Other functions: Notes

The footwell module (FRM) influences various functions in the vehicle. The following components are controlled by the footwell module:

• Exterior mirrors
• Exterior lighting
• Interior lighting
• Central locking system
• Power windows

  Exterior mirrors 

  The requests to adjust the mirror are sent via the LIN bus. The footwell module (FRM) receives and processes the signals via the LIN bus. Every 20 milliseconds, the footwell module queries whether there are requests from the switch block.

  In the Sleep mode, the power supply is switched off. The outside mirrors cannot be actuated.

  The mirror heating on the outside mirrors (optional extra) is activated by the footwell module. The corresponding information is forwarded to the evaluation electronics in the mirror via the LIN bus.

  If a mirror memory is installed, the footwell module saves the memory position of the mirrors.

  Exterior lighting 

  The lighting function are integrated in the footwell module (FRM).

  These lighting function are:

  • Side lights
  • High-beam headlight
  • Headlight flasher
  • Turn indicator
  • Hazard warning flashers
  • Brake light
  • Low-beam headlights
  • Reversing light (signal for reversing light comes from electronic transmission control via bus or from reverse gear switch)
  • Fog lights
  • Rear fog light
  • Parking light

  Besides the lighting functions, other exterior lighting functions are also integrated in the footwell module:

  • Light monitoring
  • Headlight beam throw adjustment
  • Emergency operating mode if the footwell module fails
  • (important lighting functions are substituted by other lights being actuated in the event of individual lights failing.)
  • Headlight courtesy delay feature
  • Visual alarm after triggering of the anti-theft alarm system (the visual alarm is issued according to the coding by hazard warning lights, flashing with low-beam headlights or flashing with high-beam headlights.)
  • Activation of bi-xenon headlights
  • Activation of the step motor controller for the adaptive headlights
  • Turning lights The cornering light is coupled to the Adaptive Headlight.

All lighting functions except the additional brake light are supplied with a pulse-modulated signal by the footwell module (FRM). This PWM signal enables a uniform brightness of the exterior lights.