B153B 05
The LGM detects an open/high resistance in the full open switch signal circuit.
Action Taken When the DTC Sets
The power liftgate will not power close.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Diagnostic Aids
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, observe the scan tool LGM Full Open Switch while opening and closing the liftgate. The parameter should change between Active and
Inactive.
Circuit/System Testing
1. Ignition OFF, disconnect the X3 harness connector at the LGM.
2. Ignition ON, verify the scan tool LGM Full Open Switch parameter is Inactive.
锟斤拷 If not the specified value, replace the LGM.
3. Liftgate OPEN, test for less than 1 ohm between the signal circuit terminal 5 and the ground circuit terminal 6.
锟斤拷 If greater than the specified range, replace the liftgate motor assembly.
4. Liftgate CLOSED, test for infinite resistance between the signal circuit terminal 5 and the ground circuit terminal 6.
锟斤拷 If less than the specified value, replace the liftgate motor assembly.
5. If all circuits test normal, replace the LGM.
