CITROEN C4 Handbook page 134

Driving
– When overtaken by a vehicle, the speed
difference is less than 16 mph (25 km/h).
– Traffic is flowing normally.
– Overtaking a vehicle over a certain period of
time and the vehicle being overtaken remains in
the blind spot.
– You are driving on a straight or slightly curved
road.
– Your vehicle is not pulling a trailer, a caravan,
etc.
Operating limits
132
No alert is triggered in the following conditions:
– presence of stationary objects (e.g. parked
vehicles, safety rails, lampposts, signs).
– vehicles travelling in the opposite direction.
– on winding roads or in case of sharp turns.
– when overtaking or being overtaken by a
very long vehicle (e.g. truck, bus), which is both
detected in a blind spot from behind and present
in the driver's field of vision from the front.
– quick overtaking manoeuvre.
– very heavy traffic: vehicles detected in front
and behind are confused with a lorry or a
stationary object.
– activation of the Park Assist function.
Malfunction
If the event of a malfunction, this warning
lamp lights up on the instrument panel,
accompanied by the display of a message.
Have it checked by a CITROËN dealer or a
qualified workshop.
The system may be temporarily disturbed
by certain weather conditions (e.g. rain,
hail).
In particular, driving on a wet road or going
from a dry to a wet area can cause false
alerts (e.g. presence of a cloud of water
droplets in the blind spot interpreted as a
vehicle).
In bad or wintry weather, ensure that the
sensors are not covered by mud, ice or snow.
Take care not to cover the warning zone in
the door mirrors, or the detection zones on
the front and rear bumpers with adhesive
labels or other objects; they may hamper
correct operation of the system.
Active Safety Brake with
Collision Risk Alert and
Intelligent emergency
braking assistance
For more information, refer to the
General recommendations on the use
of driving and manoeuvring aids.