GM Service Manual Online
For 1990-2009 cars only

Luggage Compartment Description and Operation General

The trunk release system contains the following components:

    • The fuel door/trunk release switch
    • The driver's door switch
    • The driver's door module (DDM)
    • The rear integration module (RIM)
    • The rear fuse block
    • The trunk release relay
    • The rear compartment lid release actuator
    • The valet switch

The RIM operates the relays when it receives a class 2 message from the DDM. The RIM will then verify that the vehicle is in park before releasing either system.

The valet switch is used as a manual override for the system and must be closed in order for the release systems to work properly.

Luggage Compartment Description and Operation Ajar Indicator

Trunk Ajar Indicator

TRUNK AJAR -- 28

The DIC displays the TRUNK AJAR -- 28 indicator when the rear integration module (RIM) detects that the trunk is open or ajar. The DIC receives a class 2 message form the RIM requesting illumination. The IPC sends a class 2 message to the radio in order to activate an audible warning.