* Power Lock Switch: This is the control you use inside the car to lock or unlock the doors. It sends an electrical signal.
* Power Lock Actuators: These are small electric motors located in each door. They receive the electrical signal from the switch and move a mechanism to lock or unlock the door latch.
* Wiring Harness: A network of wires connects the power lock switch to the actuators and possibly to other related components like the key cylinder. This harness carries the electrical signal.
* Body Control Module (BCM) (possibly): Depending on the specific trim level, the 1993 Tempo might use a BCM. This is a central computer that manages various electrical systems, including the power door locks. The BCM receives the signal from the switch and routes it to the actuators. Simpler models may not have a BCM, with the switch directly controlling the actuators.
* Power Source (Battery): The entire system runs off the car's 12-volt battery.
In short: When you press the lock switch, it sends a signal (via the wiring harness and potentially the BCM) to the actuators in each door. The actuators receive power and move the locking mechanisms to secure the doors. The unlock process works in reverse.
If your power locks aren't working, the problem could lie in any of these components: a blown fuse, faulty switch, damaged wiring, malfunctioning actuator, or a problem within the BCM (if equipped).
