Door Lock Cylinder: Description and Operation

Both the driver and passenger doors can be locked from either door lock cylinder. When the ignition key is inserted into either door lock and is rotated into the lock position, the linkage moves to rotate a cam in the door latch unit. When the cam in the door latch rotates, it mechanically moves the door latch (in the door in which the key is being used) into the locked position. The other door is locked electronically. As the cam in the door latch unit rotates to mechanically lock the first door, it also closes a switch in that door latch unit that grounds an input to the CSM. This causes the CSM to send 12 volts to one side and grounds the other side oft door lock actuator, which then rotates its cam assembly, locking the remaining door. Only one door can be unlocked from any one door lock cylinder. When the ignition key is inserted into a door lock cylinder and is rotated into the unlock position, the linkage moves to rotate a cam in the door latch unit. When the cam in the door latch unit rotates, it mechanically moves the door latch into the unlocked position.