Rear fog light

Brief description of components

Light switch

The light switch consists of

• Rotary switch for sidelights and low beam as well as Automatic Light Control (FCL) with light emitting diode FLC for driving light control
  
• Button for rear fog light
  
• Potentiometer for dimmer of panel illumination
  

Light module

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

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 (parking light). 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).
  

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 rear sidelights / brake light lamps left and right. The sidelights / brake light lamps 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 rear fog light, no third brake light
  
• No communication across the K-CAN SYSTEM.
  

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 lamp button is pressed again.

Country-specific version

USA

No rear fog light.