2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 996

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 996

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

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation/ABS

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 EBCM.

2. Test for less than 1 ohm between the ground circuits listed below and ground.

* Terminal 13

* Terminal 38

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground.

* Terminal 1

* Terminal 25

瀚慖f the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance.

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

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 EBCM replacement, setup, and programming

C123E

DTC C056D, C120C, C121C, C121E, C121F, C123A-C1256, C126E-C127C, C12C2-C12DB, C12DE, C12DF, or C12F2-C12F6

Diagnostic Instructions

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

Check - Vehicle) prior to using this diagnostic procedure.

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

overview of the diagnostic approach.

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

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC C056D 00

- ECU Hardware Performance

DTC C056D 3C

- ECU Hardware Performance Internal Communications Failure

DTC C056D 59

- ECU Hardware Performance

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 832

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 832

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

Description and Operation

ABS Description and Operation (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Description and Operation/ABS

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

Verify that DTC C012F, C12A7, C12DC, or C12DD is not set.

If DTC is set replace Brake Pressure Modulator Valve (BPMV) assembly. If DTC resets, replace the EBCM

Repair Instructions

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

* Brake Pressure Modulator Valve Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Hydraulic

Control Assembly - Antilock Brakes/Service and Repair)

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

C12DE

DTC C056D, C120C, C121C, C121E, C121F, C123A-C1256, C126E-C127C, C12C2-C12DB, C12DE, C12DF, or C12F2-C12F6

Diagnostic Instructions

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

Check - Vehicle) prior to using this diagnostic procedure.

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

overview of the diagnostic approach.

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

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC C056D 00

- ECU Hardware Performance

DTC C056D 3C

- ECU Hardware Performance Internal Communications Failure

DTC C056D 59

- ECU Hardware Performance

DTC C120C

- Brake Pedal Position Sensor 4 Plausibility

DTC C121C

- EBCM Internal Communication Error

DTC C121E

- EBCM Unimplemented Interrupt

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 756

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 756

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, observe the scan tool Windshield Wiper Switch parameter while rotating the wiper switch. The reading should change between Off,

Intermittent, and Low.

Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the turn signal multifunction switch.

2. Ignition ON, verify the scan tool Windshield Wiper Switch parameter is OFF.

瀚慖f not the specified value, test the signal circuit terminal N for a short to ground. If the circuit tests normal, replace the BCM.

3. If all circuits test normal, test or replace the turn signal multifunction switch.

Component Testing

Turn Signal Multifunction Switch

1. Ignition OFF, disconnect the X1 harness connector at the turn signal multifunction switch.

2. With the wiper switch in the HIGH position, test for less than 2 ohms between the low reference terminal M and the signal terminal K.

瀚慖f greater than the specified range, replace the windshield wiper washer switch.

Important: If the switch tests open in any switch position other than Off, test the signal circuits for a short to voltage before

replacing the switch.

3. While cycling the wiper switch through each delay and speed position, test for the specified resistance between the low reference terminal M

and the signal terminal N.

If any switch position is not within the specified range, replace the turn signal multifunction switch.

Repair Instructions

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

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 585

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 585

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

Description and Operation

OnStar Description and Operation (See: Accessories and Optional Equipment/Description and Operation/OnStar Description and Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone.

2. Test for less than 10 Ohms between the low reference circuit terminal A and ground.

瀚慖f greater than the specified range, test the circuit for an open/high resistance.

3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal B and ground.

瀚慖f less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

CIM.

瀚慖f greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.

4. If all circuits test normal, replace the B24 cellular phone microphone.

Repair Instructions

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

* Mobile Telephone Microphone Replacement (See: Accessories and Optional Equipment/Cellular Phone/Cellular Phone Microphone/Service

and Repair)

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

Communication Interface Module

DTC B2462 (Communication Interface Module)

Diagnostic Instructions

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

Check - Vehicle) prior to using this diagnostic procedure.

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

overview of the diagnostic approach.

