2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2773

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2773

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)

Circuit/System Verification

With a scan tool, ensure the following DTCs are not present in the modules as follows:

BCM

* U1814

* U2099

SDGM

* U1812

* B1453

If any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic

Trouble Code (DTC) List - Vehicle) to diagnose that DTC prior to this diagnostic.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X2 at the SDGM.

2. Verify less than 0.5 volts between the wake up signal circuit terminal 19 and ground.

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

3. Ignition ON, verify B+ between the communication enable signal circuit terminal 16 and ground.

瀚慖f less than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the BCM.

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

Repair Instructions

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

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

Procedures/Wiring Repairs/GMLAN Wiring Repairs)

U209D

DTC U209D

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 U209D 00

- Battery Energy Control Module High Speed Communication Enable Circuit High

Diagnostic Fault Information

Circuit/System Description

Modules connected to the LAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating information

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2446

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2446

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)

Description and Operation

* Electronic Component Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Electronic Component Description)

* Transmission General Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Transmission General Description)

* Transmission Component and System Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Transmission Component and System Description)

* Park - Engine Running (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Park - Engine Running)

* Reverse (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6L45/6L50/6L80/6L90 -

Automatic Transmission/Reverse)

* Neutral - Engine Running (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Neutral - Engine Running)

* Drive Range, First Gear Engine Braking (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/First Gear Engine Braking)

* Drive Range, First Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/First Gear)

* Drive Range, Second Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Second Gear)

* Drive Range, Third Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Third Gear)

* Drive Range, Third Gear Default (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Third Gear Default)

* Drive Range - Fourth Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Fourth Gear)

* Drive Range, Fifth Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Fifth Gear)

* Drive Range, Fifth Gear Default (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Fifth Gear Default)

* Drive Range, Sixth Gear (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/6L45/6L50/6L80/6L90 - Automatic Transmission/Drive Range/Sixth Gear)

* Fluid Passages (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6L45/6L50/6L80/6L90 -

Automatic Transmission/Fluid Passages)

DTC Type Reference

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

(DTC) Type Definitions)

Scan Tool Reference

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

Circuit/System Verification

Note: If other DTCs are set, diagnose those DTCs first.

1. Engine idling in Park, with parking brake applied and drive wheels chocked.

2. Perform the Transmission Fluid Level and Condition Check (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing

and Inspection/Initial Inspection and Diagnostic Overview/6L45/6L50/6L80/6L90 - Automatic Transmission/Transmission Fluid Level and

Condition Check) to verify correct fluid level and condition.

Note: Perform a scan tool snapshot, during the road test.

3. Perform the Road Test (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Initial Inspection and

Diagnostic Overview/6L45/6L50/6L80/6L90 - Automatic Transmission/Road Test). Verify the transmission operation performs as indicated

in the road test instructions.

4. Review the scan tool snapshot transmission data parameters. Verify the engine and transmission data parameters display the correct values in

all forward gear ranges:

* Engine Speed

* Vehicle Speed

* Transmission ISS

* Transmission OSS

* Shift Solenoid Valve 1

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2235

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)

* Probing Electrical Connectors (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Circuit Testing/Probing Electrical Connectors)

* Electrical Center Identification Views (See: Maintenance/Fuses and Circuit Breakers/Fuse/Application and ID)

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

* J 35616 GM-Approved Terminal Test Kit

* J 43244 Relay Puller Pliers

Circuit/System Verification

1. Ignition ON, engine OFF, command the powertrain relay ON and OFF, with a scan tool, while observing the following powertrain relay coil

control circuit status parameters.

* Powertrain relay coil control Ckt. Short Gnd Test Status

* Powertrain relay coil control Ckt. Open Test Status

* Powertrain relay coil control Ckt. Short Volts Test Status

Each parameter should toggle between OK and Not Run or Not Run and OK

2. Ignition ON, observe the DTC information with a scan tool. DTC P0685, P0689 or P0690 should not set.

3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed

from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note: You must perform the Circuit/System Verification first.

1. Ignition OFF, disconnect the KR75 powertrain relay.

2. Verify a test lamp illuminates between both of the following relay battery voltage circuit terminals and ground:

* Terminal 85

* Terminal 30

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

Note: The ignition voltage circuit is between the powertrain relay and the ECM. The ignition voltage is a feedback circuit.

