Horn: Description and Operation

HORNS

DESCRIPTION

General
Two horns are located behind the RH side of the front bumper. Operation of the horns is controlled by the two steering wheel mounted switches when the ignition switch is in either the 'auxiliary' or 'ignition' position.

OPERATION

Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fuse 10 and fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fuse 10 is connected to the switch contacts of the horn relay, which is also located in the passenger compartment fuse box.

Fuse 53 (C0583) is connected to the ignition switch (C0028 on V8 vehicles) by an R wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028 on V8 vehicles) to the horn relay coil (C0585) on a PB wire.

Horn Relay
The earth path for the horn relay coil (C0587) is controlled by the steering wheel modules (C2285) via the rotary coupler (C0082) on an NR wire. When either of the horn switches are pressed, an earth path is created via the rotary coupler (C0082) on an NB wire. This energises the horn relay (C0585) allowing fuse 10 of the passenger compartment fuse box to supply a battery feed to the LH (C0003) and RH (C0004) horns on a pair of PS wires. Both horns are earthed on N wires.