Door Ajar Switch

The door ajar switches are integral to the door latch mechanism. The front door ajar switches are actuated by the front door latch mechanisms, and are hard wired between a body ground and the Driver Door Module (DDM) or the Passenger Door Module (PDM). The rear door ajar switches are actuated by the rear door latch mechanisms, and are hard wired between a body ground and the Body Control Module (BCM) through the rear door and body wire harnesses.

The door ajar switches cannot be adjusted or repaired and, if faulty or damaged, the door latch unit must be replaced.for the service procedures. For complete circuit diagrams, refer to the appropriate wiring information.

The front door ajar switches close a path to ground for the DDM or the PDM when a front door is opened, and opens the ground path when a front door is closed. The rear door ajar switches close a path to ground for the BCM when a rear door is opened, and opens the ground path when a rear door is closed. The DDM, PDM, or BCM read the switch status then send the proper switch status messages to other modules over the Programmable Communications Interface (PCI) data bus network. The door ajar switch status message is used by the BCM as an input for Vehicle Theft Security System (VTSS) operation.