2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 380

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.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 314

Speakers located in the front A-pillar are connected to the same channel as the speaker in the door. A DTC will only set after the amplifier only on

up-level radios.

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)

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

Radio ON, adjust the fade and balance controls on the radio to test all four channels individually. Each of the four channels should produce clear and

even sound.

Circuit/System Testing

Important: This DTC can be set by either the radio or the amplifier. If the DTC was set by the radio, diagnose the appropriate audio output

circuits to the speakers or the low level inputs to the amplifier (if equipped). If the DTC was set by the amplifier, diagnose audio output

signals to the speakers from the amplifier. If equipped with rear seat audio (RSA) (U42), the RSA must be turned off to perform proper

speaker testing.

Without Amplifier

1. Ignition OFF, disconnect the harness connector at the appropriate speaker.

2. Radio ON, test for 5.0-7.5 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 radio.

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

radio.

3. Test for 5.0-7.5 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 radio.

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

radio.

4. If all circuits test normal, replace the speaker.

DTC Set By The Radio UQA

1. Ignition OFF, disconnect the X3 harness connector at the amplifier.

2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.

* Left front low level audio signal (+) - terminal 15

* Left front low level audio signal (-) - terminal 7

* Right front low level audio signal (+) - terminal 14

* Right front low level audio signal (-) - terminal 6

* Left rear low level audio signal (+) - terminal 13

* Left rear low level audio signal (-) - terminal 5

* Right rear low level audio signal (+) - terminal 12

* Right rear low level audio signal (-) - terminal 4

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

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 674

Conditions for Setting the DTC

If the BCM detects a short to ground in the WIPER 1 relay control circuit.

Action Taken When the DTC Sets

The BCM will not activate the output.

Conditions for Clearing the DTC

* The current DTC will become history when the request for the output is removed or when the condition for setting the fault is corrected.

* The history DTC will clear after 50 consecutive ignition cycles without a fault present.

Reference Information

Schematic Reference

Wiper/Washer Schematics (See: Wiper and Washer Systems/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Wiper/Washer System Description and Operation (See: Wiper and Washer Systems/Description and Operation/Wiper/Washer 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 Verification

Ignition ON, wiper switch in LOW position. Verify the windshield wipers are cycling at the low speed.

Circuit/System Testing

1. Ignition OFF, disconnect the X5 harness connector at the BCM.

2. Ignition ON, verify that the low speed wipers are not on.

锟斤拷 If the low speed wipers are on, test the WIPER 1 relay control circuit terminal 20 for a short to voltage. If the circuit tests normal, replace

the underhood fuse block.

3. Install a 10A fused jumper wire between the WIPER 1 relay control circuit terminal 20 and B+. Verify the low speed wipers are on.

锟斤拷 If the low speed wipers are not on, test the relay control circuit for an open/high resistance or short to ground. If the circuit tests normal

replace the underhood fuse block.

4. If all circuits test normal, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and

Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming

B3779

DTC B0228, B0413, B0423, B0433, B3779, or B3782

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 99

If the test lamp is always OFF

11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.

11.2Test for less than 1 V between the control circuit and ground.

-If 1 V or greater, repair the short to voltage on the circuit.

鈬揑f less than 1 V

11.3Ignition OFF.

11.4Test for less than 2 锟?in the control circuit 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 the test lamp is always ON

11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.

11.2Test for infinite resistance between the control circuit and ground.

-If less than infinite resistance, repair the short to ground on the circuit.

-If infinite resistance, replace the Assist Step Control Module.

锟?If the test lamp turns ON and OFF

12.Test or replace the appropriate assist step motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

- Assist Step Motor Replacement

- Control Module References for Assist Step Control Module replacement, programming and setup.

B051C

DTC B051A, B051B, B051C, or B051D

Diagnostic Instructions

-Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

-Review Strategy Based Diagnosis for an overview of the diagnostic approach.

- Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B051A 0B:Left Side Assist Step Motor Control Circuit Current Above Threshold

DTC B051A 01:Left Side Assist Step Motor Control Circuit Short to Battery

DTC B051A 02:Left Side Assist Step Motor Control Circuit Short to Ground

DTC B051A 04:Left Side Assist Step Motor Control Circuit Open Circuit

DTC B051B 0B:Right Side Assist Step Motor Control Circuit Current Above Threshold

DTC B051B 01:Right Side Assist Step Motor Control Circuit Short to Battery

DTC B051B 02:Right Side Assist Step Motor Control Circuit Short to Ground

DTC B051B 04:Right Side Assist Step Motor Control Circuit Open Circuit

DTC B051C 01:10 V Reference Circuit Short to Battery

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 293

Conditions for Setting the DTC

* The 4-digit primary data key stored in the SDM does not match the 4 digits stored in the BCM.

* The VIN stored in the BCM is not in the acceptable range of VINs allowed by the SDM calibration.

Action Taken When the DTC Sets

* The SDM requests the instrument panel cluster (IPC) to illuminate the AIR BAG indicator.

* The SDM disables all deployments.

Conditions for Clearing the DTC

* The last 4-digit Primary Data Key in the SDM match the last 4 digits stored in the BCM.

* The VIN stored in the BCM is in the acceptable range of VINs allowed by the SDM calibration.

Diagnostic Aids

This DTC is an indication that an incorrect SDM is installed in the vehicle, or that the SDM and/or the BCM was replaced without reprogramming

the BCM with the new information.

Reference Information

Schematic Reference

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)

* 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

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or

replacement of the affected.

* SDM

* SDM wiring harness

1. Ignition ON, verify the scan tool Primary Key Status displays Valid.

锟斤拷 If not the specified value, verify the scan tool SDM Primary Key matches the Received Primary Key. If the key does not match, perform

the Setup SDM Primary Key in BCM procedure.

2. Ignition ON, verify the scan tool Secondary Key Status displays Valid.

锟斤拷 If not the specified value, verify the scan tool received VIN Digits 2-7 match the vehicle VIN.

* If the VIN does not match, reprogram the BCM and perform the Setup SDM Primary Key in BCM procedure.

* If the VIN matches, reprogram the SDM, ensure the correct SDM calibration is used and perform the Setup SDM Primary Key in BCM

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 448

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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 76

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

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.

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 696

Description and Operation

Power Windows Description and Operation (See: Windows and Glass/Windows/Description and Operation/Power Windows 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

Ignition ON, command the rear windows UP and DOWN by using the window switches on the driver master control and their respective rear

window switches. The rear windows should perform the UP and DOWN function from each switch.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.

2. Ignition ON, enable the rear window switches by pressing the window lockout switch on the driver master control.

3. Test for greater than 9 volts between the control circuit terminal D and ground.

锟斤拷 If less than the specified range, 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, replace the rear window switch.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Rear Side Door Window Switch Replacement (See: Windows and Glass/Windows/Service and Repair/Rear Side Door Window Switch

Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup and programming

B3844

DTC B3844

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 B3844

- Heater Core Pump Circuit

Diagnostic Fault Information

Circuit/System Description

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 584

Diagram/Headlights/Daytime Running Lights (DRL) Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior 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 X4 harness connector at the underhood fuse block.

2. Connect a test lamp between the control circuit terminal C3 and B+.

3. Command the High Beams 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 open/high resistance. If the circuit tests normal, replace the

BCM.

4. If all circuits test normal, test or replace the underhood fuse block.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and

Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming

B2585

DTC B2585

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 B2585 00

- Park Lamp Control Circuit

Diagnostic Fault Information

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 266

- All doors closed, key OFF - indicator dimming control circuit voltage = B+ (high current - enough to light a test light).

- All doors closed, key ON, engine OFF - indicator dimming control circuit voltage = diagnostic B+.

- Key ON, engine OFF. Place a shop light on the DRL sensor. When the DRL sensor commands the headlights OFF, the indicator dimming

control circuit voltage, TCSCS X1 pin 4, will go from a diagnostic B+ to a true B+.

