2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 639
Important: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power (See:
Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Service and Repair/Procedures) for the appropriate procedure.
Whenever the LGM loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the LGM.
Reference Information
Schematic Reference
Liftgate Schematics (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/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 Verification
Ignition ON, command the liftgate to OPEN and CLOSE with the scan tool. The liftgate latch assembly should release the liftgate allowing the
liftgate to open.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Test for less than 5 ohms between the control circuit terminal 1 and ground.
瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace
the LGM.
3. Test for less than 5 ohms between the control circuit terminal 3 and ground.
瀚慖f greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace
the LGM.
4. Connect a test lamp between control circuit terminal 1 and ground.
5. Ignition ON, command the liftgate to OPEN by pressing and releasing the liftgate interior switch. The test lamp should illuminate while
commanding the OPEN state.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the LGM.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the LGM.
6. Ignition OFF, connect a test lamp between the control circuit terminal 3 and ground.
7. Connect a 3A fused jumper wire between the signal circuit terminal 6 and ground.
8. Ignition ON, command the liftgate to CLOSE by pressing and releasing the liftgate interior switch. The test lamp should illuminate while
commanding the CLOSE state.
瀚慖f the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the LGM.
瀚慖f the test lamp is always ON, test the control circuit for a short to voltage, if the circuit tests normal, replace the LGM.
9. If all circuits test normal, test or replace the liftgate latch assembly.
