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 Door Jamb Switch Ground | -- | 2 | 2 | -- |
1. Liftgate Ajar Indicator Always On. 2. Liftgate Ajar Indicator Inoperative. | ||||
Circuit/System Description
When the ignition is ON, the body control module (BCM) supplies battery positive voltage to the liftgate ajar switch through the liftgate ajar switch signal circuit. When the liftgate is opened, the signal circuit is connected to ground through the liftgate ajar switch ground circuit and the voltage is pulled low within the BCM. In response, the BCM sends a serial data message to the driver information center (DIC) in the instrument panel cluster (IPC) to display the LIFT GATE AJAR message.
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 Liftgate Open Switch 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 door jamb switch.
- Test for less than 1 ohm between the ground circuit terminal D and ground.
- Ignition ON, verify the scan tool Liftgate Open Switch parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool Liftgate Open Switch parameter is Active.
- If all circuits test normal, test or replace the liftgate door jamb switch.
| ⇒ | 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 B 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 door jamb switch.
- Test for infinite resistance between the signal terminal B and the ground terminal D with the switch in the open position.
- Test for less than 2 ohms between the signal terminal B and the ground terminal D with the switch in the closed position.
| ⇒ | If not the specified value, replace the liftgate door jamb switch. |
| ⇒ | If greater than the specified range, replace the liftgate door jamb switch. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, setup, and programming
