hi guys , i tried doing a search but the website freezes on me

my TJ sometimes sounds the alarm (car horn ) when i go to unlock the drivers door. i dont think its an aftermarket unit , i cant find any extra modules anywhere so i assume its a factory fitment.
to silence the alarm we just turn on the ignition.

there was no remote that came with the car so we can live without it anyway.

it does not do it all the time either. i first thought it happened if i unlock the door and open it too fast but now am not so sure.

any ideas pls?
thanks