CITROËN C3 Handbook page 190

Driving
Deactivation / Activation
Deactivation or activation of the system is done
via the vehicle configuration menu.
The system will be deactivated
automatically if a trailer is being
towed or a bicycle carrier is fitted on
a towbar (vehicle fitted with a towbar
installed in line with the manufacturer's
recommendations).
188
Operating fault
In the event of a fault, when reverse
gear is engaged, this warning lamp
lights up in the instrument panel,
accompanied by a message and an
audible signal.
Contact a CITROËN dealer or a qualified
workshop to have the system checked.
In bad or wintry weather, ensure that
the sensors are not covered with mud,
ice or snow. When reverse gear is
engaged, an audible signal (long beep)
indicates that the sensors may be dirty.
Certain sound sources (motorcycle,
lorry, pneumatic drill, etc.) may trigger
the audible signals of the parking
sensor system.
High pressure jet wash
When washing your vehicle, do not
direct the lance within 30 cm of the
sensors.