Vehicle care 153
Low tyre pressure condition
A detected low tyre pressure
condition is indicated by illumination
of control indicator w 3 83 together
with a warning chime. In vehicles with
Multifunction version of the Driver
Information Centre (DIC), a
corresponding message is also
displayed.
If w illuminates, stop as soon as
possible and inflate the tyres as
recommended 3 180.
After inflating, driving may be
required to update the tyre pressure
values in the system. During this time
w may illuminate.
If
w illuminates at lower temperatures
and extinguishes after some driving,
this could be an indicator for
approaching a low tyre pressure
condition. Check tyre pressure of all
four tyres.
If the tyre pressure must be reduced
or increased, switch off ignition.
Only mount wheels with pressure
sensors, otherwise the tyre pressure
value cannot be recognised by the
system and w flashes for several
seconds then illuminates
continuously. In vehicles with
Multifunction version of the DIC, a
corresponding message is also
displayed.
A spare wheel or temporary spare
wheel is not equipped with pressure
sensors. TPMS is not operational for
these wheels. For the further three
wheels, TPMS remains operational.
Spare wheel 3 159, Wheel changing
3 158.
Control indicator w and (depending
on version) a corresponding message
appears at each ignition cycle until
the tyres are inflated to the correct
tyre pressure.
Driver Information Centre (DIC) 3 86.
Temperature dependency
Tyre pressure depends on the
temperature of the tyre. During
driving, tyre temperature and
pressure increase.
Tyre pressure values provided on the
tyre information label and tyre
pressure chart are valid for cold tyres,
which means at 20 °C. The pressure
increases by nearly 10 kPa (0.1 bar)
for a 10 °C temperature increase.
This must be considered when warm
tyres are checked.
Relearn function
After changing wheels, TPMS needs
to recalculate. The relearn process
takes up to 20 minutes of driving with
a minimum speed of 24 km/h.
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