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 | -- |
Liftgate Latch Ground | -- | 2 | 2 | -- |
1. Liftgate Ajar Indicator Always On 2. Liftgate Ajar Indicator Inoperative | ||||
Circuit/System Description
The instrument panel cluster (IPC) illuminates the gate ajar indicator when the body control module (BCM) detects that the liftgate is ajar or open. The IPC receives a serial data message from the BCM requesting illumination. 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
Description and Operation
Door Ajar Indicator Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool Int Trunk/Liftglass Sw parameter while opening and closing the liftgate. The parameter should change from Active to Inactive while opening and closing the liftgate.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
- Test for less than 1 ohm between the ground circuit terminal 5 and ground.
- Ignition ON, verify the scan tool Int Trunk/Liftglass Sw parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Int Trunk/Liftglass Sw parameter is Active.
- If all circuits test normal, test or replace the liftgate latch assembly.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
| ⇒ | If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | 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. |
Component Testing
- Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
- Test for infinite resistance between the signal terminal 6 and the ground terminal 5 with the switch in the open position.
- Test for less than 2 ohms between the signal terminal 6 and the ground terminal 5 with the switch in the closed position.
| ⇒ | If not the specified value, replace the liftgate latch assembly. |
| ⇒ | If greater than the specified range, replace the liftgate latch assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for BCM replacement, setup, and programming |
