How do I know? Because thanks to the good advice on here, I removed it 3 years ago when it started to go off ('99 model year) and the problem disappeared.
Last night, however, the alarm went off twice (at 0430....woke up both baby and toddler!) and I have no idea why.
Does anyone have any idea what might have caused this? It was a calm night, no rain, no foxes jumping on the bonnet or anything like that.
Thanks in advance