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

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2462 02

- Global Positioning System (GPS) Antenna Malfunction Short to Ground

DTC B2462 04

- Global Positioning System (GPS) Antenna Malfunction Open Circuit

Circuit/System Description

The telematics communication interface control module receives information from the cellular phone and navigation antenna located on the outside

of the vehicle. The cellular phone and navigation antenna is connected to the telematics communication interface control module via a shielded

coaxial cable. The antenna cable also provides a path for DC current for powering the cellular phone and navigation antenna.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 947

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 947

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

Description and Operation

Power Steering System Description and Operation (Hydraulic Power Steering) (See: Steering and Suspension/Steering/Description and

Operation/Power Steering System Description and Operation (Hydraulic Power Steering))Power Steering System Description and Operation (EPS)

(See: Steering and Suspension/Steering/Description and Operation/Power Steering System Description and Operation (EPS))

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

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal

Protection Equipment (PPE) and proper procedures must be followed.

The High Voltage Disabling procedure will perform the following tasks:

* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must

be followed.

Failure to follow the procedures exactly as written may result in serious injury or death.

Important: After verifying a circuit fault exists in the Power Steering Assist Motor Wiring Harness for Two Mode Hybrid, the Power

Steering Assist Motor is to be replaced and not repaired

1. Perform the High Voltage Disabling () procedure.

2. Ignition OFF, connect the 12-volt battery.

3. Ignition OFF, disconnect the harness connector at the PSCM.

4. Test for less than 1 ohm between the following circuits listed below.

* Control circuit terminal 2 and control circuit terminal 1

* Control circuit terminal 1 and control circuit terminal 3

* Control circuit terminal 2 and control circuit terminal 3

瀚慖f greater than the specified range, replace the power steering assist motor.

5. Test for greater than infinite resistance between the following circuits listed below and the power steering motor housing.

* Control circuit terminal 2

* Control circuit terminal 1

* Control circuit terminal 3

瀚慖f less than the specified range, replace the power steering assist motor.

6. If all circuits test normal, test or replace the PSCM.

Repair Instructions

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

* Power Steering Assist Motor Replacement (See: Steering and Suspension/Steering/Power Steering/Power Steering Motor/Service and

Repair)

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

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 799

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 799

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, observe the scan tool Windshield Wiper Switch parameter while rotating the wiper switch. The reading should change between Off,

Intermittent, and Low.

Circuit/System Testing

1. Ignition OFF, disconnect the X3 harness connector at the turn signal multifunction switch.

2. Ignition ON, verify the scan tool Windshield Wiper Switch parameter is OFF.

瀚慖f not the specified value, test the signal circuit terminal N for a short to ground. If the circuit tests normal, replace the BCM.

3. If all circuits test normal, test or replace the turn signal multifunction switch.

Component Testing

Turn Signal Multifunction Switch

1. Ignition OFF, disconnect the X1 harness connector at the turn signal multifunction switch.

2. With the wiper switch in the HIGH position, test for less than 2 ohms between the low reference terminal M and the signal terminal K.

瀚慖f greater than the specified range, replace the windshield wiper washer switch.

Important: If the switch tests open in any switch position other than Off, test the signal circuits for a short to voltage before

replacing the switch.

3. While cycling the wiper switch through each delay and speed position, test for the specified resistance between the low reference terminal M

and the signal terminal N.

If any switch position is not within the specified range, replace the turn signal multifunction switch.

Repair Instructions

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

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 699

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 699

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, command the tilt motor UP and DOWN with a scan tool. The reading should be between 0.2 and 4.8 volts.

Circuit/System Testing

Tilt Sensor Circuit Malfunction

1. Ignition OFF, disconnect the harness connector at the tilt actuator.

2. Ignition OFF, test for less than 10.0 ohms between the low reference circuit terminal E and ground.

瀚慖f greater than the specified range, 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 D and ground.

瀚慖f 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.

瀚慖f 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 scan tool Tilt Sensor parameter is less than 0.2 volt.

瀚慖f greater than the specified range, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the MSM.

