Lighting Control Switch

LIGHTING CONTROL SWITCH

The lighting control switch is located in the driver's side of the instrument panel, below the outer fresh air vent. The switch contains a rotary switch for selecting the vehicle exterior lighting functions, a rheostat for manual headlamp levelling (if fitted) and an instrument illumination dimmer rheostat.

Three variants of the switch are available to cover the different vehicle specifications and market variations.

NOTE: High line lighting control switch shown





All outputs from the lighting control switch, with the exception of the dimmer control output and the headlamp levelling control output (if applicable), are subject to a voltage drop through the switch of approximately 200mV. Therefore, assuming that the input voltage to the switch is 12V, then the voltage measured at the switch output pins will be 11.8V.

Rotary Control
The rotary control can be rotated to select one of four positions; off, side lamps, headlamps and automatic (AUTO). On vehicles without the automatic feature the switch only has three positions.

Three additional positions for fog lamps are available by pulling the rotary control; all fog lamps off, front fog lamps on only and front and rear fog lamps on. On vehicles without front fog lamps the switch can only be pulled once to activate the rear fog lamps.

On vehicles fitted with front fog lamps, the rotary control can be pulled to select fog lamps when it is in the side lamps or headlamps positions.

On vehicles without front fog lamps the rotary control can only be pulled to select rear fog lamps when it is in the headlamps position.

The fog lamps will be switched off automatically when the rotary control is turned to the off position or pushed in to the fog lamps off position.

Manual Headlamp Levelling Control (if fitted)
The manual headlamp levelling control is only available on vehicles with coil spring suspension and is used to lower the headlamps when an excessive load is placed on the rear of the vehicle, altering the vehicle attitude and raising the headlamp beam.

The control uses a rotary thumbwheel which is connected to a rheostat which gives a variable output to the levelling stepper motors. The motors respond to the output and move to adjust the headlamp position as required.

The control has three marked positions; 0 to 3. The rotary wheel moves in 8, half positions to give fine adjustment control over the headlamp position. The positions relate to vehicle loading or driving conditions as follows: Position 0 is the normal position for unladen driving. Positions 1 to 4 lower the headlamp beam to compensate for a drop in height of the rear of the vehicle.
^ 0 = Driver only or driver and front seat passenger
^ 0.5 = Driver, front seat passenger and 3rd row seats occupied (7 seat models) or all seats occupied (5 seat) models
^ 1 = All seat occupied (7 seat models)
^ 1.5 = All seats occupied and maximum rear axle loading
^ 2 = Driver only and maximum rear axle loading
^ 3 and 4 = Can be used under certain driving conditions, i.e. off-road

Dimmer Control
The dimmer control provides a Pulse Width Modulated (PWM) output to control the illumination brightness of the instrument panel and other fascia illumination. The dimmer switch operates using a rotary thumbwheel which is connected to a rheostat and a high side switch.

The rheostat is a variable resistor which provides a high or low resistance according to its set position. This output is passed to a switchable capacitor or a high side switch. The high side switch uses the output from the rheostat to determine the switching frequency of the capacitor which provides the PWM output of between 8 and 12V to determine
the brightness of the illumination.

Automatic Headlamps
Refer to Automatic Headlamps in this section.