CITROEN C3 AIRCROSS Handbook page 46

Driving
Rear parking sensors
The system is switched on by engaging reverse
gear.
The system is switched off when disengaging
reverse gear.
Audible assistance
The system signals the presence of obstacles
within the sensors' detection zone.
The proximity information is given by an
intermittent audible signal, the frequency of
which increases as the vehicle approaches the
obstacle.
When the distance between the vehicle
and the obstacle becomes less than about
60 centimetres, the audible signal becomes
continuous.
Operating limits
If the boot is heavily loaded, the vehicle may
tilt, affecting distance measurements.
Manoeuvring aids cannot, in any
circumstances, replace the need for
vigilance on the part of the driver.
The driver must always check the
surroundings of the vehicle before and
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during the whole manoeuvre, in particular
using the mirrors.