CITROEN C1 2015 Handbook page 114

Safety
Operating faults
Sensor fault
The operation of the laser sensor may suffer
interference from accumulations of dirt or
misting of the windscreen.
In this case you are warned by the
display of this flashing warning lamp
in the instrument panel.
Use the windscreen demisting and regularly
clean the area of the windscreen in front of the
sensor.
Do not stick or otherwise fix any object
on the windscreen in front of the sensor.
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System fault
In the event of a malfunction of
the system, you are warned by the
display of this flashing warning lamp
in the instrument panel.
Have the system checked by a CITROËN
dealer or a qualified workshop.
In the event of an impact to the
windscreen at the sensor, deactivate
the system and contact a CITROËN
dealer or a qualified workshop to have
your windscreen replaced.
Never try to remove, adjust or test the
sensor.
Only a CITROËN dealer or a qualified
workshop is able to work on the system.