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Wheels and Tires
A
start-ups as long as the malfunction exists. When
the malfunction indicator is illuminated, the system
B
may not be able to detect or signal low tire pressure
as intended. TPMS malfunctions may occur for a
C
varie-ty of reasons, including the installation of
D
replace-ment or alternate tires or wheels on the
vehicle that prevent the TPMS from functioning
E
properly. Always check the TPMS malfunction light
F
indicator after re-placing one or more tires or
wheels on your vehicle to ensure that the
G
replacement or alternate tires and wheels allow the
H
TPMS to continue to function properly.
Monitoring is interrupted in the following cases:
I
– If the Tire Pressure Monitoring System is faulty
J
– If wheel sensors for the Tire Pressure Monitoring
System are missing
K
– In the learning phase after the tire settings have
L
been updated
M
– After a wheel change without updating the tire
settings
N
– If the tire temperatures are too high
O
> Please see chapter "Warning and Information
Messages" on page 293.
P
Q
Retrieving the tire pressure
The individual tire pressures are only displayed
R
above a speed of approx 16 mph (25 km/h) or if the
S
tire is filled to at least 1.5 psi (0.1 bar). When the
ignition is switched on after the vehicle has been
T
stationary for more than approx. 10 minutes, lines
U
(-.-) are shown in place of the tire pressures.
V
e Tire pressure e Current
W
The actual pressures are displayed for information
purposes only. The tire pressures change according
X
to the temperature.
e Never change the tire pressures on the basis of
Y
this display.
Z
318
Displaying pressure difference
Fig. 237: Example pressure difference
b b Vehicle is stationary.
e Tire pressure e Deviation
The pressure difference from the set pressure on the
relevant wheel is displayed. Example:
If the reading for the right rear tire is shown as
–0.1 bar, this tire needs to be inflated by
1.4 psi (0.1 bar). The tire temperature has already
been taken into account in the pressures shown.
e You should only use the pressure difference from
the display or the corresponding tire pressure
warning to correct the tire pressure.
Tire settings
Settings for the tire type and tire size, load and
comfort/standard pressure can be made via the
touch display in the dashboard:
> Please see chapter "Setting Tire Pressure Moni-
toring (TPM)" on page 318.
Setting Tire Pressure Monitoring
(TPM)
Incorrect settings
WARNING
Tire pressure that is too low or too high destroys the
tire and wheel, extends the braking distance and
significantly increases the risk of an accident.
Although the Tire Pressure Monitoring System is
available, it is the driver's responsibility to ensure
that the tires are inflated to the correct tire pressure
and that the vehicle settings are correct. Incomplete
or incorrect settings can affect the output of warn-
ings and notices.
e Adjust tire pressure to suit your tires and the
load.
e Ensure that the settings in the TPMS menu cor-
respond to the tires fitted on the vehicle and the
current load of the vehicle (especially after a
wheel change or changes in vehicle loading).
e Select tire type and size in the Tire Pressure
Monitoring menu again, even if a newly mounted
wheel set corresponds to the settings of the
predecessor.
Displaying pressure difference
b b Vehicle is stationary.
e CAR
e CONTROL
e Vehicle settings e
Tire pressure monitoring e Tire pressure
The required pressure, the pressure difference from
the required pressure at the relevant wheel as well
as the setting for load, tire type and size are
displayed.
Example: If the reading for the right rear tire is
shown as –0.1 bar, this tire needs to be inflated by
1.4 psi (0.1 bar). The tire temperature has already
been taken into account in the pressures shown.
e You should only use the pressure difference from
the display or the corresponding tire pressure
warning to correct the tire pressure.
In the case of tires that have not yet been taught-in,
the new target pressures are displayed instead of
the actual pressure differences.
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