Liftgate Ajar Indicator Malfunction

Liftgate 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 Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information






Circuit/System Description

The instrument panel cluster (IPC) illuminates the gate ajar indicator when the body control module (BCM) detects that the liftgate is ajar or open. The IPC receives a serial data message from the BCM requesting illumination. If this message is displayed and the vehicle speed is greater than 8 km/h (5 mph), a chime will sound.

Reference Information

Schematic Reference

Release Systems Schematics Release Systems Schematics

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (MN5)

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. The parameter should change from Active to Inactive while opening and closing the liftgate.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.

2. Test for less than 10 ohms between the ground circuit terminal 5 and ground.

• If greater than the specified range, 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 value, 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 value, 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 latch assembly.

Component Testing

1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.

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 latch assembly.

3. Test for less than 2 ohms 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 latch assembly.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Liftgate Latch Replacement Service and Repair

* Control Module References Programming and Relearning for BCM replacement, setup, and programming