Reference Information

Schematic Reference

Transfer Case Control Schematics (See: Transmission and Drivetrain/Transfer Case/Diagrams/Electrical Diagrams/MP 3023/3024-NQH - Transfer

Case)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

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

Special Tools

* EL-49741 - 9 V+ Power Source Harness

* EL-49742 - Battery Voltage B+ and Ground Source Harness

* J 35616 - GM-Approved Terminal Test Kit

Circuit/System Verification

Key ON, engine OFF. The TCCM runs a 2 second bulb test on all indicators of the TCSCS at key ON.

Circuit/System Testing

Note: When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616 - GM

terminal test kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.

1. Remove key. Disconnect the X1 connector at the transfer case shift control switch (TCSCS).

2. Door open, key ON, engine OFF. Using the L-BU probe J 35616-64B, test for a diagnostic B+ (+0.0/-1.0 V) between the indicator dimming

control circuit, TCSCS X1 pin 4 and a good ground, such as the ground terminal of the EL-49742 - harness, black terminal.

锟斤拷 If the voltage is less than the specified range, test the affected circuit for an open/high resistance, short to ground or short to voltage. If all

circuits and connections test normal, test the body control module (BCM) for proper operation.

3. Using the L-BU probes J 35616-64B, test for a diagnostic B+ (+0.0/-1.0 V) between the indicator dimming control circuit, TCSCS X1 pin 4

and the 2WD HI indicator control circuit, TSCSC X1 pin 8.

锟斤拷 If the voltage is less than the specified range, test the 2WD HI indicator control circuit for an open/high resistance or short to power. If all

circuits and connections test normal, test the TCCM for proper operation.

4. Key OFF. Using the L-BU probe J 35616-64B, test for greater than 10 ohm between the indicator dimming control circuit, TCSCS X1 pin 4

and all other pins of the TCSCS X1.

锟斤拷 If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test

normal, test the TCCM for proper operation.

5. Using the L-BU probe J 35616-64B, test for greater than 10 ohm between the 2WD HI indicator control circuit, TCSCS X1 pin 8 and all other

pins of the TCSCS X1.

锟斤拷 If the resistance is less than the specified range, test the affected circuits for a shorted together condition. If all circuits and connections test

normal, test the TCCM for proper operation.

6. Test the TCSCS for proper operation.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 379

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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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 533

Circuit/System Description

The heated seat temperature sensor is located in the seat back just under the seat cover with the seat heating element. The temperature sensor is a 2

wire thermistor and resistance through the sensor varies with temperature. The signal circuit is referenced from 5 V within the memory seat module

(MSM) and the temperature of the seat surface determines the signal circuit voltage. Once the seat reaches the set temperature, the module 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 sensors.

Conditions for Running the DTC

The heated seat system must be active.

Conditions for Setting the DTC

B2435 02 or B2440 02

The temperature sensor voltage drops below 0.8 volt for more than 1 second.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 111

If the test lamp is always OFF

11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.

11.2Test for less than 1 V between the control circuit and ground.

-If 1 V or greater, repair the short to voltage on the circuit.

鈬揑f less than 1 V

11.3Ignition OFF.

11.4Test for less than 2 锟?in the control circuit 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 the test lamp is always ON

11.1Ignition OFF, disconnect the harness connector at the Assist Step Control Module.

11.2Test for infinite resistance between the control circuit and ground.

-If less than infinite resistance, repair the short to ground on the circuit.

-If infinite resistance, replace the Assist Step Control Module.

锟?If the test lamp turns ON and OFF

12.Test or replace the appropriate assist step motor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

- Assist Step Motor Replacement

- Control Module References for Assist Step Control Module replacement, programming and setup.

B0052

DTC B0052 or B0053

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 B0052 00

- Deployment Commanded

Circuit/System Description

The inflatable restraint sensing and diagnostic module (SDM) contains a device that converts vehicle velocity changes into an electrical signal. The

SDM compares this electrical signal to a value stored in memory. When the generated signal exceeds the stored value, the SDM performs additional

signal processing and compares the generated signals to values stored in memory. When 2 of the generated signals exceed the stored values, the

SDM will cause current to flow through the deployment loops, deploying the air bags and/or pretensioners causing DTC B0052 to set.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 427

Circuit Description

When the power seat switches are pressed, they send a 12-volt signal through the switch signal circuits to the memory seat module (MSM). The

MSM then commands the driver seat motors to move in response to the switch signals.

