CITROEN DS4 Owner's Handbook Manual page 137

Rear wiper
If a significant accumulation of snow or
ice is present, or when using a tailgate
bicycle carrier, deactivate the automatic
rear wiper via the vehicle configuration
menu.
B. Rear wiper selection ring: turn the ring
to place the desired symbol against the
marking.
Park.
Intermittent wipe.
Wash-wipe.
Turn the ring to its stop/the rear
screen wash, then the rear wiper
operates for a set duration.
Reverse gear
When reverse gear is engaged, the rear wiper
will come into operation if the windscreen
wipers are operating.
Programming
The function is activated or
deactivated via the vehicle
configuration menu.
This function is activated by default.
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Visibility