Power Door Lock Switch: Description and Operation
The Door Switch Lock FunctionWhen a door lock switch is moved into the lock position or a door lock cylinder is rotated to the lock position, the door lock switch grounds the lock circuit input to the Central Security Module (CSM). The CSM then provides 12 Volts to one side of the door lock actuators contained in the door latch unit and simultaneously grounds the other side of the door lock actuators. This completes the door lock actuator circuit, causing the door lock actuators to rotate a cam assembly, which then locks the doors. The 12 Volts that the CSM provides to the door lock actuators are provided to both door lock actuators from a single pin on the CSM connector.
The Door Switch Unlock Function
When a door lock switch is moved into the unlock position, the door lock switch grounds the unlock circuit input to the CSM. The CSM then provides 12 Volts to the opposite side (relative to locking the door) of the door lock actuator(s) contained in the door latch unit and simultaneously grounds the other side of the door lock actuator(s). This completes the door lock actuator circuit, causing the door lock actuator(s) to rotate a cam assembly in the opposite direction, which the unlocks the door(s). The 12 Volts which the CSM provides to the door lock actuator(s) are provided to each door lock actuator from the individual pins on the CSM connector.