2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3186

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3186

1. Perform the High Voltage Disabling (See: Hybrid Drive Systems/Battery System, Hybrid Drive/Testing and Inspection/Initial Inspection

and Diagnostic Overview/High Voltage Disabling) procedure.

2. Ignition OFF, disconnect harness connector X1 of the BECM.

3. Reconnect the 12-volt battery.

4. Ignition OFF and scan tool disconnected, test for less than 1 volt between wake up signal terminal 13 and ground.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.

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 module replacement, setup, and programming

U0210

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

(SOH) message to ensure that the control module is operating properly. When a control module stops communicating on the serial data circuit, for

example if the module loses power or ground, the SOH message it normally sends on the serial data circuit disappears. Other control modules on

the serial data circuit, which expect to receive that SOH message, detect its absence; those control modules in turn set a DTC associated with the

loss of SOH of the non-communicating control module. The DTC is unique to the control module which is not communicating and one or more

control modules may set the same exact code. A loss of serial data communications DTC does not represent a failure of the control modules that

contain the stored code.

Conditions for Running the DTC

The system voltage is between 9-16 V.

Conditions for Setting the DTC

A supervised periodic message that includes the transmitter module availability has not been received.