Conditions for Running the DTC

The memory seat module must be powered.

Conditions for Setting the DTC

* If a seat switch circuit is active in one direction and the switch for the opposite direction is pressed, this DTC will set.

* Multiple DTCs will set if one of the switch signal circuits is shorted to voltage.

Action Taken When the DTC Sets

* A motor output driven in response to a switch considered failed, is deactivated for both directions.

* All memory recall commands are ignored.

* The MSM will respond to any other switch signal that has not set a DTC.

Conditions for Clearing the DTC

* The current DTC will clear and set the code to history, 3 seconds after the fault is no longer present 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.

Reference Information

Schematic Reference

Driver Seat Schematics ()

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)

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 299

4. If the SDM impacts sensor and enabled deployment loops match the vehicle build and the DTC is still current, replace the K36 SDM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming

Vehicle Access

DTC B1019

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 B1019 00

- System Configuration Error

Circuit/System Description

When calibrating the liftgate position, the liftgate module (LGM) is placed in a functional state to learn the liftgate travel limits. DTC B1019 00 will

set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the travel limits are learned by the LGM, the

liftgate module will exit calibration mode and DTC B1019 00 become a history code.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

Whenever the LGM is replaced or in learn mode.

Action Taken When the DTC Sets

The power liftgate system will be disabled.

Conditions for Clearing the DTC

* The DTC will be current until the liftgate calibration procedure has been completed.

* When the calibration procedure has been completed the DTC will be a history DTC.

Diagnostic Aids

Setting B1019 00 is normal after flashing the liftgate module. This DTC will be current after flashing and the DTC will go to history after learning.

This is a normal behavior by design and is not necessary to replace the liftgate module.

Reference Information

Schematic Reference

Liftgate Schematics (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 401

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 ON, verify DTC B1475 is set as current.

锟斤拷 If DTC B1475 is not set as current, operate the vehicle within the Conditions for Setting the DTC.

Note: When cycling the ignition, keep ignition OFF for 5 seconds before checking for current DTC.

2. Disconnect each of the following components one at a time. The components may be disconnected in any order. After each component is

disconnected, cycle the ignition and verify DTC B1475 remains set as current.

* Sunroof module (with RPO CF5)

* Mobile radio relay A (with RPO 9L4)

锟斤拷 If DTC B1475 does not remain set as current, test or replace the last component that was disconnected.

3. With all components disconnected, cycle the ignition and verify DTC B1475 is not set as current.

锟斤拷 If DTC B1475 remains set as current, test the accessory voltage circuit for a short to ground. If the circuit tests normal, replace the BCM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Instrument Panel Electrical Center or Junction Block Replacement - Left Side (See: Maintenance/Fuses and Circuit Breakers/Fuse

Block/Service and Repair/Removal and Replacement/Instrument Panel Electrical Center or Junction Block Replacement - Left Side)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming

B1516

DTC B1516

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 B1516 08

- Battery Current Sensor Performance Signal Invalid

DTC B1516 66

- Battery Current Sensor Performance Wrong Mounting Position

Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 566

Circuit/System Description

The front seat heating elements are controlled by a common high current relay internal to the heated seat module (HSM) and on the low side by

individual element control circuits. The HSM connects the seat heater element supply voltage circuits to a common reference point. This reference

point is biased to approximately 2.5 V. Before the HSM will allow heated seat operation, it checks to see if the heating element supply voltage

circuits and control circuits are shorted to ground or battery voltage. Once the HSM verifies that it is not closing to a shorted heating element, it

allows heated seat operation. After which it continues to monitor for a shorted circuit.

Conditions for Running the DTC

The HSM must be powered.

Conditions for Setting the DTC

B2508 02

Before the heated seats are activated, the HSM detects a short to ground on the seat heating element supply voltage circuit or control circuit.

