Liftgate/Liftgate Window Ajar Indicator Malfunction
Liftgate/Liftgate Window Ajar Indicator Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The liftglass ajar switch is normally open when the liftglass is fully closed. When the liftglass is opened, the ajar switch contacts close providing a path to ground. The instrument panel cluster (IPC) receives a serial data message from the LGM indicating the liftglass ajar status and the driver information center (DIC) located at the bottom of the IPC, illuminates the rear access open message.
The liftgate module (LGM) detects the liftgate ratchet switch is closed to ground indicating the liftgate is open. The IPC receives a serial data message from the LGM indicating the liftgate ajar status and the driver information center (DIC) located at the bottom of the IPC, illuminates the rear access open message.
Reference Information
Schematic Reference
* Liftgate Schematics Liftgate Schematics
* Release Systems Schematics Release Systems Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Door Ajar Indicator Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearningfor scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool LGM Latch Ratchet Sw. and the Liftgate Ajar Switch parameters while opening and closing liftgate and the liftglass. The parameters should change between Active and Inactive.
If the LGM Latch Ratchet Sw parameter changes but the Liftgate Ajar Switch does not change, refer to the Liftglass Ajar Switch. Malfunction.
If the LGM Latch Ratchet Sw and Liftgate Ajar Switch parameters do not change, refer to Liftgate Latch Assembly Malfunction.
Circuit/System Testing
Liftglass Ajar Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the liftglass latch assembly.
2. Test for less than 5 Ohms between the ground circuit terminal 3 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Liftgate Ajar Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the LGM.
4. Install a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Liftgate Ajar Switch parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the LGM.
5. If all circuits test normal, test or replace the liftglass latch assembly.
Liftgate Latch Assembly Malfunction
1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Ignition ON, verify the scan tool LGM Latch Ratchet Sw. parameter is Inactive.
• If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the LGM.
3. Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool LGM Latch Ratchet Sw. parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the LGM
4. If all circuits test normal, test or replace the liftgate latch assembly.
Component Testing
Liftglass Latch Assembly
1. Ignition OFF, disconnect the harness connectors at the liftglass latch assembly.
2. Test for infinite resistance between the signal terminal 4 and ground terminal 3
• If not the specified value, replace the liftglass latch assembly.
3. Test for less than 2 Ohms between the signal terminal 4 and ground terminal 3 with the switch in the closed position
• If greater than the specified range, replace the liftglass latch assembly.
Liftgate Latch Assembly
1. Ignition OFF, disconnect the harness connectors at the liftgate latch assembly.
2. Test for infinite resistance between the signal terminal 6 and the low reference terminal 2.
• If not the specified value, replace the liftgate glass latch.
3. Test for less than 2 Ohms between the signal terminal 6 and the low reference terminal 2 with the switch in the closed position
• If greater than the specified range, replace the liftgate latch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Programming and Relearningfor LGM replacement, setup, and programming