Comfort Seats (standard on E38 750iL, other models if equipped)
This  option  provides  additional  back  support  in  the
shoulder  area.  An  additional  adjustment  in  the  upper
backrest  allows  forward  “contour”  that  is  controlled  by
a rocker switch in the side panel.
When the ignition is on or off, the two way rocker switch
can be pushed until the desired setting is achieved (for-
ward/backward tilt). The motor drive operates the same
as the seat motors.
The  shoulder  support  adjustment  is  also  stored  in
memory for recall.    
Active Seat (E38 - if equipped)
Purpose of the System
Actively changing the surface of the seat helps to prevent muscle tension and fatigue par-
ticularly  on  long  trips  or  sitting  in  one  position  for  a  long  period  of  time.  The  seat  causes
weight  transfers  which  are  slight  and  imperceptible  enhancing  driving  comfort.  The  basic
seating position is not changed by this.
In the seat’s upholstery beneath the surface of the seat is a cushion of fluid on the left and
right. The fluid is slowly circulated back and forth between the cushions by a pump. 
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Central Body Electronics ZKE III