BMW Z4 Roadster Owner's Handbook Manual page 106

CONTROLS
Forward/back
Press the switch forwards or backwards.
Height
Press the switch up or down.
Seat angle
Tilt the switch up or down.
106
Seats, mirrors and steering wheel
Backrest angle
Tilt the switch forwards or backwards.
Thigh support
Pull the lever on the front of the seat and adjust
the thigh support forwards or backwards.
Lumbar support
Principle
The curvature of the backrest can be changed in
such a way that the lumbar region, the lordosis, is
supported. The upper edge of the pelvis and the
spinal column are supported to encourage an
upright posture.
Adjusting
Online Edition for Part no. xxx - X/18
▷ Press the button at the front/
rear:
The curvature is increased/
decreased.
▷ Press the button at the top/
bottom: