System Functions: Notes

In the basic variant  , the two interior lights draws their power supply from the roof control panel:

• Interior light, front
• Rear interior light

These two lights are activated via the footwell module.

In the high variant  , the FZD control unit controls the following functions:

• Reading lamp
• Interior lighting and top-light:

  Data transmission only from the buttons to the footwell module and from the footwell module to the lights (see below)

• Sliding/tilting sunroof (except for panorama glass sunroof E91)
• Master for the rain-light sensor
• Self-diagnosis
• The FZD control unit is the gateway (i.e. the data interface) for the following components and functions:
  • Gateway between K-CAN and LIN bus
  • Gateway for condensation sensor
  • Gateway for Check Control
  • Gateway for the electrochromic interior mirror and for the electrochromic exterior mirrors

The roof control panel can therefore be considered to have 3 functions:

1. The roof control panel is an installation location  for other components.
2. The FZD control unit controls  some functions.
3. For a number of other functions, the FZD control unit acts as a gateway  .

All of the above system functions are described in detail below.

1. The roof control panel is simply the installation location for the following components: