Liftgate/Liftgate Window Ajar Indicator Malfunction
Liftgate/Liftgate Window Ajar Indicator Malfunction
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 REAR ACCESS OPEN message displays and Gate Ajar indicator comes on if the liftgate or liftglass is open while the ignition is in RUN. The IPC receives a class 2 message from the liftgate module (LGM) requesting illumination. The LGM receives discrete inputs from 2 ajar switches to indicate the status of the liftgate. The liftgate and liftglass ajar switches are normally open when the liftgate and liftglass are closed. When the liftgate or liftglass is opened, the ajar switch contacts close providing a path to ground.
Circuit/System Verification
1. Ignition ON, observe the scan tool Liftglass Ajar Switch parameter while opening and closing the liftgate window. The reading should change between Closed and Ajar.
^ If the reading does not change between the specified values, refer to Liftglass Ajar Switch Circuit Test.
2. Observe the scan tool Liftgate Ajar Switch parameter while opening and closing the liftgate. The reading should change between Closed and Ajar.
^ If the reading does not change between the specified values, refer to Liftgate Ajar Switch Circuit Test.
3. If the liftgate and liftglass ajar switch inputs to the LGM function normally replace the IPC.
Circuit/System Testing
Liftglass Ajar Switch Circuit Test
1. Ignition OFF, disconnect the harness connector at the liftglass ajar switch.
2. Test for less than 5.0 ohms between the low reference circuit terminal B and ground.
^ If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal replace the LGM.
3. Ignition ON, verify the scan tool Liftglass Ajar Switch parameter is Closed.
^ If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the LGM.
4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Liftglass Ajar Switch parameter is Ajar.
^ 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.
5. If all circuits test normal, test or replace the liftglass ajar switch.
Liftgate Ajar Switch Circuit Test
1. Ignition OFF, disconnect the X1 harness connector at the liftgate latch.
2. Test for less than 5.0 ohms between the low reference circuit terminal D and ground.
^ If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal replace the LGM.
3. Ignition ON, verify the scan tool Liftgate Ajar Switch parameter is Closed.
^ If not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the LGM.
4. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal D. Verify the scan tool Liftgate Ajar Switch parameter is Ajar.
^ 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.
5. If all circuits test normal, test or replace the liftgate latch.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Liftgate Window Latch Replacement