How to solve the random jumping issue of the central lock on Baojun 730?
3 Answers
Generally speaking, this issue with the central lock is caused by dislodged components. Simply remove the door panel and inspect the locking mechanism for any worn, dislodged, or damaged parts. If parts are dislodged, secure them back in place; if they are damaged, replace them. If no specific fault point is observed, it is best to leave it to professionals for handling. Here is some additional information: 1. Central locking system in cars: The full name of the car central lock is Central Control Door Lock, which refers to a switch located next to the driver's seat that can simultaneously control the closing and opening of all car doors. When the driver locks the door next to them, all other doors are also locked. The driver can use the door lock switch to open all doors simultaneously or open a single door individually. When the vehicle reaches a certain speed, all doors can automatically lock. Additionally, besides the door next to the driver, other doors are equipped with separate spring lock switches, allowing independent control of a single door's opening and locking. 2. Functions: To enhance convenience and driving safety, modern cars are increasingly equipped with central locking systems. The central lock must have anti-theft functionality. When in use, the central lock also prevents doors from opening while driving, providing excellent protection for children's safety.
Last time my 730 had the same issue, spent half a day finally found the root cause. The door lock motor aging should be checked first since daily opening/closing causes heavy wear. Wiring problems are also common - wires near door hinges get repeatedly bent and prone to insulation damage/short circuits. Try replacing the remote key battery first, if still not working then check relay contact issues. The most troublesome is body control module failure - this thing acts as the brain of central locking. If damp or software glitches occur, locks will act erratically. Recommend bringing a multimeter, first remove driver door panel to test circuit continuity one by one. If DIY fails, safest is finding a mechanic to read ECU trouble codes, don't waste money randomly replacing parts like I did before.
As a frequent child-transporting 730 owner, I have a say about the erratic central locking issue. Focus on three key areas: whether the door lock mechanism is jammed (try applying some lubricant); inspect if the door wiring harness is crushed or deformed, especially the rubber sleeve on the front left door which is most prone to problems; also check the remote receiver module, as prolonged sun exposure can cause malfunctions. Once after heavy rain, I discovered the locks acting up and found standing water under the rear seat carpet, which caused the controller to short-circuit from moisture. If all else fails, keep a mechanical key handy for emergencies—it's better than being locked out.
