2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2979
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)
Special Tools
EL-48900 HEV Safety Kit
Circuit/System Verification
Verify DTC U182A is not set in the serial data gateway module (SDGM).
If the 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.
Circuit/System Testing
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection.
Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures
must be followed.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Ignition OFF, disable the high voltage at the drive motor generator battery. Refer to High Voltage Disabling ().
2. Ignition OFF, disconnect harness connector X4 of the accessory DC power control module.
3. Test for less than 1.0 ohm between the accessory DC power control module connector terminal and ground.
瀚慖f greater than the specified value, test the ground circuit for an open/high resistance.
4. Ignition ON, disconnect harness connector X3 of the accessory DC power control module.
5. Verify that a test lamp illuminates between the accessory DC power control module connector terminal A and ground.
瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
6. Ignition OFF, disconnect harness connector X1 of the accessory DC power control module and the drive motor generator power inverter
module.
7. Test for less than 1.0 ohm at the accessory DC power control module connector and drive motor generator power inverter module connector
between the following connector serial data terminals.
* Accessory DC power control module terminal 1 and drive motor generator power inverter module terminal 24
