2)
Valid to use for a short time as a spare wheel
on the rear axle for a maximum distance of
100 km and a maximum speed of 55 km/h.
Be sure to also observe the following further rela‐
ted subjects:
R
notes on tyre pressure (
/
page 314)
Tyre pressure monitor
Function of tyre pressure monitor on Single
tyres
The system checks the tyre pressure and the
temperature of the tyres fitted to the vehicle by
means of a tyre pressure sensor.
New tyre pressure sensors, e.g. in winter tyres,
are automatically taught-in the first time they are
driven.
The tyre pressure and the tyre temperature
appear in the multifunction display
(
/
page 182).
If there is a substantial loss of tyre pressure, a
warning is issued:
R
via display messages (
/
page 376)
R
via the
h
warning lamp in the instrument
cluster
It is the driver's responsibility to set the tyre pres‐
sure to the recommended cold tyre pressure suit‐
able for the operating situation. Set the tyre pres‐
sure for cold tyres using a tyre pressure gauge.
Note that the correct tyre pressure for the cur‐
rent operating situation must first be taught-in to
the tyre pressure monitoring system.
In most cases, the tyre pressure monitoring sys‐
tem will automatically update the new reference
values after you have changed the tyre pressure.
You can, however, also update the reference val‐
ues by restarting the tyre pressure monitoring
system manually (
/
page 330).
System limitations
The system may be impaired or may not function
in the following situations:
R
if the tyre pressure is set incorrectly
R
if there is a sudden pressure loss caused by a
foreign object penetrating the tyre, for exam‐
ple
R
if there is a malfunction caused by another
radio signal source
Make sure to observe the following further rela‐
ted subject:
R
Notes on tyre pressure (
/
page 314)
Checking the tyre pressure with the tyre
pressure monitoring system
Requirements:
R
the ignition is switched on
On-board computer:
4
Service
5
Tyres
One of the following displays appears:
R
the current tyre pressure and tyre tempera‐
ture of the individual wheels
Instrument display with colour display
R
the current tyre pressure for each wheel
Instrument display with black and white display
R
Tyre pressures will be displayed after a few
minutes of driving
: the teach-in process of the
system is not yet complete. The tyre pres‐
sures are already being monitored.
#
Compare the tyre pressure with the recom‐
mended tyre pressure for the current operat‐
ing condition . Observe the notes on tyre tem‐
perature (
/
page 314).
Wheels and tyres 329