3. Ignition OFF, verify that a test lamp does not illuminate between the ignition voltage circuit terminal 87 and ground.

瀚慖f the test lamp illuminates, test the ignition voltage circuit for a short to voltage.

4. Connect a 20 A fused jumper wire between the relay switch B+ circuit terminal 30 and the relay switch ignition voltage circuit terminal 87.

5. Ignition ON, observe the scan tool EC Ignition Relay Feedback Signal parameter. The ECM should communicate, and the parameter should

display 9-14 V.

瀚慖f not the specified range, or the ECM does not communicate, test the ignition voltage circuit between the powertrain relay and the ECM

for a short to ground or for an open/high resistance. If the circuit/connections test normal, replace the K20 ECM.

6. Ignition OFF, verify that a test lamp does not illuminate between the control circuit terminal 86 and B+.

瀚慖f the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.

7. Connect a DMM set to the diode setting between the control circuit terminal 86 and ground.

8. Ignition ON, verify the DMM does not display OL.

瀚慖f the DMM displays OL, test the control circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the

K20 ECM.

9. If all circuits test normal, replace the KR75 powertrain relay.

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2209

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2209

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 A/C Relay ON and OFF with a scan tool. Feel/listen for the A/C relay to click.

Circuit/System Testing

1. Ignition OFF, disconnect the A/C relay.

2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 86 and ground.

瀚慖f the test lamp illuminates, test the control circuit for a short to voltage.

3. Verify that a test lamp illuminates between the ignition circuit terminal 85 and ground.

瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or a open/high resistance. If the circuit tests normal and

ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.

4. Verify that a test lamp illuminates between the relay B+ circuit terminal 30 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or a open/high resistance. If the circuit tests normal and B+

circuit fuse is open, replace the A/C clutch relay.

5. Disconnect the harness connector at the A/C clutch coil.

6. Test for less than 1 ohm between the ground circuit terminal 2 and ground.

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

7. Connect the harness connector at the A/C clutch coil.

8. Connect a 10-amp fused jumper wire between the B+ circuit terminal 30 and control circuit terminal 87. Verify the A/C clutch is activated.

瀚慖f the A/C clutch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the A/C

clutch.

9. Connect a test lamp between the ignition circuit terminal 85 and the control circuit terminal 86.

10. Command the A/C relay output function ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the

commanded states.

瀚慖f the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.

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

the ECM.

11. If all circuits test normal, test or replace the A/C clutch relay.

Component Testing

1. Ignition OFF, disconnect the A/C COMP relay.

2. Test for 60-180 ohms between terminals 85 and 86.

瀚慖f the resistance is not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f not the specified value, replace the relay.

4. Install a 30-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test

for less than 2 ohms between terminals 30 and 87.

瀚慖f greater than the specified range, replace the relay.

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1896

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-47825-10 Jumper Harness

* DT-48493 Jumper Harness

Circuit/System Verification

Test for correct operation of the Direction IMS in every range selection. Refer to Typical Scan Tool Data.

If the IMS operation matches the logic table, the system is functioning normally.

Circuit/System Testing

1. Disconnect the transmission X176 24-way connector. Ignition ON. The scan tool Direction IMS parameter should display HIGH for the R1,

R2, D1, D2 and S signal circuit displays.

瀚慖f a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground.

瀚慖f the circuit tests normal, replace the PIM.

2. Install DT-48493 to the vehicle harness connector X176. Verify that a test lamp illuminates between the direction IMS switch ground circuit

and battery positive.

瀚慖f the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to

voltage condition.

瀚慖f the circuit tests normal, replace the PIM.

3. Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at DT-48493 and the ground circuit terminal. The scan tool

parameter should display LOW for each signal circuit when grounded.

瀚慖f a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to

voltage condition.

瀚慖f the circuit tests normal, replace the PIM.

4. Disconnect the transmission 16-way X1 connector. Install DT-47825-10 to the vehicle harness. Connect a 3-amp fused jumper wire between

the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded.

瀚慖f the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to

voltage condition.

瀚慖f the circuit tests normal, replace the PIM.

Important: The remaining diagnostic steps test the internal transmission components and circuits. The automatic transmission fluid

pan assembly must be removed in order to perform the diagnostic tests.

5. Disconnect the IMS connector at the switch.

Important: Connect one end of the DT-48493 to the transmission connector. Use the other end as the terminal testing point.

瀚慣est the direction signal circuits and the ground circuit between the IMS and the transmission 24-way X176 connector for a short to

ground, open, high resistance or short to voltage condition.

Important: Connect one end of the DT-47825-10 to the transmission connector. Use the other end as the terminal testing point.

瀚慣est the Starter signal circuit between the IMS and the transmission 16-way X1 connector for a short to ground, open, high resistance or

short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path.

瀚慖f the circuit, including the TCM, tests normal, replace the IMS switch.

Repair Instructions

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

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 421

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 rear video display.

2. Ignition ON, test for 100-300 Hz at the control circuit terminal 9.

瀚慖f not within the specified range, test the control circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit

tests normal, replace the radio.

3. If all circuits test normal, replace the rear video display.

Repair Instructions

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

* Video Display Replacement (Second Row) (See: Accessories and Optional Equipment/Entertainment Systems/Television / Monitor/Service

and Repair/Video Display Replacement (Second Row))Video Display Replacement (Third Row) (See: Accessories and Optional

Equipment/Entertainment Systems/Television / Monitor/Service and Repair/Video Display Replacement (Third Row))

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

B1325

DTC B1325

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 B1325 03

- Device Power Circuit Voltage Below Threshold

DTC B1325 07

- Device Power Circuit Voltage Above Threshold

Diagnostic Fault Information

Circuit/System Description

The control modules on this vehicle monitor the voltage on the battery positive (B+) voltage circuits. The following modules on this vehicle will set

DTC B1325 if high or low battery voltage is detected:

* Audio amplifier

* Instrument panel cluster (IPC)

* Passenger presence system (PPS)

* Radio

* Rear object sensor control module

Conditions for Running the DTC

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 414

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-48028 Digital Radio Test Antenna

Circuit System Verification

With the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM. Verify XM reception is clear and the No XM Signal

message is not displayed on the radio.

Circuit/System Testing

1. Ignition OFF, disconnect the antenna coax from the DRR. Connect the EL-48028 to the DRR.

2. Radio ON, tuned to XM, verify DTC B1259 is not set as current.

瀚慖f the DTC is current, replace the DRR.

3. Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the digital radio antenna.

4. Ignition ON, test for 4.5-5.5 volts between the antenna coax center terminal and the coax outer shield.

瀚慖f not within the specified range, replace the antenna coax.

5. If all circuits test normal, replace the digital radio antenna.

Repair Instructions

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

* Cellular Communications/Digital Radio Antenna Replacement (See: Accessories and Optional Equipment/Antenna/Antenna, Radio/Service

and Repair/Cellular Communications/Digital Radio Antenna Replacement)

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

B1277

DTC B1277, B127C, or B127D

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 B1277 01

- Microphone 1 (LF) Input Signal Circuit Short to Battery

DTC B1277 02

- Microphone 1 (LF) Input Signal Circuit Short to Ground

DTC B1277 04

- Microphone 1 (LF) Input Signal Circuit Open

DTC B1277 1A

- Microphone 1 (LF) Input Signal Circuit Bias Level Out of Range

DTC B127C 01

- Microphone 2 (RF) Input Signal Circuit Short to Battery

2010 Cadillac Truck Escalade RWD V8-6.2L Page 2773

2010 Cadillac Truck Escalade RWD V8-6.2L Page 2773

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)

Circuit/System Verification

With a scan tool, ensure the following DTCs are not present in the modules as follows:

BCM

* U1814

* U2099

SDGM

* U1812

* B1453

If any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic

Trouble Code (DTC) List - Vehicle) to diagnose that DTC prior to this diagnostic.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X2 at the SDGM.

2. Verify less than 0.5 volts between the wake up signal circuit terminal 19 and ground.

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

3. Ignition ON, verify B+ between the communication enable signal circuit terminal 16 and ground.

瀚慖f less than the specified value, test the circuit for an open/high resistance. If the circuit tests normal, replace the BCM.

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

Repair Instructions

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

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

Procedures/Wiring Repairs/GMLAN Wiring Repairs)

U209D

DTC U209D

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 U209D 00

- Battery Energy Control Module High Speed Communication Enable Circuit High

Diagnostic Fault Information

Circuit/System Description

Modules connected to the LAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating information

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 874

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. Engine running, measure and record the voltage at the battery terminals.

