I can't be much help other than to say my Z3 had a Thatcham system fitted that was a total pain as it was always going off for no reason. Even if you walked passed the car it would start bleeping and making noises. There is a very good mobile auto electrician I use, he came round and removed the whole thing in 25 minutes. Now I'm back with the standard BMW system and its fine. That was the best £45 I have spent on the car !
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