Why does the central locking system of the Baojun 730 frequently jump?

[SanRachel]

The frequent jumping of the central locking system in the Baojun 730 is caused by a faulty switch inside the central door lock, a malfunction in the related wiring of the central door lock, or damage or sensor failure in the left front door lock actuator. It is recommended to have it checked at a repair shop. The central locking system, fully known as the central control door lock, is an automotive accessory that allows remote opening and locking of doors without inserting a key into the lock. It consists of a door lock switch, an actuator, and a controller. The Baojun 730 is an MPV model with a body length, width, and height of 4710mm, 780mm, and 1740mm respectively, and a wheelbase of 2750mm. The Baojun 730 is equipped with two types of engines: a 1.5-liter four-cylinder naturally aspirated engine and a 1.5-liter four-cylinder turbocharged engine.

[AnnieAnn]

As a veteran driver with ten years of experience, I believe the erratic behavior of the central locking system should be checked in these areas. The main issue is unstable power supply to the lock control module; fluctuating generator output voltage can cause the central locking system to malfunction. The Baojun 730's door lock connectors are prone to water ingress, which corrodes the contact points. Oxidation of the connector pins leads to poor contact, causing the locks to jump repeatedly like a seizure. Additionally, aftermarket dashcams drawing power from the door lock circuit can interfere with signal transmission. The most common problem is the sticking of the lock relay armature inside the driver's door panel—a clicking sound indicates it's jammed. A more hidden issue is water ingress in the trunk lock's travel switch causing a short circuit, which tricks the system into thinking the trunk isn't closed. It's advisable to first disconnect any aftermarket devices for testing. If the problem persists, the door panel should be removed to clean the connectors.

[Darin]

Last time I helped my dad fix his 730, we encountered this exact issue - the central locking system dancing on its own is definitely problematic. The most common cause is worn-out carbon brushes in the door lock motor, causing weak rotation and spasmodic movement. A depleted battery in the original remote key can also mistakenly send signals triggering a locking loop. The deformed spring inside the driver's side unlock button is troublesome - if it doesn't spring back after pressing, it keeps sending wrong commands. Worn wiring insulation at door harness bends is a common fault, as short-circuited wires make the control module send random commands. Water accumulation under the passenger floor mat during rain is even worse - a soaked BCM completely messes up the entire locking logic. Using a diagnostic tool to read fault codes is the easiest solution, checking if the left front door position sensor reports errors.

[OliveFitz]

Handled five cases of erratic central locking behavior in the 730 model, with the root cause being control logic conflicts. When the door lock position switch sends contradictory signals to the body control module (such as simultaneously reporting 'unlocked' and 'not locked'), the module continuously attempts error correction, causing the lock pillar to repeatedly jump. Internal planetary gearset jamming in the door lock actuator can also lead to system misjudgment. Aftermarket anti-theft devices are particularly problematic – incorrect wiring of two signal lines can create an infinite loop. Recommended first step: disconnect the battery negative terminal for five minutes to reset the system. If unsuccessful, inspect the microswitch on the door latch mechanism, as the plastic actuator arm has an exceptionally high breakage rate.

[AdalineDella]

This issue commonly occurs in 730 models from humid regions. When the corrugated conduit of the wiring harness at the four door hinges cracks, rainwater flows along the wires into the door lock actuator, causing mold on the copper coil and resulting in partial short circuits. The oxidized limit switch in the left front door lock assembly is even more troublesome, as parasitic current on the contact plate makes the lock cylinder operate erratically. Use a multimeter to measure the actuator's resistance—normally around 7 ohms. If it reads below 3 ohms, the coil is burnt out. Loose mounting screws (all three securing the actuator inside the door panel) can also cause misalignment and sticking, producing a distinctive clicking/bouncing sound. Remember to apply grease to the lock latch during servicing.

[DelBrayden]

The dancing central locking issue often has multiple causes. When the contacts of the locking relay arc and weld due to burning, delayed power disengagement can cause jerky movements. The most annoying culprit is voltage fluctuations from loose connections in the Body Control Module (BCM) connectors, making signals hiccup intermittently. Dust intrusion in the spare tire well's gateway module disrupts CAN bus communication, scrambling door lock commands. Vehicles with aftermarket window regulators are more prone to issues—incorrect wiring can trigger signal conflicts. For diagnosis, have someone hold down the unlock button on the driver's door; if other locks immediately stabilize, it likely indicates oxidized BCM terminals.