The door ajar indicator system function is to alert the vehicle operator when a vehicle door has inadvertently been left ajar or open. Failure of the door ajar indicator system does not affect door locks or any other vehicle system.

The driver information center (DIC) located at the bottom of the instrument panel cluster (IPC), illuminates the DOOR AJAR indicator when the body control module (BCM) detects that one of the doors is open. The IPC receives a GMLAN serial data message from the BCM indicating the door ajar status. If this message is displayed and the vehicle speed is greater than 4.8 km/h (3 mph), a chime will sound.