CITROEN DS3 Owner's Handbook Manual page 36

Warning lamp is on
Diesel engine fixed.
pre-heating
Parking brake fixed.
Stop & Start fixed.
flashes for a
few seconds, then
goes off.
Cause
The ignition switch is at the
2nd position (ignition on).
The parking brake is applied or not
properly released.
When the vehicle stops (red lights,
traffic jams, ...) the Stop & Start
system has put the engine into STOP
mode.
STOP mode is temporarily
unavailable.
or
START mode is invoked
automatically.
Action/Observations
Wait until the warning lamp goes off before starting.
The period of illumination of the warning lamp is
determined by the climatic conditions (up to about
thirty seconds in extreme climatic conditions).
If the engine does not start, switch the ignition off and
then on, wait until the warning lamp goes off again,
then start the engine.
Release the parking brake to switch off the warning
lamp, keeping your foot on the brake pedal.
Observe the safety.
For further information on the parking brake, refer to
the "Driving" section.
The warning lamp goes off and the engine restarts
automatically in START mode, as soon as you want
to move off.
Refer to "Driving - § Stop & Start" for special cases
with STOP mode and START mode.