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At work so don't have the book, I assume you've checked all the fuses in the drivers side footwell?! If they are all intact it could be a dodgy horn on the way out. I had this about a year ago. except in my case the horn kept blowing the fuse so check all the fuses of a blown one. if blown, replace and give horn a good test. if it blows again it's the horn that needs replacing.