Liftgate Ajar Indicator Malfunction (Manual Liftgate)

/ 9-4x / 2011 / 8. Body / Doors and locks / Fault diagnosis, fault symptoms / Liftgate Ajar Indicator Malfunction (Manual Liftgate)

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 Switch Signal	1	2	2	-
Ground	-	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 illuminates the rear access open message when the gate is open. The instrument panel cluster 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 8.1 km/h (5 mph), a chime will sound.

Diagnostic Aids

Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power for the procedure.

Reference Information

Schematic Reference

Liftgate Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

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

Circuit/System Testing

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

2.	Test for less than 1 Ω between the ground circuit terminal 5 and ground.

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

4.	Ignition ON, verify the scan tool Rear Closure Ajar Switch parameter is Inactive.

5.	If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the K9 BCM.

6.	Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Rear Closure Ajar Switch parameter is Active.

7.	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 K9 BCM.

8.	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.

3.	If not the specified value, replace the liftgate latch assembly.

4.	Test for less than 1.0 Ω between the signal terminal 6 and the ground terminal 5 with the switch in the closed position.

5.	If greater than the specified range, replace the liftgate latch assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Liftgate Latch Replacement

•	Control Module References for BCM replacement, setup, and programming

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