Posts Tagged: horn doesn’t work

Why your car horn doesn’t work: Troubleshooting Guide

Learn what to check when your horn doesn’t work In older vehicles, the horn switch grounds the control coil of the horn relay. Once grounded, the relay switches battery power to the horn. However, in newer vehicles, the horn switch acts as an input to the body control module (BCM), and the BCM provides the ground for the horn relay. Click on the image below to download a PDF of the two most common horn wiring diagrams. When your horn doesn’t work, check these most common causes • Horn fuse … Read More