What is the reason for the abnormal noise from the motor when unlocking the car door?

[DiAngela]

The reason for the abnormal noise from the motor when unlocking the car door is a malfunctioning door lock switch. Here are the relevant details: 1. Other possible causes: Due to prolonged use, the hinge may produce noise. The car door and the body are connected by a door limiter. When the door is opened to its maximum angle, grease and dirt may accumulate on the limiter arm, limiter pin shaft, and connecting bracket surfaces. The car's sealing strip may have aged, leading to friction sounds, i.e., noise. 2. Door hinge: This is the connecting mechanism between the car door and the body. 3. Door opening limiter: Its function is to limit the extent to which the door can open. On one hand, it restricts the maximum opening angle of the door to prevent it from opening too wide. On the other hand, it can keep the door open when needed, such as when the car is parked on a slope or during windy conditions, preventing the door from closing automatically. Common door opening limiters are separate strap-type limiters, while some are integrated with the door hinge, typically providing limiting functions when the door is fully or partially open.