CITROËN C4 Handbook page 30

Instruments
Deactivation indicator lamps
If one of the following indicator lamps comes on, this confirms that the corresponding system has been switched off intentionally.
This is may be accompanied by an audible signal and a message in the multifunction screen.
Warning/indicator lamp
Passenger's
airbag system
28
is on Cause
fixed in the instrument
The control switch, located in the
glove box, is set to the OFF position.
panel and/or seat belt
and front passenger's The passenger's front airbag is
airbag warning lamps deactivated.
display. You can install a rearward facing
child seat, unless there is a fault with
the airbags (airbag warning lamp on).
Action/Observations
Set the control to the "ON" position to activate the
passenger's front airbag.
In this case, do not install a rearward facing child seat
on this seat.