Audi SQ7 Keyless Entry System Failure Fix Guide

Having worked on my 2020 Audi Q7 with a similar central locking issue, I can share my experience. As someone with some car repair experience, particularly with security systems, I encountered almost identical symptoms. The key fob stopped communicating with the central locking system completely. After diagnostics, it turned out the wiring harness connecting the door lock controller had deteriorated, causing intermittent connection issues with the keyless entry system. The repair involved replacing a faulty connector and rewiring part of the door lock mechanism. Total cost was 95 Euro for parts and labor. The workshop completed the fix in about 2 hours. Quick question, have you noticed any other electrical issues? For example, does the interior light still activate when you open doors manually? This could help pinpoint if its isolated to the central locking system or part of a broader electrical problem. Also, to provide more specific guidance, could you share: Whether all doors are affected or just specific ones, If the physical key still works normally in the door lock, Whether your key fob battery has been recently replaced, If the security system warning appeared before or after the locking issues started This information would help determine if your issue matches what I experienced with my vehicle.

Last service completed at 82000 KM, now at 85098 KM. Thanks for the detailed response. Yes, the physical key works fine in the door lock, and the key fob battery is new. The issue affects all doors simultaneously. When checking the fuse box, all fuses related to the central locking system appear intact. The security system warning light appeared about a week after the remote locking stopped working. Interior lights function normally when manually opening doors. This makes me think the door locks themselves might not be the primary issue. Based on your experience, it does sound similar. Would be glad to hear if anyone else encountered this exact problem with their SQ7s door locks, especially with the delayed security system warning.

Thanks for providing those additional details about your SQ7. Based on what youve shared, this sounds nearly identical to what I experienced with my Q7 central locking issue. The pattern of all doors failing simultaneously, combined with working interior lights and functional manual locks, strongly suggests a central control unit problem rather than individual door lock failures. When my car had this issue, the delayed security system warning was actually a helpful diagnostic clue, it typically indicates the cars security system is detecting communication errors with the central locking mechanism. In my case, the wiring harness issue I mentioned earlier showed similar progression: 1. Remote locking failed first 2. Security system warning appeared later 3. Manual operations remained functional 4. Electrical systems unrelated to the car locks stayed normal Since youre at 85098 KM, youre actually close to when my issue occurred (around 87000 KM). The wiring harness connecting to the central locking control unit seems to be a common wear point in our models. Before your next workshop visit, I suggest having them specifically check the wiring connection between the central locking control module and the main door harness. The diagnostic trouble codes stored in your security system should help confirm if its the same issue I encountered.

Based on your repair experience and the similar timing of the fault around 85000 KM, this really sounds like the wiring harness issue you dealt with. Im relieved its likely not a complete failure of the car alarm system or door locks themselves. The progression matches exactly, first the keyless entry stopped working, then the security warning appeared a week later. All while manual operations still work fine. Knowing your repair only took 2 hours and cost 95 Euro gives me a good baseline for what to expect. Will have the workshop check those wiring connections to the central locking control module first. Your suggestion about focusing on the harness between the control unit and main door wiring makes sense given all doors are affected. The fuse box check ruled out simpler issues. Really appreciate you taking time to share such detailed info about your similar experience. This helps narrow down the likely cause and gives me more confidence heading to the workshop. Will update the forum once I get it diagnosed and repaired in case others run into the same issue with their SQ7s locking system.