Rick's Free Auto Repair Advice

Posts Tagged: horn doesn’t work

Horn doesn’t work

Horn doesn’t work — diagnose and fix Horn systems are pretty straight-forward In older vehicles the horn switch grounds the control coil of the horn relay. Once grounded, the relay switches battery power to the horn. In newer vehicles, the horn switch acts as an input to the body control module (BCM) and the BCM provides the ground to the horn relay. click on the image below to download a PDF of the two most common horn wiring diagrams. Most common cases of horn doesn’t work condition • Horn fuse … Read More

GMC Sierra Horn doesn’t work

Horn doesn’t work If the horn in your GMC truck doesn’t work, here are a few tests and some results shops are seeing. First, supply power directly to the horn, bypassing the horn switch, horn fuse, clock spring, and horn relay. If the horn honks, that confirms you’ve got an electrical problem somewhere else. Next supply power ground the tan wire for the horn relay behind the clock spring. That ground wire goes to the control coil in the horn relay. If the horn still doesn’t work, pull the horn … Read More


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