CITROEN DS4 Owner's Handbook Manual page 185

Airbags
System designed to maximise the safety of the
occupants (with the exception of the rear centre
passenger) in the event of violent collisions.
It supplements the action of the force-limiting
seat belts (with the exception of the rear centre
passenger).
If a collision occurs, the electronic detectors
record and analyse the front and side impacts
sustained in the impact detection zones:
- in the case of a serious impact, the airbags
are deployed instantly and protect the
occupants of the vehicle (with the exception
of the rear centre passenger); immediately
after the impact, the airbags deflate rapidly
so that they do not hinder visibility or the
exit of the occupants,
- in the case of a minor or rear impact or in
certain roll-over conditions, the airbags
will not be deployed; the seat belt alone is
sufficient to provide optimum protection in
these situations.
The airbags do not operate when the
ignition is switched off.
This equipment will only deploy once.
If a second impact occurs (during the
same or a subsequent accident), the
airbag will not be deployed again.
Impact detection zones
A. Front impact zone.
B. Side impact zone.
Deployment of the airbag(s) is
accompanied by a slight emission
of harmless smoke and a noise, due
to the activation of the pyrotechnic
cartridge incorporated in the system.
This smoke is not harmful, but sensitive
individuals may experience slight
irritation.
The noise of the detonation may result in
a slight loss of hearing for a short time.
183
Safety