System functions: Notes

The system functions of the electrically operated seats include:

• Seat adjustment
• Rear easy-entry facility
• Seat heating

Seat adjustment 

The installed seats feature the following seat adjustment options:

• Seat forward/backward adjustment (with electric drive unit, 2 speed stages)
• Seat height adjustment (with electric drive unit)
• Seat depth adjustment (manual only, sports seat only)
• Backrest angle adjustment (with electric drive unit)
• Head restraint height adjustment (E63: manual; E64: with electric drive unit)
• Head restraint angle adjustment (manual only)
• Lumbar support height adjustment (electropneumatic)
• Lumbar support depth adjustment (electropneumatic)

  For more information, refer to E63/E64 DRIVER'S SEAT AND PASSENGER'S SEAT .

The standard seat forward/backward adjustment, seat height adjustment, seat cushion tilt adjustment and backrest angle adjustment facilities are each operated with separate electric drive units in all seats. The head restraint height adjustment is driven by an electric drive unit only on the E64.

All these functions are controlled via the control panel on the outer sides of the seat cushions. Signals from the respective button trigger seat adjustment in the required directions.

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

The limit stop is calculated for each drive unit in order to reduce the load of the electric drive units to a minimum. Automatic recognition of the limit stops is integrated in each of the electric drive units. 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 limit stop. All subsequent adjustments are interrupted just before this point.

Once the obstruction has been removed, adjustment can again extend beyond the newly detected limit stop when the seat adjustment button is pressed again.