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How to Repair Central Locking

Model: (Various brands) Various
Part: Key

Video tutorial

The video shows the diagnosis and repair of a fault in the central locking system, using both a homemade tester and a professional tester. The one indicated by the YouTuber is no longer available, but we can suggest its direct descendant, which you can purchase on AliExpress with the code 1005006381290085 for £26.49 with free delivery.

Very often, the problem is simply a blown fuse. Use the tester to check that the fuse is intact; if it is, then that is not the issue.

Using the tester, which helps trace the wire paths, you discover where the wire from the fuse goes. Eventually, you find a point where the wire is wrapped in insulating tape, and you expect to find a control unit or box; however, on this vehicle, the central locking is controlled directly by the alarm system.

Check the alarm fuses: the first one is fine, but the second is blown; after replacing it, the locking system starts working again. The practical advice is to check the fuses before starting to dismantle anything.

If you do not find a dedicated control unit, it is wise to check if the locking is managed directly by the alarm, as in this case.


Posted on 25 April 2026 by ScegliAuto


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Watch the video!


by ScegliAuto

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