Every time I open my door my panic alarm goes off and I can't get it to stop until I pull my horn fuse and my headlight fuse

double posted. wow.
when it beeped, did you look in the display (RPM)
it tells you why?? the VFD or EVIC tells you why.? (rpm dial)
do you park with the alarm on , on the street or a garage?????
if in a garage park and turn alarm off. it does turn off the alarm.
did you bump the panic button?
eg its under your pillow?? LOL or the cat chewed it?
read your other post, it's got lots of answer there.
to find cause.
if the horns stays off, if alarm is off then its not the horn button.

as many will say. there are 4 things that run the horn.
button horn
alarm
door locks.
panic.(part of alarm but not totally)
on my car, i have most themn turned off, like the lamp flashings.
and the horn chirp is off on all my cars, all i get is the door lock click sounds, nice (neighbor friendly)
so turn all all that and see if the horn still fails.

that panic button can fail,
if mind did id pull the fob battery and then use FOB 2.
to see of the FOB fails.

your other post said driving
this one says, parked. 3am clue.

Replace the door ajar switch.

On some models you can disable the alarm after you connect the battery by locking and unlocking the driver door with the key.
I would disconnect the horn or pull the relay until you can get the alarm turned off.

If you can try resetting your remote, and change the batteries if you can't reset it ask a dealership how to

What your hearing is the factory alarm not the horn. Connect the battery when the alarm sounds go to the drivers door lock with the key and lock and unlock the door until the alarm goes off . Then reinstall the fuse for the horn.,

hold both the lock and unlock buttons on the key fob for about 5 seconds. (this will toggle that setting on and off)

You have to roll up all the windows lock all the doors and use your key to unlock on of the front doors or the trunk when the alarm is going off. I don't remember which it was. Remember all doors must be closed and locked with the windows up for this to work.

LOL... MINE DID THAT ALSO ONE TIME THEN WE FIGURED OUT IF U REMOVE THE FUSE IT WONT START AND IF IT DOES IT WILL ONLY ALLOW U TO GO 20 MILES THEN IT SHUTS OFF!!! ITS A SECURITY FEATURE!!! SO IF IT EVER GOT STOLEN THE THEIF COULD ONLY GO 20 MILES UP THE ROAD!! I WOULD PUT THE FUSE BACK IN AND GO TO THE LOCAL NISSAN DEALERSHIP AND GET A NEW REMOTE!

I had a friend who had a similar problem on a Pontiac and he found out that he had an aftermarket alarm system put on and either when he locked the doors with the key and opened them with the remote or vice versa, it would do that. What is probably wrong is you have two alarms interfering with each other....

SYSTEM OPERATION

System warning lamp located on top of the instrument panel
Press UNLOCK button once , turns on interior lamps and deactivates alarm (if fitted)
Press UNLOCK button twice w/in 5 seconds unlocks all doors, turns on interior lamp and deactivates alarm (if fitted)
To activate alarm system (if fitted):
Switch ignition OFF
Open driver's door
Press Lock button on remote
Close Driver door
warning lamp will flash when system is activated
Press remote power sliding door button will open sliding door (if fitted) only if unlocked first
Pressing remote panic button:
*Sounds horn intermittently
*Flashes exterior lamps
*Turns on interior lamps
**Pressing panic for the second time OR switching ignition ON deactivates alarm.


PROGRAMMING
Remobe key from ignition switch
Remove the "BCM PRGRM" fuse, from the fuse box
Close all doors
Turn ignition switch to the ACC position
With in 1 SECOND , turn the ignition switch to OFF then back to 'ACC'
(really, with in one second)
Open and close the driver's door. A chime will sound, indicating programming mode activated
Press and HOLD LOCK and UNLOCK SIMULTANEOUSLY untill a chime sounds 2 times ( about 15 seconds)
Repeat this exact procedure for all remotes to be programmed
Remove key from ignition
Refit 'BCM PRGRM' fuse.

4 REMOTES MAXIMUM CAN BE PROGRAMMED