Horn relay

The horn relay operates through a direct wire input to the IPM from the horn switch or a PCI Bus message from the BCM. The relay responds to the horn switch, remote door lock and VTSS alarm functions. The horn relay is powered through low side control internal to the IPM. Under normal operating conditions, if the horn is pressed for longer than 30 seconds, the IPM will automatically deactivate the horn to prevent damage to it. The IPM will re-activate control of the relay after a 25 second cool-down period. This circuit is electronically controlled and continuously monitors the coil side of the relay for malfunctions.