Trunk Release Inoperative
Trunk Release Inoperative
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
Circuit/System Description
The rear compartment release circuit operates as follows; battery positive voltage is supplied to the rear compartment lid lock release actuator causing the actuator to energize releasing the rear compartment lid. The rear compartment may be released with the dash mounted rear compartment release switch or with the keyless entry fob. The ignition must be in the OFF or ACCESSORY positions for the rear compartment to be released with a keyless entry transmitter fob (RFA).
Circuit/System Verification
1. Ignition ON, observe the scan tool Trunk Release Switch parameter while pressing the Rear Compartment Lid Release Switch. The reading should change between Active and Inactive.
• If the reading does not change between Active and Inactive, refer to Rear Compartment Lid Switch Malfunction.
2. Command the Trunk Release with a scan tool. The Rear Compartment Lid Release Actuator should release the trunk lid.
• If the trunk latch does not does not release, refer to Rear Compartment Lid Malfunction.
Circuit/System Testing
Rear Compartment Lid Release Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the Rear Compartment Lid Release Switch.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal D and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the circuit terminal D for a short to ground.
3. If all circuits test normal, test or replace the Rear Compartment Lid Release Switch
Rear Compartment Lid Release Malfunction
1. Ignition OFF, disconnect the harness connector 4 at the Rear Compartment Lid Latch.
2. Test for less than 1.0 ohm of resistance between the Rear Compartment Lid Latch ground circuit terminal 3 and ground
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal 4 and ground.
4. Command the Trunk Release ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the BCM.
• If the test lamp is always OFF and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, test or replace the Rear Compartment Lid Latch.
5. If all circuits test normal, test or replace the Rear Compartment Lid Latch.
Component Testing
Rear Compartment Lid Release Actuator
1. Ignition OFF, disconnect the harness connector at the Rear Compartment Lid Release Actuator.
2. Install a 15-amp fused jumper wire between the control circuit terminal 4 and 12 volts. Install a jumper wire between the ground circuit terminal 3 and ground. Verify the rear compartment lid release actuator activates.
• If the actuator does not perform as specified, replace the rear compartment lid release actuator.
Rear Compartment Lid Release Switch
1. Ignition OFF, disconnect the harness connector at the Rear Compartment Lid Release Switch.
2. Test for infinite resistance between the signal terminal D and the ground circuit terminal A with the switch in the open position.
• If not the specified value, replace the Rear Compartment Lid Release Switch.
3. Test for less than 2.0 ohms between the signal terminal D and the ground circuit terminal A with the switch in the closed position.
• If greater than the specified range, replace the Rear Compartment Lid Release Switch.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
* Rear Compartment Lid Latch Replacement
* Rear Compartment Lid Switch Replacement
* Control Module References for BCM replacement, setup, and programming Programming and Relearning