CITROEN DS5 Owner's Handbook Manual page 174

Tyre under-infl ation detection
System which automatically checks the pressure of the tyres while driving.
Sensors fitted in each valve trigger a warning in
the event of malfunction (speed above 12 mph
(20 km/h)).
The spare wheel is not fitted with a sensor.
The tyre under-inflation detection
system is an aid to driving which does
not replace the need for the driver to be
vigilant or to drive responsibly.
Under-infl ated tyre
A message appears in the instrument panel
screen, accompanied by an audible signal,
to identify the wheel concerned.
Check the tyre pressures as soon as possible.
This check must be carried out when the tyres
are cold.
Puncture
This warning lamp and
the STOP warning lamp
come on, accompanied
by an audible signal and a message in the
instrument panel screen identifying the wheel
concerned.
Stop immediately, avoiding any sudden
movement of the steering wheel and the brakes.
Change the damaged wheel (punctured
or very deflated tyre), and have the tyre
pressure checked as soon as possible.
Sensor(s) not detected or faulty
A message appears in the instrument panel
screen, accompanied by an audible signal,
to identify the wheel or wheels which are not
detected or to indicate a fault in the system.
Contact a CITROËN dealer or a qualified
workshop to replace the faulty sensor(s).
This message is also displayed when
one of the wheels is away from the
vehicle (being repaired) or when one or
more wheels without a sensor are fitted.
All repairs and changing of tyres on a
wheel fitted with this system must be
carried out by a CITROËN dealer or a
qualified workshop.
If, when changing a tyre, you install a
wheel which is not detected by your
vehicle (example: fitting of snow tyres),
you must have the system reinitialised
by a CITROËN dealer or a qualified
workshop.
This system does not avoid the need
to have the tyre pressures checked
regularly (refer to "Identification
markings") to ensure that the optimum
dynamic performance of the vehicle
is maintained and prevent premature
wear of the tyres, particularly in arduous
driving conditions (heavy load, high
speed).
The tyre pressures must be checked
cold, at least once a month. Remember
to check the pressure of the spare
wheel.
The tyre under-inflation detection
system may experience temporary
interference due to electromagnetic
signals on a frequency close to that
used by the system.