Repair horn on 2009 honda civic

You can check the horn first by running your own wire from battery to horn.

With the key on but not the engine, press the horn ring a listen for a click, that click is a horn relay. You may need someone to listed under the hood for you, If you don't hear the click, take the covers off the fuse box and see if there is a diagram for the relays that shows a horn relay. While you are checking, look for a fuse for the horn. In rare cases it could be the horn ring or the clock spring.