My 1996 Pathfinder used to do that and I ended up having to buy a key fob and program it to the car which was real simple to do. Before the only thing that would shut it up was disconnecting the battery and waiting ten minutes for the stupid alarm system to reset. That key in the drivers door thing doesn't work on a 96 LE because I've tried it a hundred times. I did get the lock and unlock the back glass trick to work once, but only once. I have a post on here somewhere from where I was having issues with mine. I originally wanted to disconnect the alarm system but from 1996 (just my darn luck) the alarm system is integrated into the wiring and cannot be removed.
Alarm won’t shut up!
in 96-2004 R50 Pathfinders
Posted
The back glass trick definitely worked. Thanks