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The system checks the tire pressure and the tire
temperature of the tires installed on the vehicle
by means of a tire pressure sensor.
New tire pressure sensors, e.g. in winter tires,
are automatically taught-in during the f irst jour‐
ney they are used.
If there is a substantial pressure loss or if the
tire temperature is excessive, you will be warned
in the following ways:
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via display messages ( → page 450)
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via the h warning lamp in the instrument
cluster (→ page 474)
The tire pressure monitoring system is only an
aid. It is the driver's responsibility to set the tire
pressure to the recommended cold tire pressure
suitable for the operating situation. Set the tire
pressure for cold tires using a tire pressure
gauge. Note that the cor rect tire pressure for the
current operating situation must fir st be taught-
in to the tire pressure monitoring system.
In most cases, the tire pressure monitoring sys‐
tem will automatically update the new reference
values after you have changed the tire pressure.
You can, however, also update the reference val‐
ues by restarting the tire pressure monitoring
system manually (
→ page 383).
System limitations
The system may be impaired or may not function
in the following situations:
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If the tire pressure is set incorrectly
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If there is a sudden pressure loss caused, for
example, by a foreign object penetrating the
tire
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If there is a malfunction caused by another
radio signal source
Make sure to observe the following further rela‐
ted subject:
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Notes on tire pressure (→ page 377)
Checking the tire pressure with the tire pres‐
sure monitoring system
Requirements:
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The ignition is switched on.
On-board computer:
,
Service
.
Tires
One of the following displays appears:
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Current tire pressure of each wheel:
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Tire pressure will be displayed after driving a
few minutes
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Tire Pressure Monitor Active: the teach-in
process of the system is not yet complete.
The tire pressure are already being moni‐
tored.
#
Compare the tire pressure with the recom‐
mended tire pressure for the current operat‐
ing condition (→ page 379). Observe the
notes on tire temperature (→ page 377).
%
The values displayed in the multifunction dis‐
play may deviate from those of the tire pres‐
sure gauge as they refer to sea level. At high
altitudes, the tire pressure value indicated by
a pressure gauge are higher than those
shown by the on-board computer. In this
case, do not reduce the tire pressure.
382
Wheels and tires
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