Door Ajar Indicator

Each door lock contains a door ajar switch. The door ajar switch(es) are an integral part of each door lock system and are not serviced separately. The body control module (BCM) supplies voltage to each door ajar switch. Ground for each door ajar switch is provided by a ground circuit connected to a ground stake. When the doors are closed, the door ajar switch contacts are open. When a door is ajar, the door ajar switch contacts are closed and the BCM interprets the flow of voltage as a discrete input from the door ajar switch. The BCM sends the request to illuminate the corresponding door ajar message, via the serial data circuit to the DIC. The DIC illuminates the appropriate door ajar message based on the serial data message from the BCM.