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.



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 is fully closed. When the liftgate 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) located at the bottom of the IPC, illuminates the rear access open message.


Reference Information
Schematic Reference

Interior Lights Schematics (Interior Lights Schematics)
Connector End View Reference

Component Connector End Views (Component Connector End Views)
Description and Operation

Door Ajar Indicator Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Programming and Relearning (Programming and Relearning)for Scan Tool Information


Circuit/System Verification

1. Ignition ON, with the liftgate fully closed, verify the scan tool rear closure ajar switch parameter is inactive.

• If the rear closure ajar switch parameter is active, refer to the Liftgate Ajar Switch Circuit Test.

2. With the liftgate open, verify the rear closure ajar switch parameter is active.

• If the rear closure ajar switch parameter is inactive, refer to the Liftgate Ajar Switch Circuit Test.

3. If the liftgate ajar switch input to the BCM functions normally replace the IPC.



Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the liftgate ajar switches.
2. Test for less than 1.0 ohm of resistance between the ground circuit terminals A and ground.

• If greater than the specified range, test the affected ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool rear closure ajar switch parameter is inactive.

• If not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3A fused jumper wire between each of the signal circuit terminals B and the ground circuit terminals A. Verify the scan tool rear closure 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 BCM.

5. If all circuits test normal, test or replace the affected liftgate ajar switch.



Repair Instructions

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


Programming and Relearning (Programming and Relearning)for BCM or IPC replacement, programming, and setup.