5. Install a 3A fused jumper wire between the signal circuit terminal C and the 5-volt reference circuit terminal D. Verify the scan tool Tilt

Sensor parameter is greater than 4.8 volts.

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

the MSM.

6. Install a test lamp between the control circuit terminal A and the control circuit terminal B.

7. Command the column to tilt up and down using the tilt switch. The test lamp should illuminate with each command.

瀚慖f the test lamp does not illuminate, test both control circuits for a short to ground or an open/high resistance. If the circuits test normal,

replace the MSM.

8. If all circuits test normal, test or replace the tilt actuator.

Component Testing

Tilt Actuator

1. Ignition OFF, disconnect the harness connector at the tilt actuator.

2. Test for less than 2.0 ohms between the control terminal A and the control terminal B.

瀚慖f greater than the specified range, replace the tilt actuator.

Repair Instructions

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

* Tilt Motor Replacement (See: Steering and Suspension/Steering/Steering Column/Tilt Wheel Motor/Service and Repair)

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 686

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 686

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

Description and Operation

Automatic Transmission Shift Lock Control Description and Operation (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Shift Interlock/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. Ignition ON, clear the DTC. Observe the scan tool BCM Stop Lamp Relay Command parameter while pressing and releasing the brake pedal.

The parameter should change between ON and OFF.

瀚慖f the parameter does not change between the specified values, refer to Stop Lamps Malfunction (See: Lighting and Horns/Testing and

Inspection/Stop Lamps Malfunction).

2. Press the brake pedal, the vehicle operator should be able to move the shifter out of the PARK position.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the shift lock control solenoid.

2. Ignition OFF, test for less than 5.0 ohm between the ground circuit terminal B and ground.

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

3. Install a test lamp between the ground circuit terminal B and the control circuit terminal A.

4. Ignition ON, command the scan tool BCM Shift Lock Solenoid output control ON and OFF. The test lamp should turn ON and OFF as

commanded.

瀚慖f the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the BCM.

瀚慖f the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the

BCM.

5. If the circuit tests normal, replace the transmission control.

Repair Instructions

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

* Automatic Transmission Shift Lock Control Actuator Replacement (See: Powertrain Management/Transmission Control Systems/Actuators

and Solenoids - Transmission and Drivetrain/Actuators and Solenoids - A/T/Shift Interlock Solenoid/Service and Repair)

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

MP 3010-NP0 - Transfer Case

DTC B2725

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.

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2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 621

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

Description and Operation

OnStar Description and Operation (See: Accessories and Optional Equipment/Description and Operation/OnStar Description and Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone.

2. Test for less than 10 Ohms between the low reference circuit terminal A and ground.

瀚慖f greater than the specified range, test the circuit for an open/high resistance.

3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal B and ground.

瀚慖f less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the

CIM.

瀚慖f greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.

4. If all circuits test normal, replace the B24 cellular phone microphone.

Repair Instructions

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

* Mobile Telephone Microphone Replacement (See: Accessories and Optional Equipment/Cellular Phone/Cellular Phone Microphone/Service

and Repair)

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

Communication Interface Module

DTC B2462 (Communication Interface Module)

Diagnostic Instructions

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

Check - Vehicle) prior to using this diagnostic procedure.

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

overview of the diagnostic approach.

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

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2462 02

- Global Positioning System (GPS) Antenna Malfunction Short to Ground

DTC B2462 04

- Global Positioning System (GPS) Antenna Malfunction Open Circuit

Circuit/System Description

The telematics communication interface control module receives information from the cellular phone and navigation antenna located on the outside

of the vehicle. The cellular phone and navigation antenna is connected to the telematics communication interface control module via a shielded

coaxial cable. The antenna cable also provides a path for DC current for powering the cellular phone and navigation antenna.

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2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 489

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

Description and Operation

Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Verification

Refer to Battery Electrical Drain/Parasitic Load Test (See: Starting and Charging/Testing and Inspection/Component Tests and General

Diagnostics/Battery Electrical Drain/Parasitic Load Test).

