My friend has a 13 year old Mazda 3 2011. Its alarm system goes off randomly about once in two hours. What I really want to do is to totally disable the alarm system instead of fixing it. I read that in addition to sensors on the doors, there are also ultrasonic sensors inside the car. All these components are getting old and failing.

Any links on how to do that would be greatly appreciated. Right now, I pulled out the fuse for the horn so that the alarm doesn't disturb the neighbors, which disabled the horn.