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How to Check Relay Fuse Box GMC Acadia Buick Enclave 2009-2017 fix repair Broken Horn not working. This is on a traverse, but believe it's the same for GMC Acadia and the Buick Enclave 2009-2017. The fuse/relay premise works on virtually all makes and models. Possibly fix your horn with out having to pay the shop fees. Simple test may save you are few hundred bucks.