PEUGEOT 508 Handbook page 142

Safety
Deactivation
Only the passenger's front airbag can be
deactivated:
F insert the key in the passenger airbag
deactivation switch,
F turn it to the "OFF" position,
F then, remove the key keeping the switch in
the new position.
According to version, this warning
lamp comes on either in the
instrument panel or in the seat belt
and passenger's front airbag warning
lamp display when the ignition is on
and until the airbag is reactivated.
140
to assure the safety of your child,
the passenger's front airbag must be
deactivated when you install a rearward
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, with the
ignition off, 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
lamp 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, accompanied by
an audible warning and a message
in the instrument panel screen, contact a
PeugeOt dealer or a qualified workshop to
have the system checked. the airbags may no
longer be deployed in the event of a serious
impact.