Car Alarms: 2000 nissan xterra alarm wont turn off,keeps beeping, nissan xterra, alarmtek

Question
I have a Nissan Xterra 2000 the alarm will go off just like that on its own, its very annoying for the reason that it won't let me turn it on, sometimes it might work, and others i try to turn it off but it won't. is there something i can do to turn it off so i wont continue to have this problem?

Answer
Please be more descriptive if possible.

"GOING OFF?"

I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Is it: Headlights flashing, car horn honking
and a worded SECURITY" light in the dash flashing?
(doubtfull since none of the notes show this
car as having a factory alarm system)=FACTORY

Or,

is it: flashing parking lights,
an LED in the dash area, and a siren
going off?= AFTER MARKET

Let me know more on this to better
advise you on a course of action
to take.

Best Regards,

Robert Martin
CEO/ALARMTEK
CARALARMMAN.com