Grand Cherokee 2WD V8-4.7L VIN N (2000)
Door Switch: Description and Operation
The driver door ajar switch is concealed within and integral to the driver side front door latch unit. The driver door ajar switch is actuated by the front
door latch mechanism, and is hard wired between a body ground and the Driver Door Module (DDM) through the driver side front door wire harness.
The driver door ajar switch cannot be adjusted or repaired and, if faulty or damaged, the driver side front door latch unit must be replaced.
The driver door ajar switch closes a path to ground for the DDM when the driver side front door is opened, and opens the ground path when the driver
side front door is closed. The DDM reads the switch status through an internal pull-up, then sends the proper switch status messages to other electronic
modules over the Programmable Communications Interface (PCI) data bus network. The driver door ajar switch status message is used by the Body
Control Module (BCM) as an input for chime warning system operation.
