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When the malfunction indicator is illuminated,
the system may not be able to detect or signal
low tire pressure as intended. TPMS malfunc-
tions may occur for a variety of reasons,
including the installation of replacement or
alternate tires or wheels on the vehicle that
prevent the TPMS from functioning properly.
#
The system uses a tire pressure sensor to check
the pressure and temperature of the tires fitted on
the vehicle.
The tire pressure and tire temperature appear on
the driver's display.
If there is a substantial pressure loss or if the tire
temperature is excessive, you will be warned with
display messages (
page 425) or the h
/
warning lamp on the driver's display
(
page 449).
/
The tire pressure monitor 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.
In most cases, the tire pressure monitor will auto-
matically update the new reference values after
you have changed the tire pressure. You can,
however, also update the reference values by
restarting the tire pressure monitor manually
(
page 336).
/
System limits
The system may be impaired or may not function
particularly in the following situations:
incorrect reference values were taught in
R
sudden pressure loss caused by a foreign
R
object penetrating the tire, for example
there is a malfunction caused by another radio
R
signal source
▌Checking the tire pressure with the tire pres-
sure monitoring system
Requirements
The vehicle is switched on.
R
Driver's display:
©
Service
4
5
Press a to confirm.
#
Wheels and tires 335
One of the following displays appears:
Current tire pressure of each wheel:
R
Tire pressure displayed after driving for a
R
few
minutes.: current values are not yet
known to the system. The pressure/tempera-
ture values for each tire will be displayed as
soon as they are known to the system.
Tire Pressure Monitor
Active: the teach-in
R
process of the system is not yet complete. The
tire pressures are already being monitored.
Compare the current tire pressure with the
#
recommended tire pressure for the current
operating condition (
page 333). Addition-
/
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