hey mate, not sure if this will help or not, i had an alarm installed on my car and after a couple of months it seemed to go off for no reason, (strong wind, car going past it). I checked the pin sensor thingy under the bonnet,(senses that the bonnet is down), and it the nut on the bottom had come loose and must have been moving in the breeze, tighten it up in correct position and no more alarm going off for no reason. Hope this helps.
Cheers
Brad.