Repair Instructions

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

B1529

DTC B1529

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 B1529 03

- Device Voltage Reference Output Circuit Voltage Below Threshold

DTC B1529 07

- Device Voltage Reference Output Circuit Voltage Above Threshold

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) supplies voltage to the audio steering wheel control switches and monitors the return signal. Each switch state is

associated to a set resistance value and when pressed a specific voltage drop occurs across the resistor unique to the switch. The BCM identifies the

switch selection and activates the feature.

Conditions for Running the DTC

* Battery voltage is between 9-16 volts

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2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 483

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

Description and Operation

Retained Accessory Power Description and Operation (See: Power and Ground Distribution/Description and Operation/Retained Accessory Power

Description and Operation)

Electrical Information Reference

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

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Circuit/System Testing

1. Ignition ON, verify DTC B1475 is set as current.

瀚慖f 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)

瀚慖f 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.

瀚慖f 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

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1241

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1241

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

* Inline Harness Connector End Views (See: Power and Ground Distribution/Multiple Junction Connector/Diagrams)

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)

Special Tools

DT-48493 Jumper Harness

Circuit/System Testing

Note: The drive motor generator position sensor circuits require proper circuit integrity for correct system operation. Just a few ohms of

additional circuit resistance may cause position sensor signal degradation.

* Always inspect position sensor signal connectors for proper terminal contact.

* All diagnostic connections must be made with the approved test probes to prevent the creation of poor terminal contact.

* Connectors that contain position sensor signal circuits must always be clean and dry prior to mating. Foreign material or moisture within

the connector may cause sensor signal degradation.

1. Ignition OFF, disconnect PIM X1 connector.

2. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as

indicated. Also test each circuit for a short to ground.

瀚慖f any of the circuits are not within specification, continue with testing.

瀚慖f all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, perform the

Intermittent Condition Testing below.

3. Disconnect the transmission X176 24-way connector.

4. Connect the DT-48493 to the X176 24-way connector at the transmission.

5. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits

as indicated. Also test each circuit for a short to ground.

瀚慖f all circuits test normal, continue with testing.

瀚慖f any of the circuits are not within specification, test the internal transmission harness for the condition. If the internal transmission

harness tests OK, replace the applicable drive motor generator.

6. Disconnect DT-48493 from the transmission X176 24-way connector.

7. Connect the DT-48493 to the transmission X176 24-way connector at the vehicle harness.

8. Disconnect PIM X1 connector.

9. Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 connector and

transmission X176. Also test these circuits for short to ground and to the shield circuit if the shield circuit is not presently grounded to the

PIM assembly.

瀚慖f any of the circuits are not within the specified range, repair or replace the wiring harness.

瀚慖f all circuits test normal, inspect transmission connector X176 for proper terminal contact. If transmission connector X176 tests OK,

inspect the harness for an intermittent concern.

Intermittent Condition Testing

1. If possible, determine which of the position sensor circuits have the intermittent condition by reviewing the Diagnostic Fault Information

table. For example, DTCs P0C57 and P0C52 only set for a short to ground condition on either the S1 or S3 circuit.

2. Using the Position Sensor Specification table listed below, monitor the position sensor circuits at PIM X1 connector while manipulating the

applicable harness and connectors.

瀚慖f any of the circuits are not within specification, repair the harness or terminal as required. If a harness repair is indicated and external

harness damage is not evident, the most likely location for internal wire damage is near the harness clamping locations.

3. Disconnect transmission X176 connector and inspect for the following:

* Proper terminal contact

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1238

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1238

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

* Inline Harness Connector End Views (See: Power and Ground Distribution/Multiple Junction Connector/Diagrams)

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)

Special Tools

DT-48493 Jumper Harness

Circuit/System Testing

Note: The drive motor generator position sensor circuits require proper circuit integrity for correct system operation. Just a few ohms of

additional circuit resistance may cause position sensor signal degradation.

* Always inspect position sensor signal connectors for proper terminal contact.

