Lincoln Nautilus: Horn / Horn - System Operation and Component Description. Description and Operation

System Operation

System Diagram- Vehicles Without Active Steering

Horn Operation - Vehicles Without Active Steering

The horn switch consists of 2 sets of contacts separated by springs. The lower set is connected to ground and the upper set is connected to the horn signal circuit. When the driver air bag module is pressed, it pushes down on the upper set of contacts, collapsing the springs and allowing the contacts to touch. When the contacts touch, it completes the circuit and provides the ground signal which is routed through the clockspring, SCCM and then to the BCM . The BCM then energizes the horn relay sending voltage to the horn, enabling the horn to sound.

System Diagram- Vehicles With Active Steering

Horn Operation - Vehicles With Active Steering

The horn switch uses 2 sets of contacts separated by springs. The lower set is connected to ground and the upper set is connected to the horn signal circuit. When the driver airbag is pressed, it pushes down on the upper set of contacts, collapsing the springs and allowing the contacts to touch. When the contacts touch, it completes the circuit and provides a ground signal through the clockspring to the BCM horn input. The BCM then grounds the horn relay coil to energize the relay. When energized, the horn relay provides voltage to the horn, enabling the horn to sound.