B2508 01

Before the heated seats are activated, the HSM detects a short to battery voltage on the seat heating element supply voltage circuit or control circuit.

Action Taken When the DTC Sets

The heated seat function for both seats will be disabled.

Conditions for Clearing the DTC

* The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to ACC or RUN.

* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 257

4. Using the L-BU probes J 35616-64B, connect a test light between the 5-volt reference circuit, TCSCS harness X1 pin 11 and a good ground.

The test light should illuminate dimly.

锟斤拷 If the test light does not illuminate, obtain a different test light and repeat step 4.

5. Key OFF. Wait 30 seconds for the TCCM to shut down.

Note: The TCCM must see the added resistance of the test light on the control circuit at key ON or the TCCM will shut the control circuit

drivers OFF. Volt meters will not work for this test.

6. Using the L-BU probes J 35616-64B, connect a test light between the TCSCS harness as specified below for the LED control circuit being

tested.

7. Key ON, engine OFF.

8. Using the Special Function ability of the scan tool, command the affected LED ON and OFF. The test light should turn OFF and ON as

commanded.

锟斤拷 If the test light remains illuminated when commanded OFF, test the affected control circuit for a short to ground. If all circuits and

connections test normal, replace the TCCM.

锟斤拷 If the test light remains OFF when commanded ON, test the affected control circuit for an open/high resistance or short to voltage. If all

circuits and connections test normal, replace the TCCM.

TCSCS

1. Using the L-BU probes J 35616-65B, connect the EL-49741 - 9 V+ power source harness to the TCSCS as specified below for the LED being

tested. Connecting the harness in the opposite pins will not illuminate the LED.

2. Connect a 9 V battery to the EL-49741 - harness.

3. Verify that only the indicator being tested illuminates.

锟斤拷 If the indicator does not illuminate when tested or the incorrect indicator illuminates, replace the TCSCS.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Transfer Case Shift Control Switch Replacement (Without SLT) (See: Powertrain Management/Transmission Control Systems/Sensors and

Switches - Transmission and Drivetrain/Sensors and Switches - Transfer Case/Four Wheel Drive Selector Switch/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for TCSCM replacement, setup, and programming

* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related Diagnostic

Procedures/MP 3023/3024-NQH - Transfer Case/Transfer Case High/Low Clutch Reset)

B0780

DTC B0780

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 B0780 01

- 4WD LO Indicator Circuit Short to Battery

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 667

2. Ignition ON, test for 11.8-12.2 volts between the appropriate 12-volt reference circuit listed below and ground:

* X88/Z88 - terminal 11

* Z75 - terminal 5

锟斤拷 If greater than the specified range, test the 12-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.

锟斤拷 If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the MSM.

3. Verify the scan tool Pedal Forward Switch parameter is Inactive.

锟斤拷 If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace

the MSM.

* X88/Z88 - terminal 12

* Z75 - terminal 6

4. Verify the scan tool Pedal Aft Switch parameter is Inactive.

锟斤拷 If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace

the MSM.

* X88/Z88 - terminal 10

* Z75 - terminal 4

5. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Forward Switch

parameter should be Active.

* X88/Z88 - terminal 12

* Z75 - terminal 6

锟斤拷 If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

MSM.

6. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Aft Switch parameter

should be Active.

* X88/Z88 - terminal 10

* Z75 - terminal 4

锟斤拷 If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

MSM.

7. If all circuits test normal, test or replace the adjustable pedal switch.

Component Testing

X88/Z88

1. Ignition OFF, disconnect the harness connector at the adjustable pedal switch.

2. Test for infinite resistance between the 12-volt reference terminal 11 and the signal terminals listed below:

* Terminal 10

* Terminal 12

锟斤拷 If not the specified value, replace the adjustable pedal switch.

3. Adjustable pedal switch in the FWD position, test for less than 2 ohms between the 12-volt reference terminal 11 and the signal terminal 12.

锟斤拷 If greater than the specified range, replace the adjustable pedal switch.

