2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2987
* 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
* If the SDG module becomes inoperative, the drive motor generator battery control module will set DTC U1862 and other modules will set
loss of communication DTCs against the SDG module.
* If serial data is lost between the SDG module and the drive motor generator battery control module multiple modules will set loss of
communication DTCs against the drive motor generator battery control module.
Reference Information
Schematic Reference
* Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical
Diagrams)
* Hybrid Energy Storage 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)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector X2 at the SDG module.
Important: The scan tool must be disconnected and the ignition switch OFF for 30 seconds for proper test results.
2. Ignition OFF and the scan tool disconnected, open and close the driver door, and wait 1 minute.
3. Test for less than 5.0 ohms between the ground circuit terminal 18 X2 and ground.
瀚慖f greater than the specified range, test the circuit for an open/high resistance.
4. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 8 X2 and ground.
瀚慖f the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.
5. Test for 10.5-12.5 volts between the serial data communication enable circuit terminal 16 X2 and ground.
瀚慖f less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
applicable communication/control module.
6. Ignition OFF, connect the harness connector X2 to the SDG module.
7. Ignition OFF, disconnect the harness connector X1 at the SDG module.
8. Ignition ON, test for 2.1-2.5 volts between the high speed GMLAN serial data bus low circuit terminal listed below and ground:
* Terminal 15 X1
* Terminal 16 X1
瀚慖f greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the applicable
communication/control module.
瀚慖f less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the
