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

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