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

The rear compartment lid can be released by operating the rear compartment lid release switch or by pressing the rear compartment release button on the remote keyless entry transmitter. The gear selector may be in any position, but the vehicle speed must equal 0 for the rear compartment lid to release.

When the ignition is ON, the body control module (BCM) supplies battery positive voltage to the rear compartment lid ajar switch through the rear compartment lid ajar switch signal circuit. When the rear compartment lid is opened, the signal circuit is connected to ground through the rear compartment lid ajar switch ground circuit and the voltage is pulled low within the BCM. In response, the BCM sends a low speed GMLAN serial data message to the driver information center (DIC) in the instrument panel cluster (IPC) to illuminate the rear compartment lid ajar indicator.

Schematic Reference

Body Rear End Schematics

Connector End View Reference

Body Rear End Connector End Views

Electrical Information Reference

Scan Tool Reference

The rear compartment lid ajar indicator should illuminate when the lid is opened and go off when the lid is closed.

1. With the ignition OFF, disconnect the harness connector of the rear compartment lid ajar switch.
2. With the ignition ON, connect a fused jumper wire between the rear compartment lid ajar switch signal circuit and the ground circuit of the harness connector.

⇒	If the rear compartment indicator illuminates, replace the rear compartment lid ajar switch.

⇒	If the rear compartment lid ajar indicator does not illuminate, test the rear compartment lid ajar switch signal and ground circuits for an open or a high resistance.

3. If all circuits/connections test normal, replace the driver information center (DIC).

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