CITROËN C4 Handbook page 209

Front parking sensors
In addition to the rear parking sensors, the front
parking sensors are triggered when an obstacle
is detected in front and the speed of the vehicle is
still below 6 mph (10 km/h).
The front parking sensors are interrupted if the
vehicle stops for more than three seconds in
forward gear, if no further obstacles are detected
or when the speed of the vehicle exceeds 6 mph
(10 km/h).
The sound emitted by the speaker (front or
rear) indicates whether the obstacle is in front
or behind.
Deactivation/Activation of the
front and rear parking sensors
The function is deactivated by pressing this
button. The indicator lamp in the button
comes on.
Pressing this button again reactivates the
function. The indicator lamp in the button
goes off.
The function will be deactivated
automatically if a trailer is being towed
or a bicycle carrier is fitted (vehicle
fitted with a towbar or bicycle carrier
recommended by CITROËN).
Operating fault
In the event of a malfunction of
the system, when reverse gear
is engaged this warning lamp is
displayed in the instrument panel
and/or a message appears in the
screen, accompanied by an audible
signal (short beep).
Contact a CITROËN dealer or a
qualified workshop.
In bad weather or in winter, 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.
Driving
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