* All diagnostic connections must be made with the approved test probes to prevent the creation of poor terminal contact.

* Connectors that contain position sensor signal circuits must always be clean and dry prior to mating. Foreign material or moisture within

the connector may cause sensor signal degradation.

1. Ignition OFF, disconnect PIM X1 connector.

2. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as

indicated. Also test each circuit for a short to ground.

瀚慖f any of the circuits are not within specification, continue with testing.

瀚慖f all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, perform the

Intermittent Condition Testing below.

3. Disconnect the transmission X176 24-way connector.

4. Connect the DT-48493 to the X176 24-way connector at the transmission.

5. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits

as indicated. Also test each circuit for a short to ground.

瀚慖f all circuits test normal, continue with testing.

瀚慖f any of the circuits are not within specification, test the internal transmission harness for the condition. If the internal transmission

harness tests OK, replace the applicable drive motor generator.

6. Disconnect DT-48493 from the transmission X176 24-way connector.

7. Connect the DT-48493 to the transmission X176 24-way connector at the vehicle harness.

8. Disconnect PIM X1 connector.

9. Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 connector and

transmission X176 connector. Also test these circuits for short to ground and to the shield circuit if the shield circuit is not presently

grounded to the PIM assembly.

瀚慖f any of the circuits are not within the specified range, repair or replace the wiring harness.

瀚慖f all circuits test normal, inspect transmission connector X176 for proper terminal contact. If transmission connector X176 tests OK,

inspect the harness for an intermittent concern.

Intermittent Condition Testing

1. If possible, determine which of the position sensor circuits have the intermittent condition by reviewing the Diagnostic Fault Information

table. For example, DTCs P0C57 and P0C52 only set for a short to ground condition on either the S1 or S3 circuit.

2. Using the Position Sensor Specification table listed below, monitor the position sensor circuits at PIM X1 connector while manipulating the

applicable harness and connectors.

瀚慖f any of the circuits are not within specification, repair the harness or terminal as required. If a harness repair is indicated and external

harness damage is not evident, the most likely location for internal wire damage is near the harness clamping locations.

3. Disconnect transmission X176 connector and inspect for the following:

* Proper terminal contact

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1235

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1235

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

* Inline Harness Connector End Views (See: Power and Ground Distribution/Multiple Junction Connector/Diagrams)

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)

Special Tools

DT-48493 Jumper Harness

Circuit/System Testing

Note: The drive motor generator position sensor circuits require proper circuit integrity for correct system operation. Just a few ohms of

additional circuit resistance may cause position sensor signal degradation.

* Always inspect position sensor signal connectors for proper terminal contact.

* All diagnostic connections must be made with the approved test probes to prevent the creation of poor terminal contact.

* Connectors that contain position sensor signal circuits must always be clean and dry prior to mating. Foreign material or moisture within

the connector may cause sensor signal degradation.

1. Ignition OFF, disconnect PIM X1 connector.

2. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the PIM X1 circuits as

indicated. Also test each circuit for a short to ground.

瀚慖f any of the circuits are not within specification, continue with testing.

瀚慖f all circuits test normal, inspect for proper terminal contact at PIM X1 connector. If PIM X1 terminal contact tests OK, perform the

Intermittent Condition Testing below.

3. Disconnect the transmission X176 24-way connector.

4. Connect the DT-48493 to the X176 24-way connector at the transmission.

5. Using the Position Sensor Specification table specifications listed below, test the position sensor resistance at the transmission X176 circuits

as indicated. Also test each circuit for a short to ground.

瀚慖f all circuits test normal, continue with testing.

瀚慖f any of the circuits are not within specification, test the internal transmission harness for the condition. If the internal transmission

harness tests OK, replace the applicable drive motor generator.

6. Disconnect DT-48493 from the transmission X176 24-way connector.

7. Connect the DT-48493 to the transmission X176 24-way connector at the vehicle harness.

8. Disconnect PIM X1 connector.

9. Using the PIM to Transmission Terminal Reference table listed below, test the vehicle harness continuity between PIM X1 connector and

transmission X176. Also test these circuits for short to ground and to the shield circuit if the shield circuit is not presently grounded to the

PIM assembly.

