System Functions: Notes

The system functions of the electrically operated seats include:

• Seat adjustment
• Seat heating

  Seat adjustment 

  The seats fitted offer the following seat-adjustment options:

  • Fore-and-aft adjustment (manual or electrically driven)
  • Seat height adjustment (manual or electrically driven)
  • Seat depth adjustment (manual only, sports seat only)
  • Backrest angle adjustment (manual or electrically driven)
  • Seat back width adjustment (electropneumatic using air cushions, sports seat only)
  • Head restraint height adjustment (manual only)
  • Head restraint angle adjustment (manual only)
  • Adjustment of upper lumbar support (electropneumatic using lumbar cushion)
  • Adjustment of lower lumbar support (electropneumatic using lumbar cushion)

  All these functions are actuated by the buttons on the outside of the seat cushion. Signals from the respective button trigger seat adjustment in the required directions.

  Each drive unit is switched off when a certain threshold has been reached in order to reduce the load on the electric drive units to a minimum.

With the special equipment "Electric seat adjustment for driver's seat and front passenger's seat with memory for driver's seat" the end stop is calculated for each drive unit. Hall sensors integrated in the drive units register the adjustment distances which are processed in the seat module. In the event of the drive unit blocking, the detected position value is interpreted as the end stop. All subsequent adjustments are interrupted just before this point.

Once the obstruction has been removed, adjustment can again extend beyond the newly detected end stop For this to happen, the seat adjustment button must be pressed again.

If the "Seat memory" option is not installed, there will be neither a seat module nor Hall sensors fitted. End stops are not stored with this equipment variant. The seat is adjusted until it reaches an end position. The junction box electronics (JBE) recognizes the increased power draw of the respective drive unit at the end position. If the power draw exceeds a defined limit value, the JBE will switch this drive unit off.

A separate rocker switch is used to operate the lumbar support. An electric lumbar support pump supplies the lumbar cushions with compressed air. The individual air chambers are filled or emptied via several valves in order to vary the height and thickness of the lumbar support.

The seat back width adjustment is controlled by an additional rocker switch in the same way as lumbar support. An electric lumbar support pump supplies the air cushions with compressed air. The individual air chambers are filled or emptied via several valves

In this way the seat back width can be adjusted.