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Wheels
Tyre monitoring indicator
Fig. 229 Instrument panel: warning of loss of
ty
r
e pr
essure.
The tyre monitor indicator compares wheel
r
ev
o
lutions and, with this information, the
tread of each wheel using the ABS sensors. If
the rolling circumference of one or more
wheels has changed, the tyre monitoring in-
dicator will indicate this on the instrument
panel through a warning lamp and a warning
to the driver ››› Fig. 229. When only one spe-
cific tyre is affected, its position within the
vehicle will be indicated.
Loss of pressure: Check left
tyre pressure!
Wheel tread change
The wheel tread changes when:
●
Tyre pressure is manually changed
●
Tyre pressure is insufficient
●
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 monitoring indicator or it may not in-
dicate anything under certain circumstances
(e.g. sporty driving, snow-covered or un-
paved roads, or when driving with snow
chains).
Calibrating the tyre monitoring indica-
tor
After changing the tyre pressure or replacing
one or mor
e wheel
s, the ty
re monitoring indi-
cator must be recalibrated. Do the same, for
example, when the front and rear wheels are
swapped.
●
Switch the ignition on.
●
Store the new tyre pressure in the Easy
Connect system
1)
by using the
button and
the
S
ETUP
function button ›
›
›
page 27.
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 the cali-
bration ››› page 307.
Note
●
The tyre monit
oring indicator does not
function when there is a fault in the ESC or
ABS ››› page 177.
●
An erroneous indication may be given when
snow chains are in use because they increase
the tread of the wheel.
1)
In vehicles that are not equipped with the Easy
Connect sy
stem, the switch for adjusting tyre pres-
sure is located in the centre console next to the haz-
ard warning lights.
301
Technical dataAdviceOperationEmergenciesSafety
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