When the horn stops working, most technicians will immediately grab their test light, or voltmeter, and see where voltage is not present in the circuit. The technician should check the fuse, identify that the horn switch in the steering wheel is sending power through the circuit, and ensure the horn is receiving power. If the technician gets to the horn, and finds proper voltage at the horn when the horn switch is pressed, the horn will be inspected. If the horn is receiving power, and the connection is not corroded or dirty, then the horn will be replaced. If needed, the connection can be cleaned, and retested.

In most cases replacing a horn will involve unbolting the horn, and disconnecting an electrical connector. However, there are many situations where the horn is installed in an obstructed location, and body panels may need to be removed to gain access.

Some aftermarket horns may not be legal in your area. Check with local codes before purchasing a horn with unusual sound or volume.

Horns on most vehicles are small and can be placed in inconspicuous and hard to reach locations.

Diagnosing and replacing the horn could be a fun morning project for any DIYer. This job does not typically require many tools, and the only knowledge needed is understanding how to test a basic circuit. If the process seems totally unclear, trusting a technician with the repair is always an effective option.