How can I find a fault on my Vauxhall Astra alarm system?

My Astra 1700 TD Estate (P reg) alarm has a fault and when set it goes off randomly. It can take between 5 minutes and 5 hours, but rest assured, if set it WILL go off in the middle of the night. Anyone got any knowledge on the best way to trace the fault?
Mick Rogerson, April 2005


done
I believe this will be the security alarm's own built in standby battery needing to be replaced.
Michael

Michael, August 2006
I have exactly the same problem, on exactly the same car, I will post a question also

Graham Young, August 2005
link Click here to see other fixes for Vauxhall Astra.