GM Service Manual Online
For 1990-2009 cars only

Door Ajar Indicator System Components

The door ajar indicator system consists of the following components.

    â€¢ The driver door module (DDM)
    â€¢ The passenger front door module (PDM)
    â€¢ The body control module (BCM)
    â€¢ The instrument panel cluster (IPC)
    â€¢ The driver information center (DIC)
    â€¢ The driver door ajar switch
    â€¢ The passenger door ajar switch
    â€¢ The left rear door ajar switch
    â€¢ The right rear door ajar switch

Driver Door Ajar And Passenger Door Ajar

The DDM and PDM receive a discrete input from the respective door ajar switch to indicate the status of the door. The DDM or PDM then communicates this status to the IPC via class 2 message. The IPC, upon receipt of this class 2 message, will illuminate the appropriate door ajar message in the DIC and also send a class 2 message to the radio to activate the door ajar audible warning when the following conditions are met:

    â€¢ The transmission is removed from PARK
    â€¢ The vehicle speed is greater then 8.05 km/h (5 mph)

Left Rear Door Ajar And Right Rear Door Ajar

The BCM receives a discrete inputs from both the left and right rear door ajar switches to indicate the status of the doors. The BCM then communicates this status to the IPC via class 2 message. The IPC, upon receipt of this class 2 message, will illuminate the appropriate door ajar message in the DIC and also send a class 2 message to the radio to activate the door ajar audible warning when the following conditions are met:

    â€¢ The transmission is removed from PARK
    â€¢ The vehicle speed is greater then 8.05 km/h (5 mph)