Right im on a bit of a roll today and managed to sort loads of small bits and bobs including this problem,what i dropped my screwdriver on was the crash sensor,i tried the ignition on and off,no good,disconnected the battery no change,dismantled crash sensor checked it and replaced no change.so from then on i was at a loss until my 4 year old who was sitting on the wing watching dad trying to get himself out of some ever deepening brown stuff,leant down and pushed the bonnet alarm sensor and i had left the ignition on while i was back and forth and it stopped.so my son ben is available for all major fault finding at a very reasonable rate(usually a tube of smarties) to anyone who requires his services.To be honest its about time he helped for a change rather than wandering off with that all important bolt or spanner little [!Expletive Deleted!]!!!!