Relay, Horn: Operation

The horn relay within the Power Distribution Center (PDC) switches battery current to the horn when the horn switch contacts close and provide a path to ground for the electromagnetic coil of the relay. When the electromagnetic relay coil is energized, it draws and holds the normally open movable contact of the relay against the fixed relay contact. The closed relay contacts supply fused battery current from a fuse in the PDC to energize the horn.

When the horn switch contacts open and de-energize the electromagnetic relay coil, spring pressure returns the movable contact to the normally open position, which de-energizes the horn. The resistor within the relay is connected in parallel with the electromagnetic coil, and helps to dissipate voltage spikes that are produced when the coil is de-energized.

The hardwired inputs and outputs of the horn relay in the PDC may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.