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if the fuse and relay is fine then check the horn itself. with someone pushing on the horn button check for power at the wire on the horn you should have power if not it could be a broken wire from the horn back to the relay. also check to make sure the horn has a good ground. if you do have power chances are the horn itself needs replacing. sometimes the horn pad goes bad, but that rarely happens.
This is a tough one, if a horn itself was shorted, it wouldn't sound.Try unhooking both horns, and try to activate it from the steering wheel. If the brake light´s fuse still burns, at least you know that there is a short in the cabling leading to the horns. If the fuse doesn't trip, then one of the horns should be the culprit.