CITROEN DS3 Handbook page 150

Direction indicators
F Left: lower the lighting stalk beyond the
point of resistance.
F Right: raise the lighting stalk beyond the
point of resistance.
Three flashes of the direction
indicators
F Press briefly upwards or downwards,
without going beyond the point of
resistance; the direction indicators will
flash 3 times.
Hazard warning lamps
A visual warning by means of the direction
indicators to alert other road users to a vehicle
breakdown, towing or accident.
F Press this button, the direction indicators
flash.
They can operate with the ignition off.
Automatic operation of
hazard warning lamps
When braking in an emergency, depending on
the deceleration, the hazard warning lamps
come on automatically.
They switch off automatically the first time you
accelerate.
F You can also switch them off by pressing
the button.