DS Automobiles DS 4, Handbook

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Driving
Parking sensors
This system indicates the proximity of an
obstacle (e.g. pedestrian, vehicle, tree, gate)
which comes within the field of detection of
sensors located in the bumper.
Certain types of obstacle (e.g. stake,
roadworks cone) 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.
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.
Rear parking sensors
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-hand or
left-hand) 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
Audible 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.