162Vehicle careNote
In countries where the tyre pressure monitoring system is legally
required, the use of wheels without
pressure sensors will invalidate the
vehicle operating permit.
Low tyre pressure condition
A detected low tyre pressure
condition is indicated by illumination
of control indicator w 3 88 together
with a warning chime. In vehicles with Multifunction version of the Driver
Information Centre, a corresponding message is also displayed.
If w illuminates, stop as soon as
possible and inflate the tyres as
recommended 3 191.
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 Driver Information Centre, a corresponding
message is also displayed.
A spare wheel or temporary spare
wheel is not equipped with pressure
sensors. The tyre pressure
monitoring system is not operationalfor these wheels. For the further three wheels, tyre pressure monitoring
system remains operational.
Spare wheel 3 168, Wheel changing
3 166.
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 3 91.
Relearn function
After changing wheels, the tyre
pressure monitoring system needs to recalculate. The relearn process
takes up to 20 minutes of driving with
a minimum speed of 20 km/h.
If problems occur during the relearn
process, control indicator w flashes
for several seconds then illuminates
continuously and (depending on
version) a warning message is
displayed in the Driver Information
Centre.
Driver Information Centre 3 91.
