Need diagram for the fuse box
There should be only 1 fuse for the horn, if it works but not from the steering wheel it very possible and likely the horn switch in the steer wheel has malfunctioned. you could run another horn switch or replace that one but if the horn relay works and the horn sounds off then its the switch. good luck
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SOURCE: horn keeps blowing
there should be a relay box under the hood you will see the horn relay pull this out
SOURCE: volvo S60 2005 horns not working
Remove the wire connector from each horn and attach a voltmeter or test light. Have a helper push the horn button while you check for voltage. If there's no power getting to the horns you have to work your way back to the relay checking for shorts. If there is power try holding the horns metal mount against a good ground like an engine bolt or the sub frame. And with wire reconnected have your helper try the horn again. If it sounds then clean rust away from mounting bolt and car (rad support or grill bracket), and look for a loose or broken ground strap to the rad support (from either the battery or engine). If both horns still don't work either they're clogged with snow or dirt (bring them inside to defrost or clean out), or they need to be replaced.
SOURCE: help need fuse box diagram 04 dodge durango
It seems that because the diagram for the fuse codes aren't located in the owners manual, it would be a dealer item only. One possible solution is to buy an assortment of fuses.. maybe (15) switch them out 1 by one.
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