Horn: Description and Operation

CIRCUIT OPERATION
The horn system is powered by a 20 Amp fuse located in cavity 8 of the junction block. The fuse is HOT at all times, on circuit F30, and supplies voltage to the coil and to the contact side of the horn relay. Circuit F30 is spliced internal to the junction block and supplies voltage to the cigar lighter and the power amplifier.

Power for the fuse is supplied on circuit A13, which originates in the Power Distribution Center (PDC), and is protected by a 20 Amp fuse located in cavity E

When the operator presses the horn switch, a ground path is completed on the coil side of the horn relay through the switch, on circuit X3. The horn relay, located in the junction block, then CLOSES the relay contacts. Voltage is passed through the CLOSED relay contacts on circuit X2 to the horns. Grounding for the horns is on the Z1 circuit to the right front frame rail.

On vehicles equipped with Vehicle Theft Security System (VTSS), the X3 circuit is spliced to the Body Control Module (BCM). Description and Operation