When the rear compartment lid release switch is operated, the rear compartment lid release switch signal circuit to the driver door switch assembly (DDSA) is switched to ground. The DDSA communicates via class 2 serial data with the rear integration module (RIM) indicating the request for rear compartment release. The RIM receives the rear compartment lid release switch input and applies ground to the trunk release relay control circuit. This energizes the trunk release relay coil, closing the switch side contacts, allowing battery voltage to be applied to the rear compartment lid release actuator and opening the rear compartment lid. The rear compartment lid ajar switch and rear compartment lid release actuator are provided ground at G402. For more detailed information concerning rear compartment lid release refer to Luggage Compartment Description and Operation .

Schematic Reference

Release Systems Schematics

Connector End View Reference

Vehicle Access Connector End Views

Electrical Information Reference

Scan Tool Reference

1. Ignition ON, command the trunk release relay ON and OFF with a scan tool. The rear compartment lid should release.

⇒	If the rear compartment lid release actuator releases, refer to Rear Compartment Lid Release Switch Malfunction.

⇒	If the rear compartment lid release actuator does not release, refer to Rear Compartment Lid Release Actuator Malfunction.

Rear Compartment Lid Release Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the rear compartment lid release switch.
2. Test for less than 1.0 ohm of resistance between the ground circuit terminal B and ground.

⇒	If greater than 1.0 ohm, test the ground circuit terminal B for an open/high resistance.

3. Ignition OFF, verify that a test lamp does not illuminate between the switch signal circuit terminal A and B+.

⇒	If the test lamp illuminates, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the DDSA.

4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the ground circuit terminal B. Verify the rear compartment lid release actuator activates.

⇒	If the rear compartment lid release actuator does not activate, test the signal circuit terminal A for a short to voltage or an open/high resistance. If circuit tests normal, replace the DDSA.

5. If all circuits test normal, test or replace the rear compartment lid release switch.

Rear Compartment Lid Release Actuator Malfunction

1. Ignition OFF, disconnect the trunk release relay.
2. Ignition ON, verify that a test lamp does not illuminate between the relay switch controlled output circuit terminal R33 and ground.

⇒	If the test lamp illuminates, test the controlled output circuit terminal R33 for a short to voltage.

3. Verify that a test lamp illuminates between the relay coil B+ circuit terminal R31 and ground.

⇒

If the test lamp does not illuminate, test the B+ circuit terminal R31 for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the relay switch controlled output circuit terminal R33 for a short to ground. If the circuit tests normal, test or replace the trunk release relay.

4. Verify that a test lamp illuminates between the relay switch B+ circuit terminal R32 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit terminal R32 for an open/high resistance.

5. Disconnect the harness connector at the rear compartment lid release actuator.
6. Test for less than 1.0 ohm of resistance between the rear compartment lid release actuator ground circuit terminal B and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

7. Connect the harness connector at the rear compartment lid release actuator.
8. Connect a 3-amp fused jumper wire between the relay switch B+ circuit terminal R32 and the relay switch controlled output circuit terminal R33. Verify the rear compartment lid release actuator is activated.

⇒	If the rear compartment lid release actuator does not activate, test the control circuit terminal R33 for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid release actuator.

9. Connect a test lamp between the relay coil B+ circuit terminal R31 and the relay coil control circuit terminal R35.
10. Command the trunk release relay 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 terminal R35 for a short to ground. If the circuit tests normal, replace the RIM.

⇒	If the test lamp is always OFF, test the control circuit terminal R35 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the RIM.

11. If all circuits test normal, test or replace the trunk release relay.

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 ground terminal and the signal terminal with the switch in the open position.

⇒	If less than infinite resistance, replace the switch.

3. Test for less than 1 ohm resistance between the ground terminal and the signal terminal with the switch in the closed position.

⇒	If greater than 1 ohm, replace the rear compartment lid release switch.

Trunk Release Relay

1. Ignition OFF, disconnect the trunk release relay.
2. Test for 60-180 ohms resistance between terminals 85 and 86.

⇒	If the resistance is not within the specified range, replace the trunk release relay.

3. Test for infinite resistance between the following terminals:

•

30 and 86

•

30 and 87

•

30 and 85

•

85 and 87

4. Install a 20-amp fused jumper between relay terminal 85 and 12 volts. Install a jumper between relay terminal 86 and ground. Test for less than 2.0 ohms resistance between terminals 30 and 87.

⇒	If greater than 2.0 ohms, replace the trunk release relay.

Rear Compartment Lid Release Actuator

1. Ignition OFF, disconnect the actuator.
2. Install a 10-amp fused jumper between the voltage supply circuit and 12 volts. Install a jumper between the ground terminal and ground. Verify the actuator activates.

⇒	If the actuator does not activate, replace the rear compartment lid release actuator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.