CITROEN DS4 Owner's Handbook Manual page 191

Deactivation
Only the passenger's front airbag can be
deactivated:
 insert the key in the passenger airbag
deactivation switch,
 turn it to the "OFF" position,
 then, remove the key keeping the switch in
the new position.
According to version, this warning
lamp comes on in the instrument
panel and/or in the seat belt and
passenger's front airbag warning lamps display
when the ignition is on and until the airbag is
reactivated.
To assure the safety of your child,
the passenger's front airbag must
be deactivated when you install a
"rear facing" child seat on the front
passenger seat.
Otherwise, the child would risk being
seriously injured or killed if the airbag
were deployed.
Reactivation
When you remove the child seat, turn the
switch to the "ON" position to reactivate the
airbag and so assure the safety of your front
passenger in the event of an impact.
With the ignition on, this warning
lamp comes on in the seat belt and
passenger's front airbag warning
lamps display for approximately one
minute, if the passenger's front airbag
is activated.
Operating fault
If this warning lamp comes on in
the instrument panel, contact a
CITROËN dealer or a qualified
workshop to have the system checked. The
airbags may no longer be deployed in the event
of a serious impact.
189
Safety