GM Service Manual Online
For 1990-2009 cars only

Rear Compartment Lid

The rear compartment lid can be opened by operating the rear compartment lid release switch, located on the instrument panel, or by using the manual release located on the rear compartment lid. Battery voltage is supplied to the rear compartment lid release relay through the Main Power fuse. The roof and door module (RDM) receives the rear compartment lid release request via the rear compartment lid release switch signal circuit. The RDM grounds the rear compartment lid release relay coil when a release input is received through the instrument panel (I/P) switch. Grounding the coil causes the rear compartment lid release relay to energize, providing power to the rear compartment lid latch assembly through the rear compartment lid release actuator supply voltage circuit.

As an alternate method of operating the rear compartment, an emergency release handle is accessible from within the rear compartment. When the handle is slightly pulled, it will provide a ground for the bed cover release relay which will cause the actuator to operate and open the rear compartment lid. If the handle is pulled further, it will mechanically open the lid, so even if the battery is discharged or there is an electrical concern, the emergency release handle will mechanically open the lid.

Bed Cover Ajar Message

The information processing center (IPC) will display the Bed Cover Ajar message in the driver information center (DIC) if you are trying to operate the power folding top, and the RDM detects that the rear compartment lid is not completely closed. The IPC receives a class 2 message from the RDM requesting that the Bed Cover Ajar message be displayed. The RDM receives an input from the rear compartment lid ajar switch through the rear compartment lid ajar switch signal circuit to monitor the status of the rear compartment lid. The IPC sends a class 2 message to the radio in order to activate an audible warning.