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Wheels
switched on while the function is verified.
They will s
wit
ch off after a few seconds.
WARNING
Observe the safety warnings
››
›
in Con-
trol and w
arning lamps on page 90.
Tyre pressure monitor system
Fig. 232
Instrument panel: warning of loss of
t
yr
e pressure.
The tyre pressure monitoring system com-
par
es the individual speeds of each wheel
and thus the dynamic r
adius with the help of
the ABS sensors.
If the rolling circumference of one or more
wheels has changed, the tyre pressure moni-
toring indicator will indicate this on the instru-
ment panel through a warning lamp and a
warning to the driver
›››
Fig. 232. When only
one specific tyre is affected, its position within
the vehicle will be indicated.
Loss of pressure: Check left
tyre pressure!
Wheel tread change
The wheel diameter changes when:
●
Tyre pressure is changed manually.
●
Tyre pressure is insufficient.
●
The tyre structure is damaged.
●
The vehicle is unbalanced because of a
load.
●
The wheels on an axle are subject to a
heavier load (e.g. with a heavy load).
●
The vehicle is fitted with snow chains.
●
The temporary spare wheel is fitted.
●
The wheel on one axle is changed.
There may be a delay in the reaction of the
tyre pressure monitoring indicator or it may
not indicate anything under certain circum-
stances (e.g. sporty driving, snow-covered or
unpaved roads, or when driving with snow
chains).
Calibrate the tyre pressure monitoring in-
dicator
After changing the tyre pressure or replacing
one or more wheels, the tyre pressure moni-
toring indicator must be recalibrated. Do the
same, for example, when the front and rear
wheels are swapped.
●
Switch the ignition on.
●
Save the new inflation pressure in the Info-
tainment system: function button > SET-
TINGS > Tyres
›››
page 95.
When driving, the system self-calibrates the
tyre pressure provided by the driver and the
wheels fitted. After a long journey with varied
speeds the programmed values are collected
and monitored.
With the wheels under very heavy loads, the
tyre pressure must be increased to the total
recommended tyre pressure before calibra-
tion
›››
Fig. 229.
WARNING
When the tyres are inflated at different
pressur
es or at a pressure that is too low
then a tyre may be damaged resulting in a
loss of control of the vehicle and a serious
or fatal accident.
●
If the lamp lights up, reduce speed im-
mediately and avoid any sudden turning or
braking manoeuvre. Stop when possible,
and check the tyre pressure and status.
●
The tyre pressure monitoring system can
only operate correctly if all of the tyres are
inflated to the correct pressure when cold.
●
If a tyre has not been punctured and it
does not have to be changed immediately,
»
333
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