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422 Wheels and tyres
Tyre pressure monitoring system
Function of the tyre pressure monitoring sys‐
tem
The system checks the tyre pressure and the
tyre temperature of the tyres fitted to the vehicle
by means of a tyre pressure sensor.
New tyre pressure sensors, e.g. in winter tyres,
are automatically taught-in during the first jour‐
ney they are used.
The tyre pressure and the tyre temperature
appear in the multifunction display
(
page 422).
/
If there is a substantial pressure loss or if the
tyre temperature is excessive, you will be
warned in the following ways:
via display messages
R
(
page
/
487)
via the h warning lamp in the instrument
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cluster (
page 515)
/
The tyre pressure monitoring system is only an
aid. It is the driver's responsibility to set the tyre
pressure to the recommended cold tyre pressure
suitable for the operating situation. Set the tyre
pressure for cold tyres using a tyre pressure
gauge. Note that the correct tyre pressure for
the current operating situation must first be
taught-in to the tyre pressure monitoring sys‐
tem.
In most cases, the tyre pressure monitoring sys‐
tem will automatically update the new reference
values after you have changed the tyre pressure.
You can, however, also update the reference val‐
ues by restarting the tyre pressure monitoring
system manually (
page 423).
/
System limits
The system may be impaired or may not function
in the following situations:
The tyre pressure has been set incorrectly.
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There is a sudden pressure loss caused, for
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example, by a foreign object penetrating the
tyre.
There is a malfunction caused by another
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radio signal source.
Make sure to observe the following further rela‐
ted subject:
Notes on tyre pressure (
/
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Checking the tyre pressure with the tyre
pressure monitoring system
Requirements:
The ignition is switched on.
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On-board computer:
Service
Tyres
4
5
One of the following displays appears:
Current tyre pressure of each wheel:
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page 420)
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