I had a Ford Pickup parked under a huge Oak tree that took a lightning strike and it caused a surge to the boards in the stereo and alarm module. Every time the cabin pressure would fluctuate in the truck (mid day heating or late night cooling), the auto-start would engage and crank up the "magic truck". While it was great entertainment for my 5 year old, I Couldn't ever sleep well because i kept waking up thinking someone was stealing my truck! Finally, one day it engaged the starter while i was doing 85 down I-4 by Disney, So i pulled over, popped off the positive battery cable and ripped the whole alarm module out from under the dashboard and tossed it into the foliage. Surprisingly, The only wrong all along was that it just needed a "bushing", because never did it again.