Turn indicator-low beam switch

Brief description of components

Turn indicator-low beam switch

The steering-column lever to the left of the steering wheel switches the functions

• Turn indicator (one-touch flashing or continuous flashing left or right) with terminal R On,
  
• Parking light left or right: with terminal R OFF, overpress the switch beyond the engaging point, as for continuous flashing.
  
• High beam and headlight flasher.
  

The steering-column lever no longer engages in the switch positions. The functions are operated by

• Touching the switch to move it forwards or backwards: high beam and low beam
  
• Touching the switch to move it to the right or left: one-touch indicating
  
• Overpressing the engaging point: continuous flashing
  

If the driver operates the steering-column lever

• a message is transmitted to the light module. Signal path: From the SZL (steering column switch centre) via the data bus BYTEFLIGHT to the SIM (Safety and Information Module); from SIM via the data bus BYTEFLIGHT to the ZGM (Central Gateway Module); from the ZGM via the data bus K-CAN SYSTEM to the LM (light module).
  
• At the same time, the light module evaluates a direct signal from the steering-column lever. This signal is transmitted across a separate cable, making it independent of the K-CAN SYSTEM data bus.
  

Function limitation in the case of failure of the data buses:

• 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
  
• No hazard-warning lights in the event of a crash and when arming the anti-theft alarm.