Fog light, rear fog light

The rear fog light is standard equipment. Fog light (fog lamps) are special equipment in the case of EC version.

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
  

Light module

The light module controls and monitors the vehicle lights. Information is received and sent via the data bus K-CAN SYSTEM.

In the case of the special equipment xenon headlights, the defects of the xenon headlights are evaluated in the light module.

Emergency operation properties of the light module: The light module is supplied with terminal 30 twice.

If a terminal 30 fails, the following are activated:

• Front lighting: low beam and parking light (each on one side).
  
• Rear lighting: On one side, the outer sidelights/brake lights are activated. On the other side, the inner taillights are activated. The vehicle thus still has lights on both sides. Confusion with a one-track vehicle (motorcycle) is excluded.
  
• Brake light: One side of the brake lights is activated with normal power (ECE coding). This leads to ”one-track” braking, as if for example one brake light had failed.
  

In the case of a failure of the processor, emergency operating mode is activated. Emergency operating mode involves hardware that is completely independent of the light module. Emergency operation properties with failure of the processor:

• Vehicle lighting: At terminal 15 On, the following are switched on: Front low beam and outer rear sidelights / brake lights left and right. The outer parking light / brake lights left and right are not, as would be normal, dimmed to 10% of their brightness, but operated with full power. This ensures the function of the vehicle lighting irrespective of the position of the light switch.
  
• Brake light: With terminal 15 On, the left and right brake lights are switched on when the brake-light switch is operated (via a hard-wired, direct line from the brake-light switch to the lamp drivers).
  

Function defects with failure of the processor:

• No turn indicators and hazard warning lights, no high beam, no headlight flasher, no fog lights, no rear fog light, no third brake light
  
• No communication across the K-CAN SYSTEM.
  
• No communication with the trailer module
  

Fog lamps

The fog lights are switched on when with

• Terminal 15 ON and
  
• light switch in position sidelights or low beam
  
• the fog light button is pressed.
  

The fog lights are switched off when

• the fog light button is pressed again.
  
• or the light switch is no longer in the position sidelights or low beam,
  
• or terminal 15 OFF.
  

Rear fog light

The rear fog light is switched on when with

• Terminal 15 ON and
  
• light switch in position low beam
  
• the rear fog light button is pressed.
  

The rear fog light is switched off when

• the rear fog light button is pressed again.
  
• or the fog lights are switched off and also the light switch is no longer in the position low beam or parking light;
  
• or terminal 15 OFF.
  

Country-specific version

USA

No rear fog light.