CITROËN 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 adjustment
Raise the control and slide the seat
forwards or backwards.
Driver's or passenger's seat
height adjustment
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 back angle adjustment
Turn the control knob to adjust the seat
backrest angle.