELEASE function.
锟斤拷 If the function does not perform as specified, replace the liftgate latch assembly.
2. Reverse the jumper wires; the liftgate latch assembly should perform the RELEASE or CINCH function.
锟斤拷 If the function does not perform as specified, replace the liftgate latch assembly.
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 LGM replacement, setup and programming
W/O HP2 With Memory
DTC B2508 or B2509 (w/o HP2 with 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 B2508 01
- Seat Heater Relay Circuit Short to Battery
DTC B2508 02
- Seat Heater Relay Circuit Short to Ground
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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 104
鈬揑f infinite resistance
4.3Test for less than 2 锟?in the 10 V reference circuits end to end.
-If 2 锟?or greater, repair the open/high resistance in the circuit.
-If less than 2 锟?replace the Assist Step Control Module.
-
If greater than 11 V
4.1Ignition OFF, disconnect the X2 harness connector at the Assist Step Control Module control module, ignition ON.
4.2Test for less than 1 V between the following 10 V reference circuit and ground.
-X2 Terminal A Running Board - Left
-X2 Terminal B Running Board - Right
-If 1 V or greater, repair the short to voltage on the appropriate circuit.
-If less than 1 V, replace the Assist Step Control Module.
锟?If between 9-11 V
5.Ignition OFF. Connect Running Board - Left actuator. Ignition ON.
6.Test for 9 - 11 V between the 10 V reference circuit terminal D at the right side and ground while commanding the actuator with the scan
tool.
-
If not between 9-11 V
Test or replace Running Board - Left actuator.
锟?If between 9-11 V
7.Ignition OFF. Disconnect Running Board - Left, connect Running Board - Right. Ignition ON.
8.Test for 9 - 11 V between the 10 V reference circuit terminal D at the left side and ground while commanding the actuator with the scan tool.
-
If not between 9-11 V
Test or replace Running Board - Right actuator.
锟?If between 9-11 V
9.Test for greater than 9 V between the appropriate signal circuit terminal E and ground while commanding the actuator with the scan tool.
-
If not greater than 9 V
9.1Ignition OFF, disconnect the X2 harness connector at the Assist Step Control Module.
9.2Test for infinite resistance between the following signal circuit terminals and ground.
-X2 Terminal C Running Board - Left
-X2 Terminal D Running Board - Right
-If less than infinite resistance, repair the short to ground on the appropriate circuit.
鈬揑f infinite resistance
9.3Test for less than 2 锟?in the signal circuits end to end.
-If 2 锟?or greater, repair the open/high resistance in the circuit.
-If less than 2 锟?replace the Assist Step Control Module.
-
If 9 V or greater
10.Connect a test lamp between the control circuit terminal A and the control circuit terminal B.
11.Verify the test lamp turns on and off while commanding the appropriate board to Extend and Retract with a scan tool.
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 382
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.
Thursday, June 20, 2019
2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 82
DTC B0020 0D
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Resistance Above Threshold
DTC B0020 0E
- Passenger Instrument Panel Air Bag Deployment Loop Stage 2 Resistance Below Threshold
DTC B0021 01
- Passenger Side Seat Air Bag Deployment Loop Short to Battery
DTC B0021 02
- Passenger Side Seat Air Bag Deployment Loop Short to Ground
DTC B0021 04
- Passenger Side Seat Air Bag Deployment Loop Open Circuit
DTC B0021 0D
- Passenger Side Seat Air Bag Deployment Loop Resistance Above Threshold
DTC B0021 0E
- Passenger Side Seat Air Bag Deployment Loop Resistance Below Threshold
DTC B0022 01
- RF Pretensioner Deployment Loop Short to Battery
DTC B0022 02
- Passenger Seat Belt Retractor Pretensioner Deployment Loop Short to Ground
DTC B0022 04
- Passenger Seat Belt Retractor Pretensioner Deployment Loop Open Circuit
DTC B0022 0D
- Passenger Seat Belt Retractor Pretensioner Deployment Loop Resistance Above Threshold
DTC B0022 0E
- Passenger Seat Belt Retractor Pretensioner Deployment Loop Resistance Below Threshold
DTC B0023 01
- Right Roof Rail Air Bag Deployment Loop Short to Battery
DTC B0023 02
- Right Roof Rail Air Bag Deployment Loop Short to Ground
DTC B0023 04
- Right Roof Rail Air Bag Deployment Loop Open Circuit
DTC B0023 0D
- Right Roof Rail Air Bag Deployment Loop Resistance Above Threshold
DTC B0023 0E
- Right Roof Rail Air Bag Deployment Loop Resistance Below Threshold
Diagnostic Fault Information
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