Parking Sensors; Rear Parking Sensors - CITROËN C4 Handbook

Driving
Parking sensors
This system indicates the proximity of an
obstacle (person, vehicle, tree, gate, etc.)
which comes within the field of detection of
sensors located in the bumper.
Certain types of obstacle (stake, roadworks
cone, etc.) detected initially will no longer be
detected at the end of the manoeuvre, if they
are located in blind spots in the sensors' field
of detection.
This system cannot in any circumstances replace
the need for vigilance on the part of the driver.
206

Rear parking sensors

The system is switched on by engaging reverse
gear.
This is confirmed by an audible signal.
The system is switched off when you come out
of reverse gear.
Audible assistance
The proximity information is given by an
intermittent audible signal, the frequency of which
increases as the vehicle approaches the obstacle.
The sound emitted by the speaker (right or left)
indicates the side on which the obstacle is located.
When the distance between the vehicle and
the obstacle becomes less than approximately
thirty centimetres, the audible signal becomes
continuous.
Visual assistance
This supplements the audible signal by
displaying bars in the screen which move
progressively nearer to the vehicle.
When the obstacle is very close, the "Danger"
symbol is displayed in the screen.