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too low. The tire pressure monitor is not mal-
functioning.
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if the warning lamp flashes for around a
minute and then remains lit constantly, the
tire pressure monitor is malfunctioning.
In addition to the warning lamp, a message
appears in the multifunction display. Observe
the information on display messages
(Y page 250).
It may take up to ten minutes for a malfunction
of the tire pressure monitor to be indicated. A
malfunction will be indicated by the tire pres-
sure warning lamp flashing for approximately
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 gauge. The
tire pressures shown by the on-board computer
refer to those measured at sea level. At high
altitudes, the tire pressure values indicated by a
pressure gauge 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 transmit-
ting 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 131) in the ignition lock.
X
Press ò on the steering wheel to call up
the menu list.
X
Press 9 or : on the steering wheel to
select the ServiceService menu.
X
Confirm by pressing a on the steering
wheel.
X
Press 9 or : to select Tire Pres‐Tire Pres‐
suresure.
X
Press a to confirm.
The multifunction display shows the current
tire pressure of each wheel.
If the vehicle was parked for longer than
20 minutes, the following message appears:
TireTire pressurepressure willwill bebe displayeddisplayed afterafter
driving a few minutesdriving a few minutes.
After a teach-in process, the tire pressure mon-
itor 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
Tire PressurePressure MonitorMonitor ActiveActive
message is shown instead of the tire pressure
display. The tire pressures are already being
monitored.
Tire pressure monitor warning mes-
sages
If the tire pressure monitor detects a pressure
loss in one or more tires, a warning message is
shown in the multifunction display. The yellow
tire pressure warning lamp then lights up.
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If the Please Correct Tire PressurePlease Correct Tire Pressure
message appears in the multifunction display,
the tire pressure in at least one tire is too low.
The tire pressure must be corrected when the
opportunity arises.
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If the Check TiresCheck Tires message appears in the
multifunction display, the tire pressure in one
or more tires has dropped significantly. The
tires must be checked.
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If the WarningWarning TireTire MalfunctionMalfunction message
appears in the multifunction display, the tire
pressure in one or more tires has dropped
suddenly. The tires must be checked.
Be sure to observe the instructions and safety
notes in the display messages in the "Tires" sec-
tion (Y page 250).
If the wheel positions on the vehicle are rotated,
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 pres-
sures 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 cur-
rently set tire pressures as the reference values
for monitoring. In most cases, the tire pressure
monitor will automatically detect the new refer-
ence 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 recommen-
ded for the corresponding driving situation on
Tire pressure
339
Wheels and tires
Z
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