On mine it was the rear door switch - inside the right rear door pillr behind the speaker there was a blade connector loose that would set the alarm off with the right breeze, noise or nudge. It would ground out and make her think the rear door had opened.
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Black '02 Discover SII, Auto. 
Black '87 Suzuki Samurai, rock crawler  :
Black '94 Discovery SI V8i, 5 spd (Currently DOA)
--## If you have enough time to do something over again, you had enough time to do it right the first time. ##--
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