Still, even the best-made horn can eventually wear out or break. The Car Switch website lists five common faults that can cause a horn to malfunction: the clock spring, the fuse, the horn relay, wiring, or the horn itself may be at fault. Normally, drivers activate the horn by pressing a certain spot on the steering wheel, indicated with a small trumpet. If pressing this spot fails to produce any sound, one of these issues may have caused the horn to malfunction.