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the stock horn is located behind the chrome upper grille assembly, fairly easy to get too... 4 bolts and some plastic tabs. It has a spider nut on the back side a 10mm wrench will take it off... however there IS a fuse... so you could check that first, its in the owners manual so just quickly thumb through that and scoot over to your closest auto parts store... when you pull the fuse look closely at the inside, there is a small metal filament that if broken/burnt means the fuse is the culprit...
Nothing to see here, just a bone stock H3, move along please...