CITROËN C4 PICASSO Handbook page 172

Driving
When the cruise control is paused,
it can only be reactivated when all of
the safety conditions are met. The
message "Activation not possible,
conditions unsuitable" is displayed while
reactivation is not possible.
Wait until the speed of the vehicle
is close to the speed setting before
reactivating the system - by pressing
button 2 or 3 - in order to set your
current speed as the new speed setting.
170
Modification of the speed setting
Engine running and cruise control on (green),
you can modify the speed setting.
Modification from the current
speed
F By successive short presses on button 2 or
3, to raise or lower the setting in steps of +
or - 1 mph (km/h),
F By a maintained press on button 2 or 3,
to raise or lower the setting in steps
of + or - 5 mph (km/h).
Take care: a prolonged press on
button 2 or 3 will cause a very quick
change in the speed of your vehicle.
Modification from the speed limit
recognition system
F The speed to be memorised is displayed in
the instrument panel.
F Make an initial press on button 5; a
message is displayed to confirm the
memorisation request.
F Press button 5 again to save the suggested
speed.
The speed is then displayed in the instrument
panel as the new speed setting.
For more information on Speed limit
recognition and its memorisation, refer to the
corresponding section.
As a precaution, it is recommended that
you select a cruise speed setting close
to the current speed of your vehicle, so
as to avoid any sudden acceleration or
deceleration of the vehicle.