2. Verify that the battery voltage is 12.6-15.0 V.

瀚慖f the battery voltage is not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and

Inspection/Component Tests and General Diagnostics/Charging System Test).

3. Observe the scan tool of the appropriate module Battery Positive parameter. The reading should be between 12.6-15.0 V.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the appropriate module/sensor.

2. Test for less than 3 Ohms between the ground circuit terminals listed below and ground:

* Terminal H, K83 Parking brake control module

* Terminal 16, K17 Electronic brake control module

* Terminal 1, K19 Suspension control module

* Terminal L X1, K47 Rear differential clutch control module

* Terminal 6, B99 Steering wheel angle sensor

* Terminal 6, B119 Multi-axis acceleration sensor

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

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

* Terminal A, K83 Parking brake control module

* Terminal 1, K17 Electronic brake control module

* Terminal 32, K17 Electronic brake control module

* Terminal 32, K19 Suspension control module

* Terminal M X1, K47 Rear differential clutch control module

* Terminal 5, B99 Steering wheel angle sensor

* Terminal 5, B119 Multi-axis acceleration sensor

瀚慖f the test lamp does not illuminate, test the circuit for an open/high resistance.

4. If all circuits test normal, replace the appropriate module/sensor.

Repair Instructions

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

* Steering Angle Sensor Replacement (See: Sensors and Switches/Sensors and Switches - Steering and Suspension/Sensors and Switches -

Steering/Steering Angle Sensor/Service and Repair/Removal and Replacement)

* Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement (See: Brakes and Traction Control/Antilock Brakes

/ Traction Control Systems/Yaw Rate Sensor/Service and Repair)

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

setup, and programming

C0870

DTC C0870

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 SRX AWD V6-2.8L Turbo Page 802

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

C0277 06, C0277 07, C0890 03, C0890 07

1. Ignition OFF, disconnect the harness connector at the B22 brake pedal position sensor.

2. Ignition OFF, test for less than 60 ohm between the low reference circuit terminal C and ground.

瀚慖f 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 K9 BCM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A 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 K9 BCM.

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 K9 BCM.

4. Verify that the scan tool Brake Pedal Position Sensor parameter is less than 0.3 V.

瀚慖f greater than the specified range, test the signal circuit terminal B for a short to voltage. If the circuit tests normal, replace the K9 BCM.

5. Connect a 3 A fused jumper wire between the 5 V reference circuit terminal A and the signal circuit terminal B. Verify that the scan tool

Brake Pedal Position Sensor parameter is 4.8-5.2 V

瀚慖f 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

K9 BCM.

6. If all circuits test normal, test or replace the B22 brake pedal position sensor.

C0277 09

1. Replace the B22 BPP sensor.

2. Perform the BPP sensor recalibration procedure. Refer to Brake Pedal Position Sensor Calibration ().

3. Operate the vehicle within the Conditions for Running and Setting the DTC and verify the DTC does not reset.

瀚慖f the DTC resets, replace the K9 BCM.

C0277 4B

1. Verify that the DTC sets under the Conditions for Running and Setting.

2. Perform the BPP sensor recalibration procedure. Refer to Brake Pedal Position Sensor Calibration ().

3. Operate the vehicle within the conditions that the customer experienced and verify the DTC does not reset.

瀚慖f the DTC resets, replace the B22 BPP sensor.

Repair Instructions

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

* Brake Pedal Position Sensor Calibration ()

* Brake Pedal Position Sensor Replacement ()

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

C0280

DTC C0280

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 SRX AWD V6-2.8L Turbo Page 933

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

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

Repairs/Wiring Repairs)

DTC Type Reference

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

(DTC) Type Definitions)

Scan Tool Reference

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

Circuit/System Testing

1. Ignition OFF, disconnect harness connector of the B47 fuel pressure sensor.

2. Ignition OFF, test for less than 1.0 ohm between the low reference circuit terminal 2 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 K27

fuel pump control module.

3. 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 K27 fuel pump 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 K27 fuel

pump control module.

4. If all circuits test normal, replace the B47 fuel pressure sensor.

Repair Instructions

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

* Fuel Pressure Sensor Replacement - Fuel Feed Pipe (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pressure

Sensor/Switch/Service and Repair/Fuel Pressure Sensor Replacement - Fuel Feed Pipe)

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

and programming

P06D1

DTC P0602-P0606, P0610, P0614, P0630, P06D1, P160D, P160E, P161C, or P2610 (ECM, LAU/LBW)

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 P0602

- Control Module Not Programmed

DTC P0603

- Control Module Long Term Memory Reset

DTC P0604

- Control Module Random Access Memory Performance

DTC P0605

- Control Module Programming Read Only Memory Performance

DTC P0606

- Control Module Processor Performance

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 610

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. Perform the Vehicle Key Relearn procedure. Refer to Replacing Keys (See: Accessories and Optional Equipment/Antitheft and Alarm

Systems/Service and Repair/Replacing Keys).

2. While viewing the scan tool BCM Key Part Number parameter, turn ON the ignition with each of the available vehicle keys. The parameter

should read a Key Part Number with all available keys.

瀚慖f not the specified value, replace the appropriate key.

Repair Instructions

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

Replacing Keys (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Service and Repair/Replacing Keys)

B3101

DTC B3101

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 B3101 00

- Keyless Entry Data Link Circuit

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) communicates with the remote control door lock receiver through the keyless entry serial data circuits. When any

button on the keyless entry transmitter is pressed, the transmitter sends a signal to the remote control door lock receiver. The remote control door

lock receiver sends a function request to the BCM, depending on which button is pressed on the transmitter. The BCM receives the message and

performs the appropriate function.

Conditions for Running the DTC

A button is pressed on the keyless entry transmitter.

Conditions for Setting the DTC

No response is received from the remote control door lock receiver after the BCM requests information from or sends configuration commands to

the remote control door lock receiver.

Action Taken When the DTC Sets

In the case of power failure, the remote control door lock receiver is disabled for 65 seconds, otherwise no action is taken.

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 508

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 appropriate E14B or E14D seat cushion heating element.

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

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit test normal, replace the K29 seat

heating control module.

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

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

the K29 seat heating control module.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K29 seat heating

control module.

4. If all circuits test normal, test or replace the E14 seat cushion heating element.

Component Testing

E14B or E14D Seat Cushion Heating Element

1. Ignition OFF, disconnect the harness connector at the appropriate E14B or E14D seat cushion heating element.

2. Test for 500 Ohms - 300 kOhms between the signal circuit terminal C and the low reference circuit terminal D.

瀚慖f not within the specified range, replace the E14 seat cushion heating element.

Repair Instructions

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

* Driver or Passenger Seat Cushion Heater Replacement (See: Body and Frame/Seats/Seat Temperature Element/Service and Repair/Driver or

Passenger Seat Cushion Heater Replacement)

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

and programming

With Memory A45

DTC B1925 or B2170 (With Memory A45)

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 B1925 02

- Driver Seat Cushion Heater Sensor Circuit Short to Ground

DTC B1925 05

- Driver Seat Cushion Heater Sensor Circuit High Voltage/Open

DTC B2170 02

- Passenger Seat Cushion Heater Sensor Circuit Short to Ground

DTC B2170 05

- Passenger Seat Cushion Heater Sensor Circuit High Voltage/Open

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 716

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 E6 center high mounted stop lamp ON and OFF by applying and releasing the brake pedal. The E6 center high mounted

stop lamp should turn ON and OFF each time the brake pedal is applied and released.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the E6 center high mounted stop lamp.

2. Test for less than 30 ohm between the ground circuit terminal B and ground.

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

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

4. Ignition ON, command the center high mounted stop lamp ON and OFF by applying and releasing the brake pedal. The test lamp should turn

ON and OFF when changing between the selected states.

瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

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

the K9 BCM.

5. If all circuits test normal, replace the E6 center high mounted stop lamp.

Repair Instructions

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

* High Mount Stop Lamp Replacement (See: Lighting and Horns/Center Mounted Brake Lamp/Service and Repair)

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

B3885

DTC B3885 or B3886

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 B3885 02

- Trailer Left Tail Lamp Circuit Short to Ground

DTC B3885 04

- Trailer Left Tail Lamp Circuit Open

DTC B3886 02

- Trailer Right Tail Lamp Circuit Short to Ground

DTC B3886 04

- Trailer Right Tail Lamp Circuit Open

Diagnostic Fault Information

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 966

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

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

Procedures/Connector Repairs/Connector Repairs)

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

Repairs/Wiring Repairs)

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 Testing

Note: Verify that the fuel tank is not empty. Only perform this diagnostic if there is at least 2 gallons of fuel in the fuel tank. Clear the DTC, and

start and run the engine. Verify that the DTC P018B resets before proceeding with the circuit system testing. If the DTC does not reset, refer to

diagnostic aids.

1. Ignition OFF, disconnect the harness connector at the B47 fuel pressure sensor.

2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal 2 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 K27

fuel pump flow control module.

3. Ignition ON, test for 4.8-5.2 V between the B47 fuel pressure sensor 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 K27 fuel pump flow 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 K27 fuel

pump flow control module.

4. Verify the scan tool fuel pressure sensor voltage is less than 1 V.

瀚慖f greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the K27 fuel

pump flow control module.

5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the 5 V reference circuit terminal 3. Verify the scan tool 5 V

reference is greater than 4.8 V.

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 K27 fuel pump flow control module.

6. If all circuits test normal, replace the B47 fuel pressure sensor.

Repair Instructions

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

* Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pressure

Sensor/Switch/Service and Repair/Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail)

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

and programming

P018C

DTC P018B-P018D

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 SRX AWD V6-2.8L Turbo Page 656

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

B3205 00, B3205 39, B3205 42, B3210 00, B3210 39, B3210 42, B3215 39, B3220 39

1. Ignition ON, command the M74 window motor UP and DOWN with a scan tool. The M74 window motor should perform the UP and

DOWN functions.

Note: If the window performs the UP and DOWN functions, clear the DTC

2. Replace the M74 window motor with a M74 window motor compatible for that specific make and model vehicle.

Circuit/System Testing

B3205 4B, B3210 4B

1. Ignition ON, starting with the window completely UP, press and hold the appropriate power window switch until the window is fully open

and continue holding the switch down for approximately 5 seconds after the window is completely open.

2. Pull the power window switch up until the window is fully closed and continue holding the switch up for approximately 5 seconds after the

window is completely closed.

3. Command the window to express UP and express DOWN by pressing the window switch past the first detent and releasing and then pulling

the window switch past the first detent and releasing. The window should perform the express UP and express DOWN functions.

瀚慖f the M74 window motor does not perform as specified and the DTC resets, replace the M74 window motor.

Repair Instructions

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

* Front Side Door Window Regulator Replacement (See: Windows and Glass/Windows/Service and Repair/Front Side Door Window

Regulator Replacement)

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

Regulator Motor Replacement)

B3410

DTC B3410 or B3420

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 B3410 01

- Automatic Headlamp Leveling Control Module Front Axle Sensor Signal Circuit Short to Battery

DTC B3410 06

- Automatic Headlamp Leveling Control Module Front Axle Sensor Signal Circuit Low Voltage/Open

DTC B3420 01

- Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal Circuit Short to Battery

DTC B3420 06

- Automatic Headlamp Leveling Control Module Rear Axle Sensor Signal Circuit Low Voltage/Open

Diagnostic Fault Information

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2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 587

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, park lamps ON, vary the interior backlight dimming from low to full bright by using the dimmer switch. The LED on all components

should dim and then become full bright.

Circuit/System Testing

Note: Each component on backlighting control circuit may need to be disconnected to isolate a short to voltage or short to ground. Use the

schematic to identify the following:

* All backlighting components that the vehicle is equipped with

* Component locations on the backlighting dimming control circuit

* Each component's control and ground circuit terminals

1. Ignition OFF, disconnect the harness connector at any component on the interior backlighting control circuit.

2. Scan tool disconnected, interior lamps OFF, doors CLOSED, test for less that 10 Ohms between the ground circuit terminal and ground.

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

3. Connect a test lamp between the control circuit terminal and ground.

4. Ignition ON, command the LED Backlight Dimming ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing

between the commanded states.

瀚慖f the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

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

the K9 BCM.

5. If all circuits test normal, test or replace the appropriate component.

Repair Instructions

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

* Refer to the appropriate replacement procedure for the component causing the condition.

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

B2645

DTC B2645

Diagnostic Instructions

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

Check - Vehicle) prior to using this diagnostic procedure.

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

overview of the diagnostic approach.

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

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2645 03

- Ambient Light Sensor Circuit Low Voltage

DTC B2645 07

- Ambient Light Sensor Circuit High Voltage

Diagnostic Fault Information