Theory Of Operation

When the Body Control Module (BCM) receives a hard-wire signal from the Steering Control Module indicating horn operation is requested, the BCM provides a voltage output to the coil side of the Horn Relay through the Horn Relay Control circuit. When the Horn Relay is active, a voltage output is sent through the Fused Horn Control Output circuit to the Horn. A ground path for the Horn relay is provided through the Power Distribution Center (PDC).