CITROEN DS3 Owner's Handbook Manual page 178

Programming
Turn thumb wheel 1 to the "CRUISE"
position: the cruise control mode is
selected but is not switched on (PAUSE).
Set the programmed speed by accelerating
to the required speed, then press button 2
or 3 (e.g.: 70 mph (110 km/h)).
You can then change the programmed speed using buttons 2 and 3 :
- by + or - 1 mph (km/h) = short press,
- by + or - 5 mph (km/h) = long press,
- in steps of + or - 5 mph (km/h) = maintained press.
Switch off the cruise control by pressing button 4 : the screen
confirms that it has been switched off (PAUSE).
Switch the cruise control back on by pressing button 4 again.
Exceeding the programmed speed
Intentional or unintentional exceeding of the programmed speed results
in flashing of this speed in the screen.
Return to the programmed speed, by means of intentional or unintentional
deceleration of the vehicle, automatically cancels the flashing of the speed.
Leaving cruise control mode
Turn thumb wheel 1 to the "0" position: the cruise control mode is
deselected. The display returns to the distance recorder.
Operating fault
In the event of a cruise control malfunction,
the speed is cleared resulting in flashing of the
dashes. Have it checked by a CITROËN dealer
or a qualified workshop.
When the cruise control is switched on,
be careful if you maintain the pressure on
one of the programmed speed changing
buttons: this may result in a very rapid
change in the speed of your vehicle.
Do not use the cruise control on slippery
roads or in heavy traffic.
On a steep descent, the cruise control
will not be able to prevent the vehicle
from exceeding the programmed speed.
To avoid any risk of jamming of the
pedals:
- ensure that the mat is positioned
correctly,
- never fit one mat on top of another.