Active Seat Back Width Adjustment: Introduction: Notes

During cornering, lateral forces are exerted on the occupants in the upper body region.

The active seat back width adjustment counters these forces: The backrest side section on the outside moves inwards slightly. This provides the occupants with support in the upper body region. Active seat back width adjustment is available for the driver's seat and the front passenger seat (option 4MF).

In contrast to the seat back width adjustment which has been familiar until now, the seat back width is now adjusted actively. 

2 control units control the active seat back width adjustment:

• Active seat back width, driver's seat (ALBFA)
• Active seat back width, front-passenger seat (ALBBF)