CITROEN DS5 Owner's Handbook Manual page 125

Going into engine START mode
The "ECO" warning lamp goes off
and the engine starts automatically
with the electronic gearbox system :
● gear lever in position A or M , release the
brake pedal,
● or gear lever in position N and the brake
pedal released, move the gear lever to
position A or M,
● or engage reverse gear.
Special cases: START invoked
automatically
START mode is invoked automatically when:
- the driver's door is open,
- the driver's seat belt is not fastened,
- the speed of the vehicle exceeds 7 mph
(11 km/h) with the electronic gearbox
system,
- the electric parking brake is being applied,
- some special conditions (battery charge,
engine temperature, braking assistance,
ambient temperature...) where the engine is
needed for control of a system.
In this case the "ECO" warning
lamp flashes for a few seconds, then
goes off.
This operation is perfectly normal.
Deactivation
At any time, press the "ECO OFF" switch to
deactivate the system.
This is confirmed by the switch warning lamp
coming on accompanied by a message in the
screen.
If the system has been deactivated
in STOP mode, the engine restarts
immediately.
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Driving