Why does the door keep making a clicking sound for a long time after locking?
2 Answers
Because the central locking system is damaged, causing abnormal noise after the door is locked. In this case, the central locking system should be repaired immediately, otherwise it will affect the use of the car. When repairing the central locking system, be sure to go to a professional institution or 4S shop, and use genuine original parts during the repair. The following is the principle of the door lock sound: When switching the motor, if the motor is blocked in a specific position, an arc will form between the brush and the commutator inside the motor, causing the brush to vibrate and produce sound. This is a common phenomenon in DC brush-type motors under suppression conditions, and the motor structure cannot completely avoid it.
I've encountered this issue a few times, mainly due to problems with the motor inside the lock mechanism. Nowadays, car door locks are mostly electronically controlled. Every time you press the key fob, the small motor inside the lock mechanism drives the gears to rotate. If the gears are worn out or the motor brushes are failing, it gets stuck in a state between turning and not turning, making a clicking sound as it struggles back and forth. The most extreme case I've seen lasted half a minute before the motor burned out and stopped. If your car frequently has this problem in rainy weather, it's likely due to rusted gears or a short circuit on the circuit board caused by moisture. The most straightforward solution is to remove the door panel and check for any blackened traces on the lock mechanism connectors. While you're at it, apply some grease to any rusted latch components—sometimes it's just sticking that triggers a chain reaction of faults.
