CITROËN DS 4 Handbook page 193

Emergency switch-off
In the event of an emergency only,
the engine can be switched of without
conditions. To do this, press and hold
the "START/STOP" button for about
3 seconds.
In this case the steering column locks as soon
as the vehicle stops.
Electronic key not
recognised
If the electronic key is no longer in the
recognition zone when driving or when you
(later) request switching off the engine, a
message is displayed.
F Press and hold the "START/
STOP" button for about
3 seconds if you want to force
switching off the engine (note
that restarting will not be
possible without the key).
Ignition on position
(without starting)
With the Keyless Entry and Starting key inside
the vehicle, pressing the "START/STOP"
button, with no action on the pedals, allows
the ignition to be switched on.
F Press the "START/STOP" button,
the instrument panel comes on
but the engine does not start.
F Press the button again to switch off the
ignition and so allow the vehicle to be
locked.
With the ignition on, the system
automatically goes into energy
economy mode when required to
maintain the state of charge of the
battery.
191
Driving