How do you check horn is bad?

To check if a car horn is bad, start by pressing the horn button while someone else listens closely near the horn itself. If there's no sound or a weak sound, the horn may be faulty. You can also check the horn's wiring and connections for corrosion or damage, and test the horn with a direct power source to see if it works. If it still doesn't function, it likely needs to be replaced.