Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

The roof/door module grounds the rear compartment lid release relay control circuit based on rear compartment lid release switch signal from the interior rear compartment lid release switch. The rear compartment lid release actuator is supplied battery voltage via the BED RELEASE fuse through the BED RELEASE relay. When the interior rear release switch is pressed, the rear compartment lid release switch signal circuit is grounded. This input will request the roof/door module to ground the rear compartment lid release relay control circuit, which will switch the BED RELEASE relay. With the relay contacts close, battery voltage is supplied to the rear compartment lid release actuator, opening the rear compartment.

If the rear compartment present switch is open, indicating to the roof/door module the rear compartment lid has been removed, lid release function will be disabled.

Schematic Reference

Body Rear End Schematics

Connector End View Reference

Body Rear End Connector End Views

Electrical Information Reference

Scan Tool Reference

Press the interior rear compartment lid release switch. The rear compartment lid should release.

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

⇒	If greater than 1 ohm, test the ground circuit for an open/high resistance.

3. Install a 3-amp fused jumper wire between the lid release switch signal circuit and ground. With a scan tool, verify the rear compartment lid release switch parameter is ACTIVE.

⇒	If not ACTIVE, test the lid release switch signal circuit for a short to voltage or an open/high resistance. If circuit tests normal, replace the roof/door module.

4. With a scan tool, verify the rear compartment lid release switch parameter cycles between ACTIVE and INACTIVE with each press of the lid release switch.

⇒	If the parameter does not cycle, replace the rear compartment lid release switch.

5. Remove the bed release relay.
6. Verify that a test lamp illuminates between the relay coil voltage supply circuit and ground.

⇒	If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance. If the bed release fuse is open, test the relay switch control circuit for a short to ground. If the circuit tests normal, test or replace the bed release relay.

7. Verify that a test lamp illuminates between the relay switch voltage supply circuit and ground.

⇒	If the test lamp does not illuminate, repair the relay switch voltage supply circuit for a short to ground or an open/high resistance.

8. Disconnect the harness connector at the rear compartment lid release actuator.
9. Test for less than 1 ohm of resistance between the release actuator ground circuit and ground.

⇒	If greater than 1 ohm, test the ground circuit for an open/high resistance

10. Connect the harness connector at the rear compartment lid release actuator.
11. Connect a 5-amp fused jumper wire between the relay switch voltage supply circuit and the relay switch control circuit. Verify the rear compartment lid release actuator actives.

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

12. Connect a test lamp between the relay control circuit and the relay coil voltage supply circuit.
13. Using a scan tool, command the rear compartment lid release output ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp remains ON all the time, test for a short to ground on the rear compartment lid release relay control circuit. If the circuit tests normal, replace the roof/door module.

⇒	If the test lamp remains OFF all the time, test for a short to voltage or an open/high resistance on the rear compartment lid release relay control circuit. If the circuit tests normal, replace the roof/door module.

14. If all circuits test normal, test or replace the bed release.

Rear Compartment Lid Release Switch

1. Ignition OFF, disconnect the harness connector at the lid release switch.
2. Test for infinite resistance between the signal terminal and the voltage supply terminal with the switch in the open position.

⇒	If less than infinite resistance, replace the lid release switch.

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

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

Bed Release Relay

1. Ignition OFF, disconnect the BED RELEASE relay.
2. Test for 70-100 ohms of resistance between terminals 85 and 86.

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

3. Test for infinite resistance between the following terminals:

•

30 and 86

•

30 and 87

•

30 and 85

•

85 and 87

⇒	If less than infinite, replace the relay.

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

⇒	If greater than 2 ohms, replace the relay.

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.