I bought a 2002 Blazer used off a private seller. The issue I am having with the Alarm system is while the truck is parked the alarm will, for no reason at all, go off. I had to disconnect the horns since my neighbor complained (after his wife complained) about it going off at night. I've read all kinds of stuff about 'if you lock the doors the alarm will arm' so I have not locked my doors and the other night I noticed the head lights flashing as if the alarm was going off again. So, I went out and locked the doors hoping, maybe, this would prevent this issue but later that night the head lights were flashing again. Does anyone have any idea's on how to fix this issue or at the very least disarm the alarm all together? Any help would be greatly appreciated.

Thank you.