But an inoperative car horn can also be caused by a bad horn switch in your steering wheel, a broken “clock spring” under the steering wheel, a bum horn relay, a broken wire or a corroded ground. Here’s how to check the most likely suspects.
Connect the opposite end to the positive battery terminal. Clip one end of a second test lead to the negative battery terminal. Touch the end of the second lead to the ground pin inside the horns connector. If your cars horn doesn’t sound, replace the horn.