瀚慖f any of the circuits are not within the specified range, repair or replace the wiring harness.

瀚慖f all circuits test normal, inspect transmission connector X176 for proper terminal contact. If transmission connector X176 tests OK,

inspect the harness for an intermittent concern.

Intermittent Condition Testing

1. If possible, determine which of the position sensor circuits have the intermittent condition by reviewing the Diagnostic Fault Information

table. For example, DTCs P0C57 and P0C52 only set for a short to ground condition on either the S1 or S3 circuit.

2. Using the Position Sensor Specification table listed below, monitor the position sensor circuits at PIM X1 connector while manipulating the

applicable harness and connectors.

瀚慖f any of the circuits are not within specification, repair the harness or terminal as required. If a harness repair is indicated and external

harness damage is not evident, the most likely location for internal wire damage is near the harness clamping locations.

3. Disconnect transmission X176 connector and inspect for the following:

* Proper terminal contact

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1197

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1197

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)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

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

Special Tools

DT-48493 Jumper Harness, 24 terminal

Circuit/System Verification

P0A2B and P0A31

1. Allow the vehicle to cool to ambient temperature by leaving the ignition OFF for 6 or more hours.

2. Ignition ON, observe Motor 1 temperature, Motor 2 temperature, and phase U, V, W inverter temperature scan tool parameters.

瀚慣he Motor 1 Temperature, Motor 2 Temperature, and phase U, V, W inverter temperature parameters should be within 28掳C (50掳F) of

each other and ambient temperature.

P0A2C, P0A2D, P0A32, and P0A33

Ignition ON, observe the MCM motor temperature scan tool parameter.

The motor temperature parameter should be between 0.29V and 4.42V.

Circuit/System Testing

1. Ignition OFF, disconnect the transmission X176 24-way harness connector.

Important: The ignition must be ON to test the low reference circuit. Other DTCs will set with the X176 connector disconnected.

2. Ignition ON, test the vehicle harness side for less than 8 ohms between the low reference circuit terminal and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PIM.

3. Ignition ON, verify the scan tool motor temperature sensor parameter is greater than 4.42V.

瀚慖f less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PIM.

4. Install a 3-amp fused jumper wire between the signal circuit terminal and the low reference circuit terminal. Verify the scan tool motor

temperature sensor parameter is less than 0.29V.

Important: If a short to voltage is found, test the motor temperature sensor for damage.

瀚慖f greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the PIM.

5. Connect the DT-48493 to the X176 transmission 24-way connector at the transmission. Measure and record the resistance between the sensor

signal and low reference terminals. Compare the actual sensor and circuit resistance to the expected sensor resistance. Refer to Temperature

Versus Resistance ().

瀚慖f the resistance is near the expected value, test the transmission internal harness signal circuit for a short to ground. If the circuit tests

normal, replace the drive motor w/generator.

瀚慖f the resistance is not near the expected value, test the transmission internal harness signal and low reference circuits for an open or

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1088

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1088

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

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls 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 trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the trailer

brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the trailer brake control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the trailer brake

control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the trailer

brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

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

the trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the trailer brake

control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater 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 trailer brake control module.

9. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 6 and ground.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1082

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1082

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

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls 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 trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the trailer

brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the trailer brake control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the trailer brake

control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the trailer

brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

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

the trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the trailer brake

control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater 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 trailer brake control module.

9. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 6 and ground.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1076

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1076

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

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls 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 trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the trailer

brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the trailer brake control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the trailer brake

control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the trailer

brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

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

the trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the trailer brake

control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater 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 trailer brake control module.

9. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 6 and ground.

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1070

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1070

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

Description and Operation

Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and

Operation/Trailer Brake Controls 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 trailer brake controls user gain parameter. The reading should be between 0-100 percent, and change with

operating the gain switch up or gain switch down.

