What is the reason why the 10-year-old Excelle's central lock can only lock but not unlock?
3 Answers
10-year-old Excelle's central lock can only lock but not unlock due to a damaged central control unit. Below is relevant information about the car's central control system: 1. Introduction: The car's central control is where comfort and entertainment devices such as air conditioning and audio are controlled. The car's central control includes the central control door lock system, which allows the driver to control the opening and closing of all doors and the window lifting system. The central control door lock system mainly has three functions: central control, speed control, and individual control. The driver can control all door locks, and when the vehicle reaches a certain speed, the doors automatically lock. Other doors have independent switches, allowing individual control of each door. 2. Actuator: The central lock actuator is used to execute the driver's commands to lock or unlock the doors. There are three driving methods for door lock actuators: electromagnetic, DC motor, and permanent magnet motor. Their structures all change polarity to reverse their motion direction, thereby executing the locking or unlocking action.
I just drove a 10-year-old Excelle and also encountered the issue where the central locking system could only lock but not unlock. It's probably a blown fuse or a short circuit. These are common problems in older cars because the door lock actuators may have aged or failed, especially when there's insufficient power during unlocking. It could also be poor button contact or issues with the remote control's signal reception. I suggest you first check the fuse box under the driver's seat and look for the fuse related to the central locking system to see if it's blown. If that doesn't solve the problem, it's best to take it to a repair shop to check the relay and body control module. Similar models like older Buicks often have these issues, and not fixing them in time could even affect the security of the car key usage.
My buddy's Excelle has the same issue - the central locking only locks but won't unlock. It's mostly caused by a blown fuse, especially in the circuit controlling the unlocking function. It could also be due to worn-out contacts in the door switch preventing signal transmission. Other possibilities include aging wiring with loose connections or a dead remote key fob battery. You can try replacing the fuse yourself - it's simple: turn off the power, locate the fuse box, and replace the bad fuse with a new one according to the manual. If that doesn't work, it might be a faulty relay needing replacement. The Excelle's central locking system is quite sensitive, and wiring issues tend to accumulate - don't delay repairs as it may become harder to fix later.
