CITROEN DS4 Owner's Handbook Manual page 98

Automatic tilting in reverse gear
System which provides a view of the ground
during parking manoeuvres in reverse gear.
Programming
 With the engine running, engage reverse
gear.
 Select and adjust the left-hand and right-
hand mirrors in succession.
The adjustment is stored immediately.
Switching on
 With the engine running, engage reverse
gear.
 Move control A to the right or to the left to
select the corresponding mirror.
The glass of the mirror selected tilts
downwards, in accordance with its
programming.
Switching off
 Exit reverse gear and wait ten seconds.
or
 Return control A to the central position.
The mirror glass returns to its initial position.
The mirror glass also returns to its initial
position:
- if the speed exceeds 6 mph (10 km/h),
- if the engine is switched off.