security alarm
 

I have a 91 brougham and the dash alarm light stays lite after I take keys out and lock doors with the door button. Light stays lite and after a little while the alarm goes off and I have to unlock door with key to shut off. I'm sure the alarm light that stays on will drain the battery. Wondering what is keeping the alarm light on. Any help would be very help full.

Door jam or lock cylinder tamper switches open