CITROEN Grand C4 PICASSO Owner's Handbook Manual page 202

Driving
Select reverse, release the steering wheel
and start moving without exceeding 5 mph
(8 km/h).
The assisted parking manoeuvre is in
progress.
Without exceeding 5 mph (8 km/h), follow
the instructions displayed in the instrument
panel, aided by the warnings from the
"Parking sensors" system, until the
indication of the end of the manoeuvre.
200
At the end of the manoeuvre, the operating
indicator lamp goes out in the instrument panel,
accompanied by a message and an audible
signal.
The assistance is deactivated: you can take
over control.
During a bay parking manoeuvre, the
Park Assist system is automatically
deactivated once the rear of the vehicle
is within 50 cm of an obstacle.
During parking and exit from
parking manoeuvres, the reversing
camera function may come into
operation. It facilitates monitoring
of the surroundings of the vehicle,
by displaying additional information
in the instrument panel (see the
corresponding section).