2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 234

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

programming

B0509

DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583

Diagnostic Instructions

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

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0158 02

- Outside Air Temperature Sensor Circuit Short to Ground

DTC B0158 05

- Outside Air Temperature Sensor Circuit Short to Battery or Open

DTC B0163 02

- Passenger Compartment Temp Sensor 1 Circuit Short to Ground

DTC B0163 05

- Passenger Compartment Temp Sensor 1 Circuit Short to Battery or Open

DTC B0168 02

- Passenger Compartment Temp Sensor 2 Circuit Short to Ground

DTC B0168 05

- Passenger Compartment Temp Sensor 2 Circuit Short to Battery or Open

DTC B0173 02

- Output Air Temperature Sensor 1 Circuit Short to Ground

DTC B0173 05

- Output Air Temperature Sensor 1 Circuit Short to Battery or Open

DTC B0178 02

- Output Air Temperature Sensor 2 Circuit Short to Ground

DTC B0178 05

- Output Air Temperature Sensor 2 Circuit Short to Battery or Open

DTC B0509 02

- Output Air Temperature Sensor 3 Circuit Short to Ground

DTC B0509 05

- Output Air Temperature Sensor 3 Circuit Short to Battery or Open

DTC B0514 02

- Output Air Temperature Sensor 4 Circuit Short to Ground

DTC B0514 05

- Output Air Temperature Sensor 4 Circuit Short to Battery or Open

DTC B3578 02

- Output Air Temperature Sensor 6 Circuit Short to Ground

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 720

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 HVAC

control module.

3. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 1 and low reference circuit terminal 2.

锟斤拷 If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the

HVAC control module.

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 HVAC control

module.

4. If all circuits test normal, test or replace the evaporator air temperature sensor.

Component Testing

1. Test the evaporator air temperature sensor by varying the sensor temperature while monitoring the sensor resistance.

2. Compare the readings with the Sensor Resistance Table (See: Heating and Air Conditioning/Specifications/Electrical Specifications) and

verify that the resistance is within 5 percent of the specification.

锟斤拷 If not within the specified range, replace the sensor.

Repair Instructions

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

* Air Conditioning Refrigerant Temperature Sensor Replacement (See: Heating and Air Conditioning/Refrigerant Temperature Sensor/Service

and Repair/HVAC - Automatic)

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

programming

B3935

DTC B3935

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 B3935 57

- Transponder Authentication Error

Circuit/System Description

When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the head of the key is

energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value,

which is received by the theft deterrent module (TDM). The TDM then compares this value to a value stored in memory. This stored value is the

learned key code. If the value is correct, the TDM will send the prerelease password via the serial data circuit to the engine control module (ECM).

If the transponder value does not match the learned key code or a transponder value is not received, the TDM will send the start disable password to

the ECM.

Conditions for Running the DTC

* Ignition is in the Accessory or Run position.

* A valid transponder value has been read.

Conditions for Setting the DTC

* The transponder value is valid and matches the value stored in the TDM memory.

* The transponder calculation to the challenge from the TDM does not match the TDM calculation.

Action Taken When the DTC Sets

* Vehicle starting will be disabled.

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 176

锟斤拷 If not within the specified range, perform the Circuit/System Testing.

2. Observe the scan tool Object Sensor Supply Voltage parameter while pressing and releasing the B71R liftgate object sensor - right. The

reading should change from Inactive to Active as the sensor is pressed and released.

锟斤拷 If the value does not change, test or replace the B71R liftgate object sensor - right.

3. Observe the scan tool Object Sensor Supply Voltage parameter while pressing and releasing the B71L liftgate object sensor - left. The reading

should change from Inactive to Active as the sensor is pressed and released.

锟斤拷 If the value does not change, test or replace the B71L liftgate object sensor - left.

4. Command the liftgate to power close by pressing the B70 liftgate close switch and as the liftgate is closing, press the B71R liftgate object

sensor - right or the B71L liftgate object sensor - left. The liftgate should stop and power open.

锟斤拷 If the liftgate continues to power close, replace the K39 liftgate module.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B71R liftgate object sensor - right.

