Light switch

Brief description of components

Light switch

The light switch consists of

• Rotary switch for sidelights and low beam (and special equipment Automatic Light Control)
  
• Two buttons for fog lights and rear fog light
  
• Potentiometer for dimmer of panel illumination
  
• Potentiometer for manual headlight vertical aim control in the case of halogen headlights
  

The rotary switch for sidelights and low beam has two switch contacts. Depending on the status of the two switch contacts, the light module can detect four switch positions:

S_SL = interior switch for sidelights

S_AL = interior switch for low beam

1 = interior switch closed (after 5 V)

0 = interior switch open

Depending on the vehicle equipment and country variant, different light switches are fitted:

• Switch for vehicles with xenon headlights and automatic beam vertical aim adjustment (LWR),
  
• Switch for vehicles with halogen headlights and manual beam vertical aim adjustment (LWR), This switch has a potentiometer for manual headlight vertical aim control (can be operated using a knurled adjuster).
  
• Switch for vehicles with Automatic Light Control. The rotary switch has an additional switch position FLC for the Automatic Light Control as well as a light emitting diode.
  

Power supply: The switch is supplied with 5 Volts by the light module.

If the power supply is defective, the light remains ON:the light is automatically switched on if

• the cables to and from the light switch have been cut or
  
• are switched to earth
  
• are at 12 V.
  
• For safety reasons, the light switch can only be switched OFF if there is 5 V at both switch outputs to the light module. If a short circuit means that there is once 5 V and once 12 V, the light can not be switched OFF: low beam and Automatic Light Control remain ON.
  

• High beam and headlight flasher only run if the steering-column lever is held.
  
• The indicator light only runs if the steering-column lever is held. no continuous flashing, no automatic reset