3. "Snow chains"
4. "Snow chains fitted"
The rear-wheel steering is switched on again au‐
tomatically when the permitted maximum speed
for snow chains of 50 km/h, 30 mph, is reached.
Tyre Pressure Monitor
Principle
The Tyre Pressure Monitor monitors the tyre
pressure and issues a warning if the tyre pres‐
sure has dropped.
General
Sensors in the tyre valves measure the tyre infla‐
tion pressure and tyre air temperature.
The system detects the fitted tyres automati‐
cally. The system shows the preset nominal
pressures on the control display and compares
them to the current tyre inflation pressures.
If the vehicle is fitted with tyres which are not lis‐
ted in the tyre inflation pressure information on
the vehicle, for example tyres with special appro‐
val, the system must be actively reset. The cur‐
rent tyre inflation pressures are then accepted as
the nominal pressures.
When operating the system, please also comply
with the information and notes in the chapter on
tyre inflation pressure.
For further information:
Tyre inflation pressure, see page 333.
Safety note
WARNING
The display showing the specified tyre inflation
pressures does not replace the tyre inflation
pressure information on the vehicle. If incorrect
data has been entered into the tyre settings,
the specified tyre inflation pressures will also be
incorrect. As a result, reliable signalling of a loss
of tyre inflation pressure can no longer be guar‐
anteed. There is a risk of injury and material
damage. Make sure that the tyre sizes of the
fitted tyres are displayed correctly and that they
match the specifications on the tyres and in the
tyre inflation pressure information.
Operating requirements
The following requirements must be met for the
system, otherwise reliable message of a tyre
pressure loss is not ensured:
▷ After each tyre or wheel change, the system
has detected the fitted tyres, updated the rel‐
evant information and, after a short journey,
shown it on the control display.
If the system does not detect the tyres auto‐
matically, enter the specifications for the fit‐
ted tyres in the tyre settings.
▷ The Tyre Pressure Monitor only becomes ac‐
tive after driving for several minutes:
▷ After tyre/wheel change.
▷ After a reset, For tyres with special appro‐
val.
▷ After changing the tyre setting.
▷ For tyres with special approval:
▷ After every tyre or wheel change, the sys‐
tem must be reset once the tyre inflation
pressure is correct.
▷ A reset must be carried out after the tyre
inflation pressure has been adjusted to a
new value.
▷ Wheels with wheel electronics.
Tyre settings
General
If the system does not detect the tyres automati‐
cally, the specifications for the fitted tyres can be
entered in the tyre settings.
The tyre sizes of the fitted tyres can be found in
the tyre inflation pressure information on the ve‐
hicle or directly on the tyres.
Seite 343
Wheels and tyres
MOBILITY
343
Online Edition for Part no. 01405A38CB9 - VI/21
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