Vehicle care
Caution
261
Tyre deflation detection
system
9 Warning
For specific tyres the
Deflation detection system warns
just about low tyre pressure
condition and does not replace
regular tyre maintenance by the
driver.
The tyre deflation detection system
continually checks the rotation speed
of all four wheels and warns on low
tyre pressure condition once vehicle
is driving. This is achieved by
comparing tyre rolling circumference
with reference values and further
signals.
recommended tyre pressure as
shown in the tyre pressure table
may exceed the maximum tyre
pressure as indicated on the tyre.
Never exceed the maximum tyre
pressure as indicated on the tyre.
In case of a system malfunction, the
control indicators q and R appear
at the same time or a message is
displayed in the Driver Information
Centre. Set correct tyre pressure and
reinitialise system. If the failure
continues to be displayed, contact a
workshop. The system is inoperable
when ABS or ESC has a malfunction
or a temporary spare wheel is used.
Once the road tyre has been refitted,
check the tyre pressure with cold
tyres and initialise the system.
Temperature dependency
If a tyre loses pressure the control
indicator q illuminates, a warning
chime is given and a warning
message is displayed in the Driver
Information Centre.
In this case reduce speed, avoid
sharp cornering and strong braking.
Stop at next safe opportunity and
check tyre pressure.
The tyre pressure depends on the
temperature of the tyre. During
driving, tyre temperature and
pressure increase. Tyre pressure
values provided on the tyre
information label and tyre pressure
chart are valid for cold tyres, which
means at 20 °C.
The pressure increases by nearly
1.5 psi for a 10 °C temperature
increase. This must be considered
when warm tyres are checked.
Control indicator q 3 115.
After adjusting tyre pressure initialise
system to extinguish the control
indicator and restart system.
System initialisation
After tyre pressure correction or
wheel change, the system must be
initialised to learn new circumference
reference values: