2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 291

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 291

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Defogger Schematics (See: Windows and Glass/Heated Glass Element/Diagrams/Electrical Diagrams)

Connector End View Reference

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

Description and Operation

Rear Window Defogger Description and Operation (See: Windows and Glass/Windows/Description and Operation/Rear Window Defogger

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

Command the Rear Defog Request ON and OFF with the scan tool. The rear window defogger should turn ON and OFF when changing between

the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the REAR DEFOG relay.

2. Test for less than 1 ohm between the ground circuit terminal 85 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 86 and ground.

4. Ignition ON, command the defogger grid ON and OFF by pressing and depressing the rear defogger switch. 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 HVAC control module.

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 HVAC control module.

5. If all circuits test normal, test or replace the REAR DEFOG relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the REAR DEFOG relay.

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

瀚慖f 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.

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 746

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 746

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)

Connector End View Reference

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

Description and Operation

Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems)

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, with the turn signal switch in the left position, observe the function of the E4LF turn signal lamp-left front and the E4Y turn

signal repeater lamp-left. Each lamp should flash ON and OFF.

2. With the turn signal switch in the right position, observe the function of the E4RF turn signal lamp-right front and the E4Z turn signal

repeater lamp-right. Each lamp should flash ON and OFF.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate turn signal lamp.

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

* E4Y turn signal repeater lamp-left terminal 2

* E4Z turn signal repeater lamp-right terminal 2

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

3. Disconnect the inline harness connector at the appropriate E4LF turn signal lamp-front listed below:

* E4LF turn signal lamp-left front X115 (Without TT6/TT7/TT8)

* E4LF turn signal lamp-left front X111 (With TT6/TT7/TT8)

* E4RF turn signal lamp-right front X116 (Without TT6/TT7/TT8)

* E4RF turn signal lamp-right front X112 (With TT6/TT7/TT8)

4. Connect a test lamp between the control circuit terminal listed below and ground.

* E4LF turn signal lamp-left front terminal J

* E4RF turn signal lamp-right front terminal J

* E4Y turn signal repeater lamp-left terminal 1

* E4Z turn signal repeater lamp-right terminal 1

5. Command the appropriate Turn Signal Lamp 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.

6. If all circuits test normal, replace the turn signal lamp.

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 721

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 721

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 40 ignition cycles.

Reference Information

Schematic Reference

Trailer Connector/Provision Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System

Diagram/Trailer Connector/Provision Schematics)

Connector End View Reference

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

Description and Operation

Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems)

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 function of the left trailer turn signal lamp and the right trailer turn signal lamp while commanding the Left Trailer Turn

Signal Lamp and the Right Trailer Turn Signal Lamp ON and OFF with a scan tool. The left trailer turn signal lamp and the right trailer turn signal

lamp should turn ON and OFF while changing between the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the K68 trailer lighting control module.

2. Test for infinite resistance between the control circuit terminal listed below and ground:

* Right trailer turn signal lamp control terminal 2

* Left trailer turn signal lamp control terminal 17

瀚慖f less than the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the X88 trailer connector.

3. Test for less than 1 ohm between the control circuit terminals listed below:

* Control terminal 2 at the K68 trailer lighting control module and control terminal 4 at the X88 trailer connector.

* Control terminal 17 at the K68 trailer lighting control module and control terminal 1 at the X88 trailer connector.

瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance.

4. If all the circuits test normal, replace the K68 trailer lighting control module.

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 trailer brake control module replacement,

programming and setup

Without U4G

DTC B3887 or B3888 (Without U4G)

Diagnostic Instructions