Circuit/System Testing

Note: These diagnostics are based on having no trailer connected.

1. Ignition ON, verify that DTC P2534 is not set.

瀚慖f the DTC is set, refer to DTC P2534 (See: P Code Charts/P2534/Wiring Systems and Power Management).

2. Ignition OFF, disconnect the harness connector at the trailer brake controller switch.

3. Test for less than 5 ohm between the low reference circuit terminal 8 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the trailer

brake control module.

4. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the trailer brake control module.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the trailer brake

control module.

5. Verify the scan tool Manual Apply Switch parameter is less than 5 percent.

瀚慖f greater than the specified range, test the signal circuit terminal 4 for a short to voltage. If the circuit tests normal, replace the trailer

brake control module.

6. Install a 3 A fused jumper wire between the signal circuit terminal 4 and the 5 V reference circuit terminal 3. Verify the scan tool Manual

Apply Switch parameter is greater than 90 percent.

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

the trailer brake control module.

7. Verify the scan tool Redundant Manual Apply Switch parameter is greater than 90 percent.

瀚慖f less than the specified range, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the trailer brake

control module.

8. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the 5 V reference circuit terminal 3. Verify the scan tool Redundant

Manual Apply Switch parameter is less than 2 percent.

瀚慖f greater 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 trailer brake control module.

9. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal 6 and ground.

2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1751

2010 Cadillac Truck Escalade ESV AWD V8-6.2L Page 1751

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)

* Heated Oxygen Sensor Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical

Diagnostic Procedures/Wiring Repairs/Heated Oxygen Sensor Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

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

Circuit/System Verification

* Observe the DTC information with a scan tool. Verify there are no B52 HO2S heater or fuel trim DTCs set.

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

Trouble Code (DTC) List - Vehicle).

* Engine idling at operating temperature, observe the appropriate B52 HO2S parameter with a scan tool. Verify the following:

- The B52 HO2S 1 value should vary from below 200 mV to above 800 mV and respond to fueling changes.

- The B52 HO2S 2 value should change greater than 200 mV when the throttle is quickly cycled 3 times from closed to wide open and

back to closed after running the engine at 1,500 RPM for 30 s.

* Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Verify none of the following conditions exist:

* Lean or rich fuel injectors-Refer to Fuel Injector Diagnosis (CH47976) (See: Powertrain Management/Fuel Delivery and Air

Induction/Fuel Injector/Testing and Inspection)Fuel Injector Diagnosis (J39021 or Scan Tool) (See: Powertrain Management/Fuel

Delivery and Air Induction/Fuel Injector/Testing and Inspection)

* Water intrusion in the B52 HO2S harness connector

* Low or high fuel system pressure-Refer to Fuel System Diagnosis (w/o FPCM) (See: Powertrain Management/Computers and Control

Systems/Testing and Inspection/Component Tests and General Diagnostics)Fuel System Diagnosis (FPCM) (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics)

* Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool) (See: Powertrain

Management/Computers and Control Systems/Testing and Inspection/Component Tests and General

Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool) (

See: Powertrain Management/Fuel Delivery and Air Induction/Fuel/Testing and Inspection/Alcohol/Contaminants-in-Fuel Diagnosis

(Special Tool))

* Fuel saturation of the evaporative emission (EVAP) canister

* Exhaust leaks near the B52 HO2S

* Engine vacuum leaks

* Engine oil consumption-Refer to Oil Consumption Diagnosis (See: Engine, Cooling and Exhaust/Engine/Testing and

Inspection/Component Tests and General Diagnostics/Oil Consumption Diagnosis)

* Engine coolant consumption-Refer to Loss of Coolant (See: Engine, Cooling and Exhaust/Cooling System/Testing and

Inspection/Symptom Related Diagnostic Procedures/Loss of Coolant)

锟斤拷If you find any of the above conditions, repair as necessary.

2. If all conditions test normal, test or replace the appropriate B52 HO2S.

Repair Instructions

Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (See: Powertrain Management/Computers and Control