Why is my FIAT 500 horn not working?

When the horn is not working in Your FIAT 500 the first thing that You should do is check the fuse and relay to the horn. If either of these have been damaged then it will prevent it from working. The next thing to check is the wiring at the horn assembly. You will want to make sure the wires are tight and free from damage or fraying that could prevent it from working. The last thing to check is the horn assembly. You can run 12 volts directly to the horn assembly to test if it will work. If it does not work then that is a sign that You need to replace the horn with a new one.