There will only be one fuse for the horn. Find and check the horn relay. If that works check the wiring and the horn switch..
If you can get to the horn run a jumper wire from the battery positive directly to the horn terminal,if the horn doesn`t work then the horn needs replacing.if the horn works then it could be the horn relay or power not being sent from the horn pad to the relay or only half the relay is working(the side that goes to the horn).did you check the fuse panel under the dash on the drivers side.
SOURCE: 2005 sierra horns stopped working.
The click you hear is the horn relay -- this likely has either dirty / corroded connections or burned contacts inside the relay. If cleaning all relevant connections doesn't solve the problem, replace the relay. You can find the realy by having someone push the horn button while you track down the click.
Charlie
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