The power door lock actuator is the part of your car door that controls the locking and unlocking of your doors. It is usually located near the top of the door, inside the door panel. The actuator consists of a small motor and a series of linkages that connect to the locking mechanism on your door. When you push the button to lock or unlock your doors, it sends a signal to the actuator which then activates the motor. The motor then moves the linkages, which in turn either locks or unlocks your doors.