Land Rover LR3/Discovery 3 Service and Repair Manuals

 
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. 
 

High line lighting control switch shown 

Item  Part Number 

Description 

1

 -

OFF position

2

 -

Side lamps position

3

 -

Headlamps position

4

 -

Automatic headlamps position (if fitted)

5

 -

Headlamp levelling control (if fitted - only applicable to vehicles with coil spring suspension)

6

 -

Instrument illumination dimmer control

7

 -

Rotary control switch