2. Faulty door lock actuator: The door lock actuator is responsible for locking and unlocking the doors. If it fails, the door locks will stop working. Test the actuator by applying voltage to it directly and see if it moves. If it doesn't, it needs to be replaced.
3. Wiring issue: Check the wiring harness that goes to the door lock actuators. Look for any damage, corrosion, or loose connections. Repair any damaged wires and clean any corrosion.
4. Faulty door lock switch: The door lock switch is what you use to lock and unlock the doors. If it fails, the door locks will stop working. Test the switch by pressing it and see if it sends power to the door lock actuator. If it doesn't, the switch needs to be replaced.
5. Faulty control unit: The control unit (also called the body control module or central locking module) is responsible for controlling the power door locks. If it fails, the door locks will stop working. Diagnosing and repairing a faulty control unit can be complex, so it's best to take your vehicle to a professional if you suspect this is the issue.
