Grand Cherokee 2WD V8-4.7L VIN N (2000)
Lock Cylinder Switch: Description and Operation
The driver cylinder lock switch is integral to the key lock cylinder inside the driver side front door. The driver cylinder lock switch is a normally-open
momentary switch that is hard wired between a body ground and the Driver Door Module (DDM) through the front door wire harness, and closes a path
to ground through an internal resistor when the lock cylinder is rotated to the unlock position.
The driver cylinder lock switch cannot be adjusted or repaired and, if faulty or damaged, the driver side front door lock cylinder must be replaced.
The driver cylinder lock switch is actuated by the key lock cylinder when the key is inserted in the lock cylinder and turned to the unlock position. The
driver cylinder lock switch closes a path to ground through an internal resistor for the DDM when the driver door key lock cylinder is in the lock or
unlock position, and opens the ground path when the lock cylinder is in the neutral position. 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 cylinder lock switch unlock status message is used by the BCM as an input for Vehicle Theft Security System (VTSS) operation.
