What are the reasons why the Jetta central lock cannot lock the other three doors?
2 Answers
Jetta central lock cannot lock the other three doors, the reasons include central lock failure; the door is not closed properly, and the central lock cannot lock the door in the correct position when locking; the car lock has a problem; there may be a magnetic field nearby, which affects the signal of the central lock locking the door, causing the central lock to fail to lock the door. The main reasons for central lock failure are faults in the door lock actuator and door lock controller; the motor is aging and needs to be replaced; the fuse in the switch circuit is blown and needs to be replaced; the central lock main unit is faulty and needs to be replaced; the main motor linkage rod is loose and needs to be tightened. As a control device, the car central lock may malfunction. If this happens, it is recommended that the owner promptly go to a repair shop for inspection. The fault information can be quickly detected through a diagnostic instrument. The car central lock is a switch button located next to the driver's seat. After the driver presses it, the driver can control the door locks of the other three doors, otherwise each door can be independently controlled. There are many types of car central locks, and the basic components mainly include the door lock switch, door lock actuator, and door lock controller.
Speaking of the issue with the Jetta's central locking system not being able to lock the other three doors, I've encountered a similar situation before. It's mostly caused by circuit faults or component wear. The most common reason is a blown fuse. The Jetta's fuse box is usually located under the driver's seat—just open it up and check if the fuse for the central locking system is burnt out. If it is, replacing it with a new one will solve the problem, and it only costs a few bucks. Additionally, wiring issues are quite common, such as loose or aged door connection wires leading to signal interruption, especially in older Jetta models that have been used for a long time. There's also the possibility that the locking mechanism itself is broken, with springs rusted and stuck, requiring a complete replacement. Sometimes, the body control module (that thing called the BCM) might have a bug and needs reprogramming or replacement. I once helped a friend fix this issue. My advice is to check the fuse first—it's quick and cheap. If that doesn't work, take it to a professional shop to diagnose the circuit and lock mechanism. Avoid forcing a repair to prevent making things worse, and address it early to avoid the hassle of doors not locking at night.
