The horns you hear from the alarm are not the car horns. Lay on your back beneath the lf of the car and look up, the car horns are there somewhere. I pulled a mk4 apart a couple years ago to strip it for parts and I don't quite remember exactly.
But the alarm I believe is the one under the cowl. You have to remove the wiper arms, the plastic cover beneath them, and access the area where the ecu is. From the passenger side you have the cabin filter, Ecu and trans controller, if you have an auto, and then the alarm horn. It has a wire you can unplug if I remember right, I don't know if you would have adverse effects, I would suspect not.
However, the consequences are yours and yours alone because I am many miles from you and only an irresponsible figment of your imagination.
