Liftgate Ajar Indicator Malfunction (Power Liftgate)

Liftgate Ajar Indicator Malfunction (Power Liftgate)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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/System Description

The driver information center (DIC) illuminates the LIFT GATE AJAR indicator when the liftgate module (LGM) detects the liftgate ratchet switch is closed to ground indicating the liftgate is open. The instrument panel cluster receives a GMLAN serial data message from the LGM 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.

Circuit/System Verification

Ignition ON, observe the scan tool LGM Latch Ratchet Sw. parameter while opening and closing liftgate. The reading should change between Active and Inactive.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
2. Ignition ON, verify the scan tool LGM Latch Ratchet 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 LGM.

3. If all circuits test normal, replace the liftgate latch assembly.

Repair Instructions

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