Ok my 97 SE-R has the factory alarm, its 11 years old.
the battery in one remote was flat, i replaced it
The on the other remote one button didn't work, the other two did.
I opened this up and the micro switch that is a SMD was broken off the board, I re-soldered it.
So first check the battery. check that the other buttons do or don't work. so manually lock the car then unlock with remote if you cant lock it. It was the lock button that didn't work on mine.
Second if the alarm goes off opening the door lock with the key should shut it off.
Are you sure it didn't arm from the remote, it doesn't beep, only flashes the side lights.
this is a Nissan alarm system right ? it says Nissan on the key fob by the loop?
Not an aftermarket controlling the factory locks.
Yes you can get a Nissan key fob easily, they sell on Ebay and the Nissan dealer.
you re-program using a series of steps, this is on the forum. If I find it I will post a link.
i think you can dis-able the factory alarm, i will have to take some time and study the wiring diagram again, i posted this some time ago for someone else, on a pathfinder i think.
2003 Pathfinder from 2004 SE 4WD
1997 SER 5sp Manual from new Rear Ended 2009 !!
Gone to the Knacker yard...
New ride 3.0 manual RWD not a Nissan !!! Gone 2016 from Hail damage.
1997 Sentra GXE from new .... Sold 2008
2001 Sunny N16 RHD from new (N16 Nissan Bluebird Sylphy) Sold