RAM 2500 Truck 4WD V8-5.2L VIN Y (2000)
Lock Cylinder Switch: Description and Operation
The door lock cylinder switches are mounted to the back of the key lock cylinder inside each front door. They are resistor multiplexed momentary
switches that are hard wired between a body ground and the Central Timer Module (CTM) through the front door wire harnesses. These switches are
driven by the key lock cylinders and contain three internal resistors. One resistor is used for the neutral switch position, one for the lock position and one
for the unlock position.
The door lock cylinder switches cannot be adjusted or repaired and, if faulty or damaged, they must be replaced.
The door lock cylinder 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 lock cylinder switch closes a path to ground through one of three internal resistors for the CTM when the front door key lock
cylinder is in the lock, unlock or neutral positions. The CTM reads the switch status through an internal pull-up, then uses this input and its internal
programming to control the proper Vehicle Theft Security System (VTSS) and power lock system outputs.
