2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2983
Action Taken When the DTC Sets
The control 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
* Circuits to the HPCM are diagnosed only to the PIM connector because the HPCM is replaced as part of the PIM.
* 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)
* Hybrid Controls Schematics ()
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 B137A, B137B or U189A is 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).
Circuit/System Testing
APM
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
