L322 Range Rover System Description and Operation
LIGHTING
DESCRIPTION AND OPERATION 86-2-13
Lighting Control Switch
1 Light control rotary switch
2 Off position
3 Side lamps position
4 Headlamps position
5 Instrument illumination dimmer rheostat
6 Rear fog lamp switch
7 Front fog lamp switch
The light control switch is located in the fascia between the steering column and the driver's door. The switch
comprises a three position rotary switch for controlling side lamps and headlamps, a thumbwheel rheostat which
manually controls the fascia and interior switch night illumination, and momentary push switches for front and rear fog
lamps.
The rotary side and headlamp control switch has three connections to the LCM. One connection supplies a reference
voltage to the switch contacts. The two remaining connections supply a combination of earth paths to the LCM for the
side lamp or headlamp selection contacts.
The front and rear fog lamp switches operate in a similar way, completing earth paths to the LCM when the switch is
pressed. The fog lamp switches are momentary, non-latching switches which briefly complete an earth path which is
sensed by the LCM.
