Liftgate Ajar Indicator Malfunction

Liftgate Ajar Indicator Malfunction

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. Diagnostic System Check - Vehicle Diagnostic Information
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

Diagnostic Fault Information






Circuit/System Description
The body control module (BCM) receives an input from the liftgate ajar assembly. The ajar assembly is normally open when the liftgate is fully closed. When the liftgate is opened, the ajar assembly contacts close providing a path to ground. The driver information center (DIC) illuminates the rear access open message when the gate is open. The instrument panel cluster (IPC) receives a serial data message from the BCM indicating the liftgate ajar status. If this message is displayed and the vehicle speed is greater than 8 km/h (5 mph), a chime will sound.

Circuit/System Verification
Ignition ON, observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the liftgate. The parameter should change between Active and Inactive.

Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the liftgate release actuator.
2. Test for less than 1 ohm between the ground circuit terminal 5 and ground.
^ If greater than the specified value, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Rear Closure Ajar Sw. parameter is Inactive.
^ If not the specified parameter, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Rear Closure Ajar Sw. parameter is Active.
^ If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the BCM.

5. If all circuits test normal, test or replace the liftgate release actuator.

Component Testing

1. Ignition OFF, disconnect the harness connector at the liftgate release actuator.
2. 2 Test for infinite resistance between the signal terminal 6 and the ground terminal 5 with the switch in the open position.
^ If not the specified value, replace the liftgate release actuator.

3. Test for less than 1.0 ohm between the signal terminal 6 and the ground terminal 5 with the switch in the closed position.
^ If greater than the specified range, replace the liftgate release actuator.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure. Diagnostic Repair Verification - Vehicle Diagnostic Information
^ [Liftgate Outside Handle Replacement]
^ [Control Module References] for BCM replacement, setup, and programming Programming and Relearning