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first be taught-in to the tyre pressure monitor.
If there is a substantial loss of pressure, the
warning threshold for the warning message is
aligned to the reference values taught-in.
Restart the tyre pressure monitor after
adjusting to the cold tyre pressure
(
page 322). The current pressures are
Y
saved as new reference values. This will
ensure that a warning message will only
appear if the tyre pressure drops significantly.
The tyre pressure monitor does not warn you
of an incorrectly set tyre pressure. Observe
the notes on the recommended tyre pressure
(
page 318).
Y
The tyre pressure monitor is not able to warn
you of a sudden loss of pressure, e.g. if the
tyre is penetrated by a foreign object. In the
event of a sudden loss of pressure, bring the
vehicle to a halt by braking carefully. Avoid
abrupt steering manoeuvres.
The tyre pressure monitor has a yellow warn-
ing lamp in the instrument cluster for indicat-
ing a pressure loss or malfunction. Depending
on how the warning lamp flashes or lights up,
a tyre pressure that is too low or a malfunc-
tion in the tyre pressure monitor is indicated:
if the warning lamp is lit continuously, the
R
tyre pressure on one or more tyres is sig-
nificantly too low. The tyre pressure moni-
tor is not malfunctioning.
if the warning lamp flashes for around a
R
minute and then remains lit constantly, the
tyre pressure monitor is malfunctioning.
i
In addition to the warning lamp, a mes-
sage appears in the multifunction display.
Further information can be found under
(
page 243).
Y
If the tyre pressure monitor is malfunctioning,
it may take more than ten minutes for the tyre
pressure warning lamp to inform you of the
malfunction by flashing for approximately one
minute and then remaining lit. When the fault
has been rectified, the tyre pressure warning
lamp goes out after you have driven for a few
minutes.
The tyre pressure values indicated by the on-
board computer may differ from those meas-
ured at a filling station using a pressure
gauge. The tyre pressures shown by the on-
board computer refer to those measured at
sea level. At high altitudes, the tyre pressure
values indicated by a pressure gauge are
higher than those shown by the on-board
computer. In this case, do not reduce the tyre
pressures.
The operation of the tyre pressure monitor
can be affected by interference from radio
transmitting equipment (e.g. radio head-
phones, two-way radios) that may be being
operated in or near the vehicle.
Checking the tyre pressure electroni-
cally
Make sure that the key is in position 2
X
(
page 141) in the ignition lock.
Y
Press the = or ; button on the steer-
X
ing wheel to select the
Press the 9 or : button to select
X
Tyre pressure
Tyre
pressure.
Press the a button.
X
The current tyre pressure for each wheel
will be displayed in the multifunction dis-
play.
If the vehicle has been parked for over
20 minutes, the
Tyre pressures
Tyre
displayed after a few minutes of
displayed after a few minutes of
driving
driving
message appears.
After a teach-in period, the tyre pressure
monitor automatically detects new wheels or
new sensors. As long as a clear allocation of
the tyre pressure values to the individual
wheels is not possible, the
monitor active
monitor active
display message is shown
instead of the tyre pressure display. The tyre
pressures are already being monitored.
i
If an emergency spare wheel is fitted, for
a few minutes the system may continue to
show the tyre pressure of the wheel that
has been removed. If this occurs, note that
the value displayed for the position where
Tyre pressure
Serv.
Serv.
menu.
pressures will
will be be
Tyre pressure
Tyre pressure
Z
321
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