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vehicle to a halt by braking carefully. Avoid
abrupt steering movements.
The tire pressure monitor has a yellow warning
lamp in the instrument cluster for indicating
pressure loss or a malfunction. Whether the
warning lamp flashes or lights up indicates
whether a tire pressure is too low or the tire
pressure monitor is malfunctioning:
R
if the warning lamp is lit continuously, the
tire pressure on one or more tires is signifi-
cantly too low. The tire pressure monitor is
not malfunctioning.
R
if the warning lamp flashes for approx-
imately a minute and then remains lit con-
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 201).
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 118) 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 Pressure
Tire 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.
If an emergency spare wheel is mounted, the
system may continue to show the tire pressure
of the wheel that has been removed for a few
minutes. Be aware that the value displayed for
the position where the emergency spare wheel
is fitted is not the same as the current tire
pressure of the emergency spare wheel.
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 Pressure
Please 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 201).
276
Tire pressure
Wheels and tires
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