2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 904

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 904

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

* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related

Diagnostic Procedures/MP 3023/3024-NQH - Transfer Case/Transfer Case High/Low Clutch Reset) for Motor Learn Procedure

* Four-Wheel Drive Does Not Engage (See: Transmission and Drivetrain/Differential Assembly/Testing and Inspection/Front Drive

Axle/Four-Wheel Drive Does Not Engage)

* Front Drive Axle Clutch Fork Inspection (See: Transmission and Drivetrain/Differential Assembly/Differential Lock/Service and

Repair/Front Drive Axle Clutch Fork Inspection)

* Transfer Case Assembly Replacement (See: Transmission and Drivetrain/Transfer Case/Service and Repair/Removal and Replacement/MP

3023/3024-NQH - Transfer Case/Transfer Case Assembly Replacement)

MP 3010-NP0 - Transfer Case

DTC C0379

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 C0379 01

- Front Axle System Short to Battery

DTC C0379 02

- Front Axle System Short to Ground

DTC C0379 04

- Front Axle System Open Circuit

DTC C0379 08

- Front Axle System Signal Invalid

Diagnostic Fault Information

Circuit/System Description

The front axle control circuit consists of an electric motor actuator which engages and disengages the front axle. The front axle actuator motor

consists of a permanent magnetic motor, a worm gear controlled plunger, a front axle switch and an electronic control circuit within the actuator

assembly.

The front axle actuator consists of the following circuits:

* An Ignition 1 voltage circuit

* An axle switch signal circuit

* An axle actuator control circuit

* A ground circuit

When a shift to 4WD Auto or 4WD HI is requested, the transfer case shift control module (TCCM) engages the front axle by grounding the front

axle control circuit through a current limiting driver.

Conditions for Running the DTC