There is usually only 1 wire to the horn from the steering column, via a relay. Disconnect this wire and run a bit of wire from the positive terminal of the battery direct to where you took the wire off. The horn should sound. If it does, then you know the horn is ok and the fault is probably the relay , broken wire, blown fuse or poor connection in the horn circuit. If the horn doesn't work, then you know that the horn itself has failed.
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