The door ajar and trunk ajar indicator system consists of the following components:

The body control module (BCM) receives an input from both door switches (coupe) or all four door ajar switches (sedan), the driver, front passenger, left rear, and right rear. The door ajar switches are normally open when the doors are fully closed. When a door is opened, the door ajar switch contacts close providing a path to ground. The driver information center (DIC) on the instrument panel cluster (IPC), illuminates the door ajar message when the one of the doors is open. The IPC receives a serial data message from the BCM, indicating the door ajar status. If this message is displayed and the vehicle speed is greater than 8 km/h (5 mph), a chime will sound.

The body control module (BCM) receives a discrete input from the trunk ajar switch to indicate the status of the trunk. The BCM then communicates this status to the instrument panel cluster (IPC) via GMLAN serial data. The IPC, upon receipt of this message, will illuminate the trunk ajar message in the driver information center (DIC) and also send a GMLAN serial data message to the radio to activate the trunk ajar audible warning when the following conditions are met: