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stantly, the tire pressure monitor is malfunc-
tioning.
In addition to the warning lamp, a message
appears in the multifunction display. Observe
the information on display messages
(Y page 227).
It may take up to ten minutes for a malfunc-
tion of the tire pressure monitor to be indica-
ted. A malfunction will be indicated by the tire
pressure warning lamp flashing for approx-
imately one minute and then remaining lit.
When the malfunction has been rectified, the
tire pressure warning lamp goes out after a
few minutes of driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at a gas station with a pressure gage. The
tire pressures shown by the on-board com-
puter refer to those measured at sea level. At
high altitudes, the tire pressure values indica-
ted by a pressure gage are higher than those
shown by the on-board computer. In this case,
do not reduce the tire pressures.
The operation of the tire pressure monitor can
be affected by interference from radio trans-
mitting equipment (e.g. radio headphones,
two-way radios) that may be being operated in
or near the vehicle.
Checking the tire pressure electroni-
cally
X
Make sure that the SmartKey is in position
2 (Y page 126) in the ignition lock.
X
Press the = or ; button on the steer-
ing wheel to select the Serv.Serv. menu.
X
Press the 9 or : button to select
Tire PressureTire Pressure.
X
Press a.
The current tire pressure of each tire is
shown in the multifunction display.
If the vehicle has been parked for over
20 minutes, the Tire pressure will beTire pressure will be
displayed after driving a few minutesdisplayed after driving a few minutes
message appears.
After a teach-in process, the tire pressure
monitor automatically detects new wheels or
new sensors. As long as a clear allocation of
the tire pressure value to the individual wheels
is not possible, the Tire Pressure MonitorTire Pressure Monitor
ActiveActive display message is shown instead of
the tire pressure display. The tire pressures
are already being monitored.
Tire pressure monitor warning mes-
sages
The tire pressure monitor detects a pressure
loss in one or more tires:
R
If the tire pressure monitor detects a pres-
sure loss in one or more tires, a warning
message is shown in the multifunction dis-
play. The yellow tire pressure warning lamp
then lights up.
R
If the Please Correct Tire PressurePlease Correct Tire Pressure
message appears in the multifunction dis-
play, the tire pressure in at least one tire is
too low. The tire pressure must be corrected
when the opportunity arises.
R
If the Check TiresCheck Tires message appears in the
multifunction display, the tire pressure in at
least one tire has dropped significantly. The
tires must be checked.
R
If the Warning Tire MalfunctionWarning Tire Malfunction mes-
sage appears in the multifunction display,
the tire pressure in at least one tire has
dropped suddenly. The tires must be
checked.
Observe the instructions and safety notes in
the display messages in the "Tires" section
(Y page 227).
If the wheel positions on the vehicle are rota-
ted, the tire pressures may be displayed for
the wrong positions for a short time. This is
rectified after a few minutes of driving, and the
tire pressures are displayed for the correct
positions.
Restarting the tire pressure monitor
When you restart the tire pressure monitor, all
existing warning messages are deleted and the
warning lamps go out. The monitor uses the
currently set tire pressures as the reference
values for monitoring. In most cases, the tire
pressure monitor will automatically detect the
new reference values after you have changed
the tire pressure. However, you can also set
reference values manually as described here.
The tire pressure monitor then monitors the
new tire pressure values.
X
Set the tire pressure to the value recom-
mended for the corresponding driving situa-
tion on the Tire and Loading Information
placard on the driver's side B-pillar
(Y page 296).
Tire pressure
301
Wheels and tires
Z
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