Car door lock actuators are essential for the convenience and security of modern vehicles, controlling the locking and unlocking of doors via an electromechanical system. This article explains the core components of an actuator, including the electric motor, gears, linkage, and housing. It details the operational process, from signal reception to lock engagement, and outlines common issues such as motor failure, electrical problems, mechanical wear, and contamination. Troubleshooting tips include checking fuses, inspecting electrical connections, testing the motor, and examining mechanical parts. Regular maintenance, such as cleaning, lubrication, and inspections, can prolong the actuator's lifespan. Understanding these aspects helps in effectively managing actuator problems and ensuring reliable vehicle door operations.