2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3147

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3147

Circuit/System Testing

1. Ignition OFF, test for less than 1.0 ohm between the accessory DC power control module case and ground strap.

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

2. Disconnect harness connector X3 of the accessory DC power control module.

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal A and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for an open/high resistance. If the circuit fuse is open, test the control circuits of the

accessory DC power control module for a short to ground.

4. Ignition OFF, disconnect harness connector X1 of the accessory DC power control module.

5. Ignition ON, verify that a test lamp illuminates between the wake up signal circuit terminal 3 and ground.

瀚慖f the test lamp does not illuminate, test the wake up signal circuit for an open/high resistance or a short to ground. If the circuit tests

normal, replace the serial data gateway module.

6. If all circuits test normal, replace the accessory DC power control module.

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)

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

programming

U0184

DTC U0100-U02FF (with HP2)

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

Refer to Control Module U Code List (See: Diagnostic Trouble Code Descriptions/Control Module U Code List).

Diagnostic Fault Information

Circuit/System Description

The serial data circuit is the means by which the control modules in the vehicle communicate with each other. Once the scan tool is connected to the

serial data circuit through the DLC, the scan tool can be used to monitor each control module for diagnostic purposes and to check for diagnostic

trouble codes (DTCs). When the ignition switch is in RUN, each control module communicating on the serial data circuit sends a state of health