CITROEN C4 Aircross 2013 Owner's Handbook Manual page 112

Driving
Each attempt at starting takes around
15 seconds. If the engine does not start, press
the " START/STOP " button once more to try
again.
If one of the starting conditions is not
met, a reminder message appears in
the instrument panel screen. In some
circumstances, it is necessary to
turn the steering wheel slightly while
pressing the " START/STOP " button
to assist unlocking of the steering;
a message warns you when this is
needed.
The presence of the electronic key
in the defined zone is essential. For
reasons of safety, do not leave this area
when the engine is running.
For Diesel vehicles, when
the engine is cold starting
does not take place until the
pre-heater warning lamp has
gone off.
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The presence of the electronic key in
the vehicle is essential for switching
on the ignition and starting only. Once
the engine has started, make sure
that the electronic key remains with
the vehicle until the end of the journey:
otherwise you would not be able to lock
the vehicle.
Switching off using the
electronic key
Immobilise the vehicle.
Place the gear lever in neutral for vehicles
fitted with a manual gearbox , or on P for
vehicles fitted with a CVT gearbox .
With the electronic key inside the vehicle,
press the " START/STOP " button.
The engine stops.
The steering locks when a door is opened or on
locking the vehicle.
If the vehicle is not immobilised, the
engine will not stop.
This message is displayed
when the driver's door is
opened and the vehicle is not
in "OFF" mode.
Press the " START/STOP " button again to
change to "OFF" mode.
Switching off the engine leads to a loss
of braking assistance.