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

When the ignition is ON, the body control module (BCM) supplies battery positive voltage to the liftgate ajar switch through the liftgate ajar switch signal circuit. When the liftgate is opened, the signal circuit is connected to ground through the liftgate ajar switch ground circuit and the voltage is pulled low within the BCM. In response, the BCM sends a low speed serial data message to the driver information center (DIC) in the instrument panel cluster (IPC) to illuminate the GATE AJAR indicator.

Reference Information
Schematic Reference

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 Relearning)for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Liftgate Ajar Switch parameter while opening and closing the liftgate. The parameter should change between Ajar and Closed.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the liftgate door latch.
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. Ignition ON, verify the scan tool Liftgate Ajar Switch parameter is Closed.

• 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 Liftgate Ajar Switch parameter is Ajar.

• 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 door latch.

Component Testing

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

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 door latch.

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