even if under-inflation has not reached the
level to trigger illumination of the TPMS low tire
pressure telltale.
Your vehicle has also been equipped with a
TPMS malfunction indicator to indicate when
the system is not operating properly. The TPMS
malfunction indicator is combined with the low
tire pressure telltale. When the system detects
a malfunction, the telltale will flash for approx-
imately one minute and then remain continu-
ously illuminated. This sequence will continue
upon subsequent vehicle start-ups as long as
the malfunction exists.
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 checks the pressure and temperature
of the tires mounted on the vehicle with the aid of
a tire pressure sensor.
New tire pressure sensors, e.g. in winter tires, are
automatically taught-in during the first journey on
which they are used.
The tire pressure and the tire temperature are
shown on the instrument cluster display
(
/
page 175).
If there is a significant loss of tire pressure, a
warning is issued:
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via display messages (
/
page 315)
R
via the
h
warning lamp on the instrument
cluster (
/
page 330)
It is the driver's responsibility to set the tire pres-
sure to the recommended cold tire pressure suita-
ble for the operating situation. Set the tire pres-
sure when the tires are cold using a tire pressure
gauge. Note that the correct tire pressure for the
current operating situation must first be taught-in
to the tire pressure monitoring system.
In most cases, the tire pressure monitoring system
will automatically update the reference values after
you have changed the tire pressure. You can, how-
ever, also update the reference values manually by
restarting the tire pressure monitoring system
(
/
page 250).
System limits
The system may be impaired or may not function in
the following situations:
R
if the tire pressure has been set incorrectly
R
if there is a sudden pressure loss caused, for
example, by a foreign object penetrating the
tire
R
if there is a malfunction caused by another
radio signal source
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if there is a change of tire size
Bear in mind the following related topic:
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Notes on tire pressure (
/
page 244)
Checking the tire pressure with the tire pressure
Requirements:
R
The vehicle is switched on.
On-board computer:
4
Service
5
Tires
One of the following displays appears:
R
The current tire pressure and tire temperature
of the individual wheels.
Instrument cluster display (color)
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The current tire pressure for each wheel.
Instrument cluster display (black and white)
R
Tire pressure will be displayed after driving a
few minutes.
: the teach-in process of the sys-
Wheels and tires 249
