Defender 1999 MY vehicles are fitted with one or two horns (dependent on market configuration), one mounted behind each headlamp. The horn(s) are operated by depressing the end of the direction indicator switch, and are not dependent on ignition switch position.
Operation
Feed from the battery positive terminal is connected to fusible link 1 and fuse 3 of the engine compartment fuse box (C0632-1) by a brown wire. Fusible link 1 and fuse 3 are connected in series.
Fuse 3 (C0570-2) supplies a constant battery feed to the horn switch (C0036-7) on a brown/purple wire. If the switch is depressed the switch closes, allowing current to flow across the switch (C0036-8) to header 285 (C0285-7) on a purple/black wire. The RH (C0004-2) and LH (C0003-2) horns are wired in parallel, and connected to header 285 (C0285-10 & C285-9 respectively) by purple/black wires.
Both horns are earthed on black wires.