What Are the Common Faults of Car Central Locking Systems?

[MackenzieMarie]

Common faults of car central locking systems include: only one or two door lock mechanisms not functioning; all four door lock mechanisms only able to unlock or only able to lock; all four door lock mechanisms automatically locking after unlocking or automatically unlocking after locking; automatic locking while driving sometimes works normally and sometimes fails. Fault troubleshooting methods: 1. Check the remote control battery: measure the voltage of the remote control battery, which is normal; the battery contact is good. 2. Fault testing: perform remote control operation tests. When operating the remote control in front of the car, there is no response. Standing on either side of the car and operating the remote control occasionally succeeds, while operating the remote control from the rear of the car significantly increases the success rate. When close to the rear of the car, the remote control works perfectly. The remote control operation test indicates that both the remote control and the receiver are functioning normally, and the most likely fault is the receiving antenna installed at the rear of the car. 3. Check the receiving antenna: open the trunk lid, lift the padding layer, and locate the black box below the antenna, which is the anti-theft control ECU. Follow the black antenna of the anti-theft ECU and find that it has been severed by the antenna fastening screw; continue tracing the broken end and determine that this wire is the signal line of the audio antenna. The anti-theft ECU antenna shares the audio antenna to enhance the remote control signal strength. 4. Fault handling measures: reconnect the broken wire, and the remote control resumes normal operation, resolving the fault. 5. Fault analysis: after the remote control receiving antenna of the anti-theft ECU is broken, the antenna is too short, resulting in a weak signal reception, so it only works at close range.