4. Adjustable pedal switch in the RWD position, test for less than 2 ohms between the 12-volt reference terminal 11 and the signal terminal 10.

锟斤拷 If greater than the specified range, replace the adjustable pedal switch.

Z75

1. Ignition OFF, disconnect the harness connector at the adjustable pedal switch.

2. Test for infinite resistance between the 12-volt reference terminal 5 and the signal terminals listed below:

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 660

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 XBCM replacement, setup, and programming

B3600

DTC B3600

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 B3600 03

- Passenger Compartment Dimming Request Signal Circuit Voltage Below Threshold

DTC B3600 07

- Passenger Compartment Dimming Request Signal Circuit Voltage Above Threshold

Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 146

8. If all circuits test normal, replace the appropriate sensor.

9. Reconnect all SIR components. Ignition ON, with a scan tool clear and check for DTCs.

锟斤拷 If the DTC returns and is current, replace the SDM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Inflatable Restraint Front End Sensor Replacement (See: Restraints and Safety Systems/Air Bag Systems/Impact Sensor/Service and

Repair/Inflatable Restraint Front End Sensor Replacement)

* Inflatable Restraint Side Impact Sensor Replacement (Front Side Door) (See: Restraints and Safety Systems/Air Bag Systems/Impact

Sensor/Service and Repair/Inflatable Restraint Side Impact Sensor Replacement (Front Side Door))Inflatable Restraint Side Impact Sensor

Replacement (Rear Side Door) (See: Restraints and Safety Systems/Air Bag Systems/Impact Sensor/Service and Repair/Inflatable Restraint

Side Impact Sensor Replacement (Rear Side Door))

* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming

B0087

DTC B0083-B0088

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 B0083 00

- Electronic Front End Sensor 1 No Additional Information (Left)

DTC B0083 0F

- Electronic Front End Sensor 1 Erratic (Left)

DTC B0083 39

- Electronic Front End Sensor 1 Internal Electronic Failure (Left)

DTC B0083 3A

- Electronic Front End Sensor 1 Incorrect Component Installed (Left)

DTC B0083 71

- Electronic Front End Sensor 1 Invalid Serial Data Received (Left)

DTC B0084 00

- Electronic Front End Sensor 2 No Additional Information (Right)

DTC B0084 0F

- Electronic Front End Sensor 2 Erratic (Right)

DTC B0084 39

- Electronic Front End Sensor 2 Internal Electronic Failure (Right)

DTC B0084 3A

- Electronic Front End Sensor 2 Incorrect Component Installed (Right)

DTC B0084 71

- Electronic Front End Sensor 2 Invalid Serial Data Received (Right)

DTC B0085 00

- LF Side Impact Sensor No Additional Information

DTC B0085 0F

- LF Side Impact Sensor Erratic

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 26

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Special Tools Required

J 38715-A Driver and Passenger SIR Load Tool

Circuit/System Verification

Note: Refer to SIR Service Precautions (See: Restraints and Safety Systems/Air Bag Systems/Service Precautions/Technician Safety Information)

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

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 621

DTC Descriptors

DTC B2880 01

- Tilt Position Sensor Circuit Short to Battery

DTC B2880 06

- Tilt Position Sensor Circuit Short to Ground or Open

DTC B2880 5A

- Tilt Position Sensor Circuit Plausibility Failure

DTC B2880 61

- Tilt Position Sensor Actuator Stuck

Diagnostic Fault Information

Circuit Description

The memory seat module (MSM) determines the position of the steering column based on inputs received from the tilt position sensors built into the

tilt actuators. The MSM supplies a 5-volt reference and a low reference to the sensors and monitors the column position via the steering column tilt

sensor signal circuit.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

B2880 01

The steering column tilt sensor signal voltage is greater than 4.8 volts for more than 2 seconds.

B2880 06

The steering column tilt sensor signal voltage is less than 0.2 volt for more than 2 seconds.

B2880 5A

An incorrect steering column tilt sensor signal voltage is seen.

B2880 61

The steering column tilt sensor signal voltage does not change when the tilt actuator is commanded.

