Checking The Tire Pressure Electronically - Mercedes-Benz S-Class Operator's Manual

Tire pressure
392
TPMS from functioning properly. Always
check the TPMS malfunction telltale after
replacing one or more tires or wheels on your
vehicle to ensure that the replacement or
alternate Tires and wheels allow the TPMS to
continue to function properly.
It is the driver's responsibility to set the tire
pressure to that recommended for cold tires
which is suitable for the operating situation
( page 387). Note that the correct tire
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pressure for the current operating situation
must first be taught-in to the tire pressure
monitor. If there is a substantial loss of
pressure, the warning threshold for the
warning message is aligned to the reference
values taught-in. Restart the tire pressure
monitor after adjusting the pressure of the
cold tires ( page 393). The current
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pressures are saved as new reference values.
As a result, a warning message will appear if
the tire pressure drops significantly.
The tire pressure monitor does not warn you
of an incorrectly set tire pressure. Observe
the notes on the recommended tire pressure
( page 387).
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The tire pressure monitor is not able to warn
you of a sudden loss of pressure, e.g. if the
tire is penetrated by a foreign object. In the
event of a sudden loss of pressure, bring the
vehicle to a halt by braking carefully. Avoid
abrupt steering maneuvers.
The tire pressure monitor has a yellow
warning lamp in the instrument cluster for
indicating a pressure loss or malfunction.
Whether the warning lamp flashes or lights up
indicates whether a tire pressure is too low or
the tire pressure monitor is malfunctioning:
if the warning lamp is lit continuously, the
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tire pressure on one or more tires is
significantly too low. The tire pressure
monitor is not malfunctioning.
if the warning lamp flashes for around a
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minute and then remains lit constantly, the
tire pressure monitor is malfunctioning.
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In addition to the warning lamp, a
message appears in the multifunction
display.
Further information can be found on
( page 295).
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If the tire pressure monitor is malfunctioning,
it may take more than ten minutes for the tire
pressure warning lamp to inform you of the
malfunction by flashing for approximately one
minute and then remaining lit. When the
malfunction has been rectified, the tire
pressure warning lamp goes out after a few
minutes of driving.
The tire pressure values indicated by the on-
board computer may differ from those
measured at a gas station with a pressure
gauge. The tire pressures shown by the on-
board computer refer to those measured at
sea level. At high altitudes, the tire pressure
values indicated by a pressure gauge are
higher than those shown by the on-board
computer. In this case, do not reduce the tire
pressures.
The operation of the tire pressure monitor can
be affected by interference from radio
transmitting equipment (e.g. radio
headphones, two-way radios) that may be
being operated in or near the vehicle.
Checking the tire pressure
electronically
Make sure that the SmartKey is in position
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2 in the ignition lock (
Use ò on the steering wheel to call up
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the list of menus.
Press the 9 or : button on the
X
steering wheel to select the
menu.
Press the a button.
X
Press the 9 or : button to select
X
Tire Tire Pressure Pressure.
Press the a button.
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The current tire pressure of each tire is
shown in the multifunction display.
page 171).
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