2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3146

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3146

The serial data gateway module (SDGM) energizes the wake up signal to activate the accessory DC power control module (APM) when

communication is needed. The SDGM monitors the signal circuit for faults.

Conditions for Running the DTC

* The system voltage is between 9-16 V.

* The ignition in RUN.

Conditions for Setting the DTC

* The APM wake up signal is open.

* The APM does not receive battery voltage.

* The powertrain serial data circuits between the SDGM and the APM are open.

Action Taken When the DTC Sets

The modules is never signaled, therefore the specific subsystems may not function. Depending on the fault, the MIL, battery indicator may

illuminate and several DIC messages may be present.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Diagnostic Aids

* When testing circuits to the SDGM access can be accomplished by removing the instrument panel center trim panel. Note that this procedure

does not allow removal of the SDGM, only access to the connector. Refer to Instrument Panel Center Trim Panel Replacement (Cadillac) (

See: Body and Frame/Interior Moulding / Trim/Dashboard / Instrument Panel/Service and Repair/Instrument Panel Center Trim Panel

Replacement (Cadillac))Instrument Panel Center Trim Panel Replacement (Except Cadillac) (See: Body and Frame/Interior Moulding /

Trim/Dashboard / Instrument Panel/Service and Repair/Instrument Panel Center Trim Panel Replacement (Except Cadillac)).

* Different DTCs may set in different modules along with this DTC depending on where the fault occurs and the vehicle operating conditions

when the fault occurs.

Reference Information

Schematic Reference

* Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical

Diagrams)

* Control Module References (See: Testing and Inspection/Programming and Relearning)

Connector End View Reference

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

Description and Operation

Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information

Bus/Description and Operation)

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)

Circuit/System Verification

1. Verify that DTC B137B or U189A are not present in the SDGM.

瀚慖f any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) to diagnose that DTC prior to this diagnostic.

2. Verify the DTC U0074 is not set.

瀚慖f DTC U0074 is set as a current or history code, refer to DTC U0074 (See: U Code Charts/U0074).