Hello.

I just got a used 1990 Toyota Corolla GTS. Its working great , theres just one problem with the horn. It dose not work. Any ideas on what i should look for?

thanks!

Check the voltage across the horn contact to ground. If you have 12 V when you press the horn button, you have a bad horn. If you don't get any voltage when you press the horn, check for a bad fuse, then check the wiring. If you can't find anything wrong, check for a bad relay or horn button.