CITROEN Grand C4 PICASSO Owner's Handbook Manual page 227

Under-inflation alert
This is given by fixed illumination of
this warning lamp, accompanied by
an audible signal and, depending on
equipment, the display of a message.
Reduce speed immediately, avoid
excessive steering movements and sudden
braking .
Stop the vehicle as soon as it is safe
to do so.
The loss of pressure detected does not
always cause visible bulging of the tyre.
Do not satisfy yourself with just a visual
check.
In the event of a puncture, use the
temporary puncture repair kit or the spare
wheel (depending on equipment),
or
if you have a compressor, such as the one
in the temporary puncture repair kit, check
the pressures of the four tyres when cold,
or
if it is not possible to make this check
immediately, drive carefully at reduced
speed.
The alert is maintained until the system
is reinitialised.
Reinitialisation
A label reminds you of the need to reinitialise
the system every time one or more tyre
pressure is adjusted, and after changing one or
more wheels.
Safety
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