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My alarm is going off on 1996 Mercury Sable

for some reason my car alarm goes off for No Reason. When I go to work, I lock the car (useing 1 chick only) I think that just locks doors, 2 horn honks setting alarm, and in about 15 min to an hour, my horn will just go off till I shut it off. I disconnected the battery for a few min to see if it might "Reset", but didnt work. It's driveing Me and my boss Crazzzzy

Asked by for the 1996 Mercury Sable
Factory alarm or aftermarket?
It's factory Im sure. I just looked at my pocket manual.
Does it do this at other places when you arm the system say at home? Maybe someone messing with you @ work!! Try it to see. Do you really need an alarm? Just dont arm the thing, problem solved!
it is the only place lately that I "Lock" my car. Nobody is messing with it foresure. I do park by highway but my manual said that alarm will only go off if doors or trunk are opened. not set on sound.
No I dont need alarm here, but might need at times
2 more answers , 1 more comment
Factory alarm or aftermarket?
It's factory Im sure. I just looked at my pocket manual.
Does it do this at other places when you arm the system say at home? Maybe someone messing with you @ work!! Try it to see. Do you really need an alarm? Just dont arm the thing, problem solved!
it is the only place lately that I "Lock" my car. Nobody is messing with it foresure. I do park by highway but my manual said that alarm will only go off if doors or trunk are opened. not set on sound.
No I dont need alarm here, but might need at times
if aftermarket alarm disconnect and see if issues goes away. they have high failure rate
I agree,, more nuisance than good anyway, especially when they fail to the point of no start!