For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Liftgate Ajar Signal | 1 | 2 | -- | --
Liftgate Release Actuator Ground | -- | 2 | 2 | --
1. Liftgate Ajar Indicator Always On 2. Liftgate Ajar Indicator Inoperative

### 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.

### Reference Information

#### Schematic Reference

Door Lock/Indicator Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Door Ajar Indicator Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References 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 between Active and Inactive.

### Circuit/System Testing

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

### Component Testing

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

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for BCM replacement, setup, and programming