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Intelligent Technology220
Tyre inflation pressure-control system*
The tyre inflation pressure-control system compares with the aid of the
ABS sensors the speed and also the rolling circumference of the individual
wheels. If the rolling circumference of a wheel is changed, the warning
light lights up in the dash panel insert ⇒ page 38. The rolling circumfer-
ence of the tyre can change if:
• the tyre inflation pressure is too low,
• the structure of the tyre is damaged,
• the vehicle is loaded on one side,
• the wheels of an axle are loaded heavily (e.g. when towing a trailer or
when driving uphill or downhill),
• snow chains are mounted,
• the temporary spare wheel is mounted,
• one wheel per axle was changed.
Basic setting of tyre inflation pressure-control system
After changing the tyre inflation pressures or after changing one or several
wheels, the button for the tyre inflation pressure-control system must be
pressed long enough until an acknowledegment tone sounds when the
ignition is switched on.
• Inflate all tyres to the specified inflation pressure ⇒ page 264.
• Switch on the ignition.
• Press the button ⇒ fig. 182 long enough, until an acknowledg-
ment tone sounds, which confirms the storage of the basic values. As long
as the button is pressed, the warning light lights up in the instru-
ment .
Warning light lights up
If the tyre inflation pressure of at least one wheel is insufficiently inflated
in comparison to the stored basic value, the warning light ⇒ lights
up.
Warning light flashes
If the warning light flashes, there is a system fault. Have the vehicle
inspected by your nearest specialist garage.
WARNING
• When the warning light lights up, immediately reduce the
speed and avoid sudden steering and brake manoeuvres. Please
stop the vehicle without delay at the nearest possible stop and
inspect the tyres and their inflation pressures.
• The driver is responsible for the correct tyre inflation pressures.
For this reason, the tyre inflation pressures must be checked regu-
larly.
• Under certain circumstances (e.g. sporty style of driving, wintry
or unpaved roads) the warning light can be delayed or does not
light up at all.
Fig. 182 Button for
setting the tyre infla-
tion pressure control
value
s24s
.
book
Page
220
Thursday
,
November
24
,
2005
12:27
PM
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