try unlocking it from the hatch and see if that shuts the factory alarm off. might have broken wires in the door jamb wiring inside the rubber bellows. mine has had issues for a bit and in the last 2 weeks its had the alarm go off 3 times for no apparent reason. found multiple broken wires in the bellows...
1993 Jeep ZJ Laredo 4.0L/42RE 242 4x4. 3" springs. fixed tubular lowers. RE double-sheer front track bar. JKS adjustable rear track bar. Bilstein 5100s. 31" Falken Rocky Mountain A/T. 15" Eagle wheels. V8 steering linkage.