Mercedes-Benz A-Class Operator's Manual page 299

the low tire pressure telltale illuminates, you
should stop and check your tires as soon as
possible, and in ate them to the proper pres-
sure. Driving on a signi cantly under-in ated
tire causes the tire to overheat and can lead
to tire failure. Under-in ation also reduces fuel
e ciency and tire tread life, and may a ect
the vehicle's handling and stopping ability.
Please note that the TPMS is not a substitute
for proper tire maintenance, and it is the driv-
er's responsibility to maintain correct tire
pressure, even if under-in ation 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 ash for
approximately one minute and then remain
continuously 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 tire pressure and the tire
temperature of the tires installed on the vehicle by
means of a tire pressure sensor.
The tire pressure and the tire temperature appear
in the on-board computer ( page 297).
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If there is a substantial pressure loss or if the tire
temperature is excessive, you will be warned with
display messages ( page 379) or the h
/
warning lamp in the instrument cluster
( page 399).
/
The tire pressure monitoring system is only an aid.
It is the driver's responsibility to set the tire pres-
sure to the recommended cold tire pressure suita-
ble for the operating situation.
In most cases, the tire pressure monitoring sys-
tem will automatically update the new reference
Wheels and tires 297
values a er you have changed the tire pressure.
You can, however, also update the reference val-
ues by restarting the tire pressure monitoring sys-
tem manually ( page 298).
/
System limits Syst em limits
The system may be impaired or may not function
particularly in the following situations:
Incorrect reference values were taught in
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Sudden pressure loss caused by a foreign
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object penetrating the tire, for example
There is a malfunction caused by another
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radio signal source
Chec Checking t king the tir he tire pr e pressur essure wit e with t h the tir he tire pr
monit monitor oring syst ing system em
R R eq equir uirements: ements:
The vehicle is switched on.
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On-board computer:
Service Tires
4 5
One of the following displays appears:
Current tire pressure and tire temperature of
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the individual wheels:
297
e pressure essure