The door ajar indicator system consists of the following components:

The driver window motor and passenger window motor receive a discrete input from the door ajar switch within the respective door latch to indicate the status of the door. The window motor then communicates this status to the instrument cluster via GMLAN message. The instrument panel cluster, upon receipt of this GMLAN message, will illuminate the appropriate door ajar message in the driver information center and also send a GMLAN message to the radio to activate the door ajar audible warning when the vehicle speed is greater then 8 km/h (5 MPH).

The body control module (BCM) receives discrete inputs from both the rear door latches and either the rear compartment lid or liftgate latch to indicate the status of the doors and rear compartment lid or liftgate. The BCM then communicates this status to the instrument cluster via GMLAN message. The instrument panel cluster, upon receipt of this GMLAN message, will illuminate the appropriate door ajar message in the driver information center and also send a GMLAN message to the radio to activate the door ajar audible warning when the vehicle speed is greater then 8 km/h (5 MPH)