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How to Fix a Car Horn. If your car horn stops working, you can troubleshoot and often repair
the problem. You will need Battery Fuse Horn button Wiring and mechanic. Step 1. Check
whether the horn makes any sound. If it does, the electrical circuitry is still working.
Most vehicles have two horns, which sound at the same time. They are usually mounted
to the radiator core support or behind the vehicle's grill. Step 2. Unbolt, clean any
corrosion, and reinstall the horn if it does not sound. If the horn still does not work,
run a jumper wire to it from the battery. If it still does not work, replace it. Step
3. Check the fuse that controls the two horns if there is no sound from either one. If the
fuse is burned out, replace it. Try the horn again. Check your car owner's manual for the
location and type of fuse. Step 4. Check whether there is any debris obstructing the horn button
on your steering wheel that may be preventing the horn from sounding. Step 5. Check -- or
have a mechanic check -- the wiring attached to the horn, if all else fails. If it is damaged,
repair or replace it. Now you can make some noise. Did you know Before 1910, bulb horns
were widely used on automobiles.