DOOR

The door ajar switches are actuated by the mechanisms internal to the door latch. When a door is closed and properly latched, its door ajar switch is an open circuit. When a door is open or only partially latched, the door ajar switch is a closed circuit.

The door ajar switches are hard wired between a body ground and the Body Control Module (BCM). The front door ajar switches are connected to the BCM through a driver or passenger door ajar switch sense circuit, while the rear door ajar switches are connected to the BCM through a left or right rear door ajar switch sense circuit. The BCM reads the door ajar switch status through an internal pull-up, then sends electronic door ajar switch status messages to the ElectroMechanical Instrument Cluster (EMIC) over the Programmable Communications Interface (PCI) data bus and uses these inputs to control many electronic functions and features of the vehicle.

The door ajar switches as well as the hard wired inputs and outputs of the switches may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.