mirror controls Citroen DS4 DAG 2010.5 1.G Owner's Manual

Storing driving positions
System which registers the electrical settings of the driver's seat and door mirrors. It enables you to store and recall two positions using the buttons on the side of the driver's seat.
Storing a position
Using buttons M/1/2
 Switch on the ignition.  Adjust your seat and the door mirrors.  Press button M , then press button 1 or 2within four seconds. An audible signal indicates that the position has been stored.
Recalling a stored position
Ignition on or engine running
 Press button 1 or 2 to recall the corresponding position. An audible signal indicates the end of the adjustment.
Storing a new position cancels the previous position.
You can interrupt the current movement by pressing button M , 1 or 2 or by using one of the seat controls. A stored position cannot be recalled
while driving. Recalling stored positions is deactivated 45 seconds after switching off the ignition.