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 provide 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 (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 8.1 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
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Liftgate Ajar Indicator Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, verify that the scan tool Rear Closure Ajar Sw. parameter changes between Active and 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 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 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 1.0 ohm 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
Liftgate Ajar Indicator Malfunction Power 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 |
|---|---|---|---|---|
Ratchet Switch Signal | 1 | B153A 08 | 2 | -- |
1. Liftgate Ajar Indicator Always On 2. Power Liftgate Inoperative | ||||
Circuit/System Description
The driver information center (DIC) illuminates the LIFTGATE OPEN message 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 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.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Liftgate 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 LGM Latch Ratchet 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 assembly.
- Ignition ON, verify the scan tool LGM Latch Ratchet Sw. parameter is Inactive.
- Install a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool LGM Latch Ratchet Sw. parameter is Active.
- If all circuits test normal, replace the liftgate latch assembly.
| ⇒ | If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the LGM. |
| ⇒ | 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 LGM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for LGM replacement, setup, and programming
