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sure for the tyres has been set on the on-board
computer.
The tyre pressure monitoring system will detect
an incorrect value if, for example:
The vehicle is overloaded or incorrectly loa‐
R
ded
The vehicle is fitted with wheels that have dif‐
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ferent tyre sizes and the specified pressure
on the on-board computer has not been cor‐
rected
An incorrect specified pressure has been set
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on the on-board computer.
You are always responsible for setting the correct
tyre pressure. Always have the correct specified
pressure set on the on-board computer at a quali‐
fied specialist workshop.
If radio transmitting equipment (e.g. cordless
headphones, two-way radios) is operated inside
the vehicle or in the vicinity of the vehicle, this
can interfere with the operation of the tyre pres‐
sure monitoring system.
The tyre pressure values on the on-board com‐
puter may differ from those measured with a tyre
pressure checker. The tyre pressures shown by
the on-board computer refer to those measured
at sea level. At high altitudes, the tyre pressure
values indicated by a pressure gauge will be
higher than those shown by the on-board com‐
puter. In this case, do not reduce the tyre pres‐
sure.
When the tyre temperature differs, different tar‐
get pressures may be shown for the tyres, e.g.
because of exposure to sunlight.
Tyre pressure loss warning system
If the tyre pressure of one or more tyres drops,
the instrument cluster displays the h warning
in a yellow or red event window. A warning tone
will also sound. Each tyre pressure value for
which a loss of pressure has been determined
will be highlighted in red or yellow. When there is
a notable loss of tyre pressure, the tyre pressure
value will be shown in red.
Mounting
When balancing wheels with tyre pressure sen‐
sors only use clip-on and adhesive wheel balance
weights that are recommended by Mercedes-
Benz. Balancing granulate, balancing beads or
balancing gel can damage the tyre pressure sen‐
sor and the tyres.
Wheels and tyres 371
You can recognise wheels with tyre pressure sen‐
sors by a red ring on the tyre valve. Observe the
mounting instructions when changing a tyre.
A tyre dealer, a qualified specialist workshop or a
Mercedes-Benz Service Centre will be able to
provide you with further information.
Storage
The battery of a tyre pressure sensor for check‐
ing the tyre pressure is activated automatically
when it is mounted. The tyre pressure sensor will
then begin to transmit data periodically. The lon‐
ger you store wheels with a tyre pressure sensor
mounted, the shorter the service life of the tyre
pressure sensor battery during road use. There‐
fore, tyre pressure sensors should only be moun‐
ted a short time before the wheel is used.
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