There was a TSB for '93 Vigors that dealt with this. Apparently the alarm would go off when you went to unlock the door. I can't remember what the fix was, but I think the issue was with the lock.
2006 Carbon Grey Acura RL
Burlwood shift knob, Hardwired Passport 9500i, Tints 35% sides and 15% rear
2004 Natural White Toyota Land Cruiser
Navigation w/voice recognition & backup camera, 6-disc CD/DVD Changer, 18" Wheels, Rear Seat DVD Entertainment, Roof Rack, Running Boards, Front & side airbags, Rollover side curtain airbags, Factory towing package, Hardwired Passport 8500, Kenwood KCAR70FM Sirius Satellite Radio