Action Taken When the DTC Sets

Steering column tilt operations are suspended.

Conditions for Clearing the DTC

* A current DTC will clear when the malfunction is no longer present

* A history DTC will clear after 50 malfunction-free ignition cycles.

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 127

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using the 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 B0081 0F

- Passenger Presence System Erratic (sets in the SDM)

DTC B0081 3A

- Passenger Presence System Incorrect Component Installed (sets in the SDM)

DTC B0081 4B

- Passenger Presence System Calibration Not Learned (sets in the passenger presence (PPS) module)

DTC B0081 5A

- Passenger Presence System Plausibility Failure (sets in PPS module)

DTC B0081 39

- Passenger Presence System Internal Electronic Failure (sets in SDM)

DTC B0081 71

- Passenger Presence System Invalid Serial Data Received (sets in SDM)

Circuit/System Description

When the ignition is turned ON, the passenger presence system (PPS) and the inflatable restraint sensing and diagnostic module (SDM) performs

tests to diagnose critical malfunctions. When the SDM has completed the power-up mode, the SDM will establish communication with the PPS

module. The SDM will also request the instrument panel cluster (IPC) to illuminate both of the PASSENGER AIR BAG ON/OFF indicators ON for

5 seconds. If the SDM determines the correct PPS is installed and functioning normally, the SDM will illuminate the passenger air bags ON or OFF

indicator based on messages from the PPS. The SDM sends a message to the IPC to illuminate the appropriate PASSENGER AIR BAG ON/OFF

indicator.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

All of the following conditions must exist for 5 seconds:

B0081 0F

The SDM sets this DTC if there is a fault present in the PPS module.

B0081 3A

The SDM sets this DTC when the SDM has received a message from the PPS which indicates a mismatch between the SDM and PPS module. There

is either an incorrect SDM or PPS module installed on this vehicle.

B0081 4B

The PPS module sets this DTC when the PPS module has not learned the calibrations.

B0081 5A

The PPS module sets this code when the PPS module has lost communications with the SDM.

B0081 39

The SDM sets this DTC when the SDM has received a critical fault message from the PPS module.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 126

Important:

* When removing connectors inspect for damage, corrosion or poor connection. Damage or corrosion in the following requires

repair or replacement of the affected component/connector.

* PPS module

* SDM module

* PPS module harness connector

* SDM wiring harness connector

1. Ignition ON, verify that DTC B0081 is the only DTC set in the SDM or PPS module.

锟斤拷 If any other DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. Verify DTC B0081 0F, DTC B0081 3A, DTC B0081 39, or DTC B0081 71 is not set in the SDM. If any of these DTCs set in the SDM

diagnose the following:

* SDM DTC B0081 0F:

锟斤拷 If DTC B0081 0F sets in the SDM then the PPS module will set DTC B0081 4B or DTC B0081 5A. Refer to step #3 and diagnose the

PPS module DTC's. By diagnosing these two DTC's in the PPS module, DTC B0081 0F will be fixed in the SDM.

* SDM DTC B0081 3A:

锟斤拷 Either an incorrect replacement PPS module or SDM was placed in this vehicle. Check and make sure the part #'s are correct for each

module. If both part #'s are correct clear this DTC and see if DTC B0081 3A resets as a current DTC. If DTC B0081 3A resets then

replace the PPS module. Clear DTCs again and check if DTC B0081 3A sets as current again. If DTC B0081 3A sets again then

replace the SDM.

* SDM DTC B0081 39:

锟斤拷 If DTC B0081 39 sets in the SDM then replace the PPS module.

* SDM DTC B0081 71:

锟斤拷 If DTC B0081 71 sets in the SDM check and see if the SDM also sets DTC U0170. If DTC U0170 is set in the SDM then diagnose

DTC U0170. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic

Trouble Code (DTC) List - Vehicle). If DTC U0170 is not set in the SDM then check the connections at the SDM and PPS module.

Clear DTC's and check if DTC B0081 71 sets as current. If DTC B0081 71 sets as current again then replace the PPS module.

