2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3006

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3006

* A short to ground on the serial data circuit between 2 control modules

* A short to ground on the serial data circuit between a control module and a terminating resistor.

Testing the Serial Data Circuits for a Short between the Circuits

1. Ignition OFF, disconnect the harness connectors with the Powertrain High Speed GMLAN serial data circuits at an easily accessible control

module that is not communicating.

2. Ignition OFF for 60 seconds, test for less than 35 ohm between each pair of serial data circuits at the control module connector that was just

disconnected. Verify that one pair of serial data circuits are less than 35 ohm.

瀚慖f each pair of serial data circuits is greater than the specified range, replace the control module that was disconnected.

3. Connect the harness connectors at the control module that was disconnected.

4. Disconnect the harness connectors with the Powertrain High Speed GMLAN serial data circuits at another control module, in the direction of

the circuits shorted together.

5. Ignition OFF for 60 seconds, test for less than 35 ohm between each pair of serial data circuits at the control module connector that was just

disconnected. Verify that one pair of serial data circuits are less than 35 ohm.

瀚慖f each pair of serial data circuits is within the specified range, replace the control module that was just disconnected.

6. Repeat step 3 until one of the following conditions are isolated:

* Serial data circuits shorted together between 2 control modules

* Serial data circuits shorted together between a control module and a terminating resistor

* A shorted terminating resistor

Testing the Serial Data Circuits for an Open/High Resistance

1. Ignition OFF, disconnect the harness connectors with the Powertrain High Speed GMLAN serial data circuits at an easily accessible control

module that is not communicating.

2. Ignition OFF for 60 seconds, test for greater than 100k ohm between each pair of serial data circuits at the control module connector that was

just disconnected. Verify that one pair of serial data circuits are greater than 100k ohm.

瀚慖f each pair of serial data circuits is less than the specified range, replace the control module that was disconnected.

3. Connect the harness connectors at the control module that was disconnected.

4. Disconnect the harness connectors with the Powertrain High Speed GMLAN serial data circuits at another control module, in the direction of

the open circuit.

5. Ignition OFF for 60 seconds, test for greater than 100k ohm between each pair of serial data circuits at the control module connector that was

just disconnected. Verify that one pair of serial data circuits are greater than 100k ohm.

瀚慖f each pair of serial data circuits is less than the specified range, replace the control module that was just disconnected.

6. Repeat step 3 until one of the following conditions are isolated:

* An open/high resistance on the serial data circuit between 2 control modules

* An open/high resistance on the serial data circuit between a control module and a terminating resistor

* An open/high resistance terminating resistor

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 module replacement, setup, and programming

U0100

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.