2. Test for less than 10 ohm between the low reference circuit terminal B and ground.

锟斤拷 If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the K39 liftgate module.

3. Disconnect the harness connector at the B71L liftgate object sensor - left.

4. Ignition ON, test for 4.75-5.25 V between the signal circuit terminal A 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

K39 liftgate module.

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 K39 liftgate module.

5. Test of infinite resistance between the signal circuit terminal B and ground.

锟斤拷 If not the specified value, test the signal circuit for a short to ground.

6. Test for less than 10 ohm between the signal circuit terminal A at the B71R liftgate object sensor - right and the signal circuit terminal B at the

B71L liftgate object sensor - left.

锟斤拷 If greater than the specified range, test the signal circuit for an open/high resistance.

7. If all circuits test normal, test or replace the appropriate B71 liftgate object sensor.

Component Testing

1. Ignition OFF, disconnect the harness connector at the appropriate B71 liftgate object sensor.

2. Test for 8K-12K ohm between the signal terminal A and the low reference terminal B.

锟斤拷 If not within the specified range, replace the B71 liftgate object sensor.

Repair Instructions

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

* Liftgate Side Upper Sensor Replacement (Except Avalanche and EXT Escalade) (See: Body and Frame/Doors, Hood and Trunk/Trunk /

Liftgate/Trunk / Liftgate Position Sensor/Service and Repair)

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

programming

B0158

DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583

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.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 135

DTC B0087 71

- LR Side Impact Sensor Invalid Serial Data Received

DTC B0088 00

- RR Side Impact Sensor No Additional Information

DTC B0088 0F

- RR Side Impact Sensor Erratic

DTC B0088 39

- RR Side Impact Sensor Internal Electronic Failure

DTC B0088 3A

- RR Side Impact Sensor Incorrect Component Installed

DTC B0088 71

- RR Side Impact Sensor Invalid Serial Data Received

Diagnostic Fault Information

Circuit/System Description

The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID,

state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and

a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by

performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds.

The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit.

When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present,

the SDM will set a DTC.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

Any of the following conditions exist for 2.5 seconds:

B0083 00, B0084 00, B0085 00, B0086 00, B0087 00, B0088 00

* The front end sensor has been shorted to voltage, open, or shorted to ground.

* The front end sensor current has been above 23 mA for longer than 5 milliseconds.

* The SDM has not received a message from the front end sensor for more than 375 milliseconds.

B0083 0F, B0084 0F, B0085 0F, B0086 0F, B0087 0F, B0088 0F

The SDM has received erratic messages from the front end sensor.

B0083 39, B0084 39, B0085 39, B0086 39, B0087 39, B0088 39

* The SDM has received a Not Ok (NOK) message from the front end sensor.

* The SDM has not received a message.

* The SDM has received invalid serial data from the front end sensor.

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 613

DTC B2875 01

- Tilt Down Switch Circuit Short to Battery

Diagnostic Fault Information

Circuit Description

The memory seat module (MSM) receives voltage inputs from the tilt switch based on the position of the switch. The MSM then supplies battery

voltage and a ground to the tilt motor control circuits depending on which direction of movement is requested.

Conditions for Running the DTC

The ignition ON.

Conditions for Setting the DTC

The MSM detects a tilt switch input for more than 30 consecutive seconds after the tilt motor movement has stopped.

Action Taken When the DTC Sets

* The tilt motor will be deactivated.

* Memory recall functions will be disabled.

Conditions for Clearing the DTC

* A current DTC will clear when the failed switch input is no longer active.

* A history DTC will clear after 100 ignition cycles.

Diagnostic Aids

An intermittently stuck tilt switch may cause a DTC to set.

Reference Information

Schematic Reference

Steering Wheel Schematics (See: Diagrams/Electrical Diagrams/Steering/Steering Column/Steering Wheel Schematics)

Connector End View Reference

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

Description and Operation

Steering Wheel and Column Description and Operation (See: Steering and Suspension/Steering/Steering Column/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,observe the scan tool Tilt Up Switch parameter and Tilt Down Switch parameter while cycling the switch between states.The reading

should be Inactive and change to Active when pushing the appropriate switch.