3. Verify DTC B0081 4B, or DTC B0081 5A is not set in the PPS module. If either of these DTCs set in the PPS module diagnose the following:

* PPS DTC B0081 4B:

锟斤拷 If DTC B0081 4B sets in the PPS module if the correct calibration was not learned by the PPS module. Perform the Passenger

Presence System Rezeroing procedure. Refer to Passenger Presence System Rezeroing (Tahoe Hybrid and Yukon Hybrid) (See:

Restraints and Safety Systems/Air Bag Systems/Testing and Inspection/Programming and Relearning/Passenger Presence System

Rezeroing (Tahoe Hybrid and Yukon Hybrid)).

* PPS DTC B0081 5A:

锟斤拷 If DTC DTC B0081 5A sets in the PPS module check the connections at the SDM and PPS module. Clear the DTC's and check if

DTC B0081 5A sets again in the PPS module. If DTC B0081 5A sets again replace the PPS module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for PPS module and SDM replacement, setup, and

programming

Except Tahoe/Yukon Hybrid (No Denali)

DTC B0081 (Except Tahoe/Yukon Hybrid (No Denali))

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 265

Circuit/System Description

The 2WD HI indicator circuit consists of a light emitting diode (LED) feed circuit, a LED and a LED control circuit. The indicator dimming control

circuit is the LED feed circuit and continuously supplies B+ to the 2WD HI, 4WD Auto, 4WD HI and 4WD LO LEDs. When the 2WD HI mode has

been selected by the driver, the transfer case shift control module (TCCM) provides a ground through the 2WD HI indicator control circuit

illuminating the LED.

The TCCM tests the 2WD HI indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the indicator dimming control

circuit by grounding the 2WD HI indicator control circuit for 2 seconds during the Bulb Test at key ON.

Conditions for Running the DTC

B0785 01

* Ignition ON

* System voltage 10-18 V

* Instrument panel lights not dimmed.

* Daylight running lights MUST be commanded ON.

* Circuit tested when the 2WD HI indicator is commanded ON.

B0785 06

* Ignition ON

* System voltage 10-18 V

* Instrument panel lights not dimmed.

* Daylight running lights MUST be commanded ON.

* Circuit tested when the 2WD HI indicator is commanded OFF.

Conditions for Setting the DTC

B0785 01

The TCCM detects 3.4 V or greater on the 2WD HI indicator control circuit when the 2WD HI indicator is commanded ON.

B0785 06

The TCCM detects 1.6 V or less for 1.5 seconds on the 2WD HI indicator control circuit when the 2WD HI indicator is commanded OFF.

Action Taken When the DTC Sets

Normal operation, the SERVICE 4WD indicator is not commanded ON. Driver is informed of fault via bulb inspection.

Conditions for Clearing the DTC

* The TCCM clears the DTC once the condition for setting the DTC is no longer present.

* A history DTC clears after 40 consecutive warm up cycles without a fault present.

* History DTCs can be cleared using a scan tool.

Diagnostic Aids

* A TRUE B+ has enough current to light a test light.

* A DIAGNOSTIC B+ is a low current circuit that DOES NOT have enough current to light a test light.

* A short to ground on the 2WD HI indicator control circuit will cause the 2WD HI indicator to remain ON at all times.

* An open or high resistance will cause the 2WD HI indicator to be inoperative during the 2 second bulb inspection.

* An open in the indicator dimming control circuit will cause the 2WD HI, 4WD Auto, 4WD HI and 4WD LO mode indicators to be inoperative

during the 2 second bulb inspection.

* EL-49741 - harness is a good source for 9 V.

* EL-49742 - harness is a good source for B+ and ground.

* With key REMOVED - opening a door puts a true B+ on the indicator dimming control circuit, TCSCS X1 pin 4. Other possible voltages are

listed below:

- Door open, key removed - indicator dimming control circuit voltage = true B+.

- Door open, key in, key OFF - indicator dimming control circuit voltage = true B+.

- Door open, key ON, engine OFF - indicator dimming control circuit voltage = diagnostic B+.

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