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If possible, pull the horn relay, use jumper wire on switch side of relay, right side in diagram. If the horn sounds, it's not the fuse. Sometimes these diagrams don't post, for some reason? good luck
There isn't a fuse. Just a relay. Either the relay is dead ( not likely) the horn is dead ( most likely cause) Or the steering electrics is bad. ( most likely on this is the plastic piece inside the steering wheel has broke)
Are you sure the horns are ok? They are a pain to get at, but you should try a + jumper from your battery to a horn to make sure as they do tend to plug up with road crap. While you have the connector off a horn, you should also check the voltage with someone pushing the horn button. If both checks are successful, replace the horn relay.
Generally the steering wheel boss switch does not wear out (the horn is not over used!). I would check the fuses and then the relay and if they look OK check the wiring form the relay to the horns for continuity. Use a voltmeter to check that voltage is being supplied to the relay when the horn switch is pressed. Then check that voltage is being output by the relay in response to this voltage input. If this all looks OK then there is some kind of break in the wiring to the horn unit
well polly you know where the fuse panel is so go there put the horn fuse back in and pull out the horn relay. get another relay and put it in, if the horn is better you fixed it. if the horn is not better you need a new horn switch. GM horn switches tend to fail like this, yes yours is a GM. In the olden days you replaced the horn switch yourself by snapping out the center of the steering wheel or backing out a few screws on the back of it. however these days there is an airbag in the center and you take your life in your hands in any attempt to work on it. so i would do a search on youtube and see if there is a video of someone doing this, if you think you can take it on go ahead, otherwise a visit to a dealer is in order.
Try using a 12volt jumper wire directly to the horn from the car battery. also check the ground on the horn. The last thing I would do is pull the steering wheel cover. Make sure the horn is blowing first.
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