Lane Departure Warning System - CITROËN C4 Handbook

Driving
Lane departure warning system
System which detects the involuntary crossing
of longitudinal traffic lane markings on the
ground (solid or broken line).
Sensors, fitted below the front bumper, trigger
a warning if the vehicle drifts over a lane
marking (speed higher than 50 mph (80 km/h)).
This system is particularly useful on motorways
and main roads.
The lane departure warning system
cannot in any circumstances replace
the need for vigilance on the part of the
driver.
It is necessary to observe driving
regulations and take a break every
two hours.
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Activation
F When switching the ignition on or with
the engine running, press this button; the
indicator lamp comes on.
Deactivation
F Press this button again, the indicator lamp
goes off.
The status of the system remains in the
memory when the ignition is switched off.
Detection
You are warned by the vibration of the driver's
seat cushion:
- on the right-hand side, if the marking on
the ground has been crossed on the right,
- on the left-hand side, if the marking on the
ground has been crossed on the left.
No warning is transmitted while the direction
indicator is active and for approximately
20 seconds after the direction indicator is
switched off.
A warning may be transmitted if a direction
marking (e.g. arrow) or non-standard marking
(e.g. graffiti) is crossed.
Operating fault
In the event of a malfunction, the
service warning lamp comes on,
accompanied by an audible signal
and a message in the screen.
Contact a CITROËN dealer or a qualified
workshop.
The detection may be impeded:
- if the sensors are dirty (mud, snow...),
- if the markings on the ground are
worn,
- if there is little contrast between the
markings on the ground and the
road surface.