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
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 Rear Closure Ajar Sw. parameter while opening and closing the liftgate. The parameter should change between Active and Inactive.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the liftgate latch.
- Test for less than 1 ohm between the ground circuit terminal 5 and ground.
- Ignition ON, verify the scan tool Rear Closure Ajar Sw. parameter is Inactive.
- 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 all circuits test normal, test or replace the liftgate latch.
| ⇒ | If greater than the specified value, 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.
- 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. |
| ⇒ | 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
