CITROEN C4 Handbook page 126

Driving
All operating conditions are met; the system is
active.
(orange)
System malfunction.
If the driver no longer wishes to use the system
for some time, they can deactivate it by pressing
the button again (confirmed when the symbol
disappears).
The system status is saved when the
ignition is switched off.
Operating conditions
– Adaptive cruise control active.
– ESC system operational.
– ASR system activated.
– No trailer detected.
– No 'space-saver' spare wheel in use.
– Vehicle not subject to strong lateral g-forces.
– Direction indicators not activated.
Regulation
The driver must hold the steering wheel
properly.
When regulation is activated, the symbols are
displayed in green: with small steering inputs,
the system steers the vehicle and keeps it in the
position chosen by the driver in the traffic lane.
This position is not necessarily the centre of the
lane.
The driver can feel movements in the steering
wheel.
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At any time, the driver can change the position of
the vehicle by intervening on the steering wheel
and maintaining the position until the system has
taken it into account. If the chosen position is too
off-centre, an automatic re-centering manoeuvre
can occur. The system adjusts to the newly
defined position.
Pausing/Suspending the
system
The driver must act promptly if they
believe that the traffic conditions or the
state of the road surface require their
intervention, by moving the steering wheel to
temporarily suspend system operation. Any
action on the brake pedal that causes the
Adaptive cruise control system to be paused
will also cause the system to be paused.
If the system detects that the driver is not
holding the wheel firmly enough, it
triggers a series of gradual alerts and then
deactivates itself if there is no response from
the driver.
If the function is suspended due to the
prolonged release of the force holding
the steering wheel, the system must be
reactivated by pressing the button again.
Automatic suspension
Suspension of the system is accompanied by a
specific audible signal.
– Triggering of the ESC system.
– Insufficient lane detection. In this case, the
Lane keeping assist function can take over,
and the system will reactivate itself once the
operating conditions are met again.
Paused by the driver
– Travelling outside the lane limits.
– Too tight a grip on the steering wheel or
dynamic action on the steering wheel.
– Action on the brake pedal (resulting in a pause
until cruise control is reactivated) or accelerator
pedal (suspension for as long as the pedal is
depressed).
– Pausing of the Adaptive cruise control system.
– Deactivation of the ASR system.