What Causes the Random Jumping of the Central Lock on the Baojun 730 Door?
4 Answers
The random jumping of the central lock may be due to a damaged lock block, causing the motor to keep working. It could also be a malfunction of the sensor that detects whether the door is tightly closed, leading to confusion in the control computer information and causing the motor to keep working. Here is a detailed introduction about the Baojun 730: 1. Overview: The Baojun 730 is a 7-seat family car customized by SAIC-GM-Wuling for the needs of millions of users, tailored for the "Chinese big family." On March 1, 2019, the 2019 Baojun 730 CVT version was officially launched, including two models: the 1.5T CVT Fashion and the 1.5T CVT Flagship. 2. Features: The Baojun 730 has practical space, high safety, comfort, and rich configuration. The 2019 Baojun 730 CVT version is equipped with a power combination of "1.5T turbocharged engine + simulated 8-speed CVT continuously variable transmission." The engine has a rated power of 111kW and a maximum net torque of 250Nm.
My Baojun 730's central door lock keeps acting up randomly, which is quite a common issue. I think it's mainly related to mechanical problems with the door lock mechanism. The springs or linkages inside the lock can wear out or get stuck over time, causing erratic movements when the door vibrates during closing. Additionally, oxidation on the door switch contacts leads to poor connectivity, sending false signals to the Body Control Module (BCM), which then issues random lock/unlock commands. Regularly check the door seals to prevent water ingress and corrosion, especially after rain—my friend's car had similar issues due to high humidity. Also, the wiring near the door hinges often gets bent repeatedly, and internal breaks over time can trigger a chain reaction. Getting it replaced at a 4S shop costs around 200 yuan, and applying lubricant regularly can slow down aging and prevent accidental locking/unlocking while driving.
The erratic behavior of the central locking system is mostly caused by electrical issues, such as blown fuses or short circuits. The wires near the door hinges often get worn out by the door's movement, and if exposed, they can short-circuit to the body, causing abnormal signal transmission. Another major cause is the sticking of relay contacts—normally, it should switch the current on and off, but a malfunction can lead to continuous power supply or interruption, causing chaos. I've encountered this several times; sometimes, just a small burnt contact point requires replacing the component. Voltage instability should not be overlooked either, as a weak battery or unstable alternator output can cause the BCM to send incorrect commands. If you're hands-on, try using a multimeter to check the circuit continuity, but avoid randomly splicing wires, as reversing them can make things worse. Simply replacing the fuse might solve the problem. For prevention, avoid leaving the vehicle parked for long periods; regularly starting it up helps keep the electrical system functioning reliably.
I believe the root cause of the erratic behavior may lie in the control module. The BCM (Body Control Module), which is responsible for the central locking system, can send faulty commands due to software glitches or hardware damage, causing the locks to cycle repeatedly. Interference with remote key fob signals is also not uncommon, such as from nearby strong electromagnetic sources that can cause malfunctions or unintended operations. Sensor failures, like a damaged door switch sending false demand signals, can lead the system to misjudge the door status. Using an OBD diagnostic tool to read fault codes can help pinpoint the issue, and sometimes updating the system firmware can fix minor bugs. This fault should be addressed promptly, otherwise, it may lead to more troublesome issues like window regulator problems.
