Liberty Sport 4WD L4-2.4L VIN 1 (2002)
Lock Cylinder Switch: Description and Operation
Fig.1 Door Cylinder Lock Switch
DOOR CYLINDER LOCK SWITCH
Vehicles manufactured for North American markets that are equipped with the optional Vehicle Theft Security System (VTSS) have a door
cylinder lock switch secured to the back of the key lock cylinder inside each front door. The door cylinder lock switch is a resistor multiplexed
momentary switch that is hard wired in series between the door lock switch ground and right or left cylinder lock switch mux circuits of the Body
Control Module (BCM) through the front door wire harness. The door cylinder lock switches are driven by the key lock cylinders and contain two
internal resistors. One resistor value is used for the Lock position, and one for the Unlock position.
The door cylinder lock switches cannot be adjusted or repaired and, if faulty or damaged, they must be replaced.
The door cylinder lock switches are actuated by the key lock cylinder when the key is inserted in the lock cylinder and turned to the lock or unlock
positions. The door cylinder lock switch close a circuit between the door lock switch ground circuit and the left or right cylinder lock switch mux
circuits through one of two internal resistors for the Body Control Module (BCM) when either front door key lock cylinder is in the Lock, or
Unlock positions. The BCM reads the switch status through an internal pull-up, then uses this information as an input for the Vehicle Theft
Security System (VTSS) operation.
The door cylinder lock switches and circuits can be diagnosed using conventional diagnostic tools and methods.
