2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 905

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 905

* Ignition ON.

* System voltage 10.5-18 V.

Conditions for Setting the DTC

The TCCM monitors the front axle switch signal circuit and the front axle actuator control circuit for unexpected voltages. The DTC sets if the

TCCM detects a high voltage when a low voltage is expected or a low voltage when a high voltage is expected.

Action Taken When the DTC Sets

C0379 01 and C0379 04

* The front axle remains disengaged at all times.

* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.

C0379 02

* The front axle remains engaged at all times.

* The SERVICE 4WD indicator remains illuminated for the remainder of the current ignition cycle.

C0379 08

The front axle remains in current mode.

Conditions for Clearing the DTC

* The TCCM clears the DTC once the conditions for setting the DTC are no longer present.

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

* History DTCs can be cleared using a scan tool.

Diagnostic Aids

The transfer case fill/drain plugs provide a good ground point.

Reference Information

Schematic Reference

Transfer Case Control Schematics (See: Transmission and Drivetrain/Transfer Case/Diagrams/Electrical Diagrams/MP 3010-NP0 - Transfer Case)

Connector End View Reference

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

Electrical Information Reference

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

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

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

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

Repairs/Wiring Repairs)

Scan Tool Reference

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

Special Tools

* EL-49741 - 9 V+ Power Source Harness

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

* J 35616 - GM-Approved Terminal Test Kit

Circuit/System Verification

1. Key ON, engine OFF. Parking brake applied. Transmission in Neutral. Install a scan tool.

2. While monitoring the Front Axle Actuator parameter of the Data Display function on the scan tool, shift the vehicle into 4WD HI. The front

axle actuator parameter should display Active or Engaged. You should also be able to hear the axle actuator engaging.

3. Shift the vehicle into 2WD HI. The Front Axle Actuator parameter should display Inactive or Disengaged. You should also be able to hear

the axle actuator disengaging.

Circuit/System Testing