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Central locking system mysteriously unlocks itself

brian williams

brian williams

PCGB Member
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Just recently my 1990 C4 seems to have a mind of it's own as to whether it should be locked up or not. I did of course begin to question myself as to whether I had in fact locked it,but now I know it's not in any doubt,it DOES unlock itself! Anyone got any ideas about this one please?
 
Brian,
The Alarm SV Steuergerat is central to the electrics on the 964 including the central locking. This maybe the problem. Easiest way is to connect a unit from another car and vice versa and see what happens. The location of the unit is under the driver's seat, up against the centre tunnel, held in with two screws and there are two connector blocks that pull out. Check yours for smell of electrical burning. These are a common problem with 964s. Second hand about £70.[:)]
If nothing else you at least you can give the carpet etc a good clean whilst the seat is out.
Cheers,
 
Make sure all the doors. bonnet etc contacts are make correctly. They are notoriously unreliable and rely on an earth being made.
If they do not make 100% doors will suddenly become unlocked, or the door buttons pop up and down whilst locking, that's my experience, replacing the door switch cured this .

kevin



edited for terrible spelling
 
I'm currently having the same problem, which has coincided with the alarm failing to set properly. Car is going into JZM (who installed the alarm for the previous owner) in a couple of weeks to have it looked at - I will report back.

Jamie
 
Thanks Kevin & Jamie for the reply-I haven't got to the root of the problem yet,had a quick look under the seat for the AR Alarm Steuergerator thing and it didn't smell burnt. I may well try replacing the interior light door switches as they only seem to work intermittently too. This could be the much cheaper option to try first hopefully!!??
 
The door switches are definately cheaper, just be careful when changing them out, I disconnected the battery, mainly for my own piece of mind, but the most important thing to remember is the wiring is a sod to reclaim if you lose it behind the panel, its all pretty enclosed down there.

kevin
 
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