CITROËN C5 Handbook page 118

Driving
Going into engine START
mode
The "ECO" warning lamp goes off
and the engine starts automatically:
- with a manual gearbox, when you fully
depress the clutch pedal,
- with an automatic gearbox:
● gear lever in position D or M, when you
release the brake pedal,
● or gear lever in position N and brake
pedal released, when you place the gear
lever in position D or M,
● or when you engage reverse gear.
116
Special cases: START invoked
automatically
For safety reasons or to ensure smooth
operation, START mode is invoked
automatically when:
- you open the driver's door,
- you unfasten the driver's seat belt,
- the speed of the vehicle exceeds 15 mph
(25 km/h) with a manual gearbox or 2 mph
(3 km/h) with an an automatic gearbox for
blueHdi diesel versions,
- the electric parking brake is being applied,
- some special conditions (battery charge,
engine temperature, braking assistance,
ambient temperature...) where the engine is
needed to assure control of a system.
In this case the "ECO" warning
lamp flashes for few seconds, then
goes off.
This operation is perfectly normal.
With a manual gearbox in STOP mode,
if a gear is engaged without fully
depressing the clutch pedal, a warning
lamp comes on or an alert message
is displayed asking you to depress the
clutch pedal to restart the engine.