Liftgate/Liftgate Window Ajar Indicator Malfunction (Manual Liftgate)
Liftgate/Liftgate Window Ajar Indicator Malfunction (Manual Liftgate)
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 Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The BCM receives a discrete input from 2 ajar switches to indicate the status of the liftgate. The liftgate ajar switches are normally open when the liftgate and liftglass are fully closed. When the liftgate or 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 BCM indicating the liftgate ajar status and the driver information center (DIC) will display the REAR ACCESS OPEN message.
Reference Information
Schematic Reference
Release Systems Schematics (Release Systems Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
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 Relearning) for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the liftgate and liftglass. The parameter should change from Inactive to Active.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Test for less than 1 ohm between the ground circuit terminal 5 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Disconnect the harness connector at the liftgate window latch assembly.
4. Test for less than 1 ohm between the ground circuit terminal 3 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
5. Ignition ON, verify the scan tool Rear Closure Ajar Sw. 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 BCM.
6. Connect a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Rear Closure Ajar 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 BCM.
7. Ignition OFF, connect the harness connector at the liftglass window latch assembly.
8. Ignition ON, observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the liftglass. The parameter should change from Inactive to Active
• If the value does not change, test or replace the liftglass window latch assembly.
9. If all circuits test normal, test or replace the liftgate latch assembly.
Component Testing
Liftgate Latch Assembly
1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Test for infinite resistance between the signal terminal 6 and ground terminal 5.
• If not the specified value, replace the liftgate latch assembly.
3. Test for less than 2 ohms between the signal terminal 6 and ground terminal 5 with the switch in the closed position.
• If greater than the specified range, replace the liftgate latch assembly.
Liftgate Window Latch Assembly
1. Ignition OFF, disconnect the harness connector at the liftgate window latch assembly.
2. Test for infinite resistance between the signal terminal 4 and ground terminal 3.
• If not the specified value, replace the liftgate window 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 liftgate window latch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Liftgate Window Latch Replacement (Liftgate Window Latch Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, programming, and setup.