CITROEN DS4 Owner's Handbook Manual page 90

Front seats
Seat consisting of a seat cushion, a seat back and a head restraint which can all be adjusted to
adapt your position for ease of driving and comfort.
Manual adjustments
Forwards-backwards
 Raise the control and slide the seat
forwards or backwards.
Driver's or passenger's seat
height
 Pull the control upwards to raise or push
it downwards to lower, as many times as
necessary, to obtain the position required.
As a safety measure, seat adjustments
should only be done when stationary.
Seat backrest angle
 Turn the control knob to adjust the seat
backrest angle.