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Vehicle care145
For the tyres approved for your
vehicle, refer to the EEC Certificate of Conformity provided with your vehicle
or other national registration
documents.
The driver is responsible for correct
adjustment of tyre pressures.9 Warning
If the pressure is too low, this can
result in considerable tyre warm-
up and internal damage, leading to tread separation and even to tyre
blow-out at high speeds.
Tyre pressure monitoring
system
The Tyre Pressure Monitoring
System (TPMS) uses radio and
sensor technology to check tyre
pressure levels.
Caution
Tyre pressure monitoring system
warns only about low tyre pressure condition and does not replace
regular tyre maintenance by the
driver.
The TPMS sensors monitor the air pressure in the tyres and transmit tyre
pressure readings to a receiver
located in the vehicle.
All wheels must be equipped with
pressure sensors and the tyres must
have the prescribed pressure.
Tyre pressure chart 3 172.
Notice
In countries where the tyre pressure monitoring system is legally
required, the use of wheels without
pressure sensors will invalidate the
vehicle type approval.
Low tyre pressure condition
A detected low tyre pressure
condition is indicated by illumination
of control indicator w 3 77 together
with a warning chime. In vehicles with Multifunction version of the Driver
Information Centre, a corresponding message is also displayed.
If w illuminates, stop as soon as
possible and inflate the tyres as
recommended 3 172.
After inflating, driving may be
required to update the tyre pressure
values in the system. During this time
w may illuminate.
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146Vehicle care
If w illuminates at lower temperatures
and extinguishes after some driving,
this could be an indicator for getting low pressure. Check tyre pressure.
If the tyre pressure must be reduced
or increased, switch off ignition.
Only mount wheels with pressure
sensors, otherwise the tyre pressure
will not be displayed and w flashes for
several seconds then illuminates
continuously.
A spare wheel or temporary spare
wheel is not equipped with pressure
sensors. TPMS is not operational for
these wheels. For the further three
wheels, TPMS remains operational.
Spare wheel 3 152, Wheel changing
3 150.
Control indicator w and (depending
on version) a corresponding message
appears at each ignition cycle until
the tyres are inflated to the correct
tyre pressure.
Driver Information Centre 3 80.Temperature dependency
Tyre pressure depends on the
temperature of the tyre. During
driving, tyre temperature and
pressure increase. Therefore it is important to check tyre pressure with
cold tyres.
General information The use of commercially available
liquid tyre repair kits can impair the
function of the system. Factory-
approved tyre repair kits can be used.
Tyre repair kit 3 148.
External high-power radio equipment
could disrupt the TPMS.
Each time the tyres are replaced,
TPMS sensors must be dismounted
and serviced by a workshop.
Relearn function After changing wheels, TPMS needs
to recalculate. The relearn process
takes up to 20 minutes of driving with
a minimum speed of 15 mph.
If problems occur during the relearn
process, control indicator w flashes
for several seconds then illuminatescontinuously and (depending on
version) a warning message is
displayed in the Driver Information
Centre.
Tread depth
Check tread depth at regular
intervals.
Tyres should be replaced for safety
reasons at a tread depth of 2-3 mm
(4 mm for winter tyres).
For safety reasons, it is
recommended that the tread depth of the tyres on one axle should not vary
by more than 2 mm.
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Vehicle care147
The legally permissible minimum
tread depth (1.6 mm) has been
reached when the tread has worn
down as far as one of the tread wear
indicators (TWI). Their position is
indicated by markings on the
sidewall.
If there is more wear at the front than
the rear, swap round front wheels and rear wheels periodically. Ensure that
the direction of rotation of the wheels
is the same as before.
Tyres age, even if they are not used.
We recommend tyre replacement
every 6 years.
Changing tyre and wheel
size If tyres of a different size than those
fitted at the factory are used, it may be necessary to reprogramme the
speedometer as well as the nominal
tyre pressure and make other vehicle
modifications.
After converting to a different tyre
size, have the label with tyre
pressures replaced.9 Warning
Use of unsuitable tyres or wheels
may lead to accidents and will
invalidate the vehicle type
approval.
Wheel covers
Wheel covers and tyres that are
factory approved for the respective
vehicle and comply with all of the
relevant wheel and tyre combination requirements must be used.
If the wheel covers and tyres used are
not factory approved, the tyres must
not have a rim protection ridge.
Wheel covers must not impair brake
cooling.
9 Warning
Use of unsuitable tyres or wheel
covers could lead to sudden
pressure loss and thereby
accidents.
Tyre chains
Tyre chains are only permitted on the
front wheels.
Always use fine mesh chains that add no more than 10 mm to the tyre tread
and the inboard sides (including chain lock).
Do not exceed 30 mph when tyre
chains are fitted.
9 Warning
Damage may lead to tyre blowout.
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Notice
The driving characteristics of the repaired tyre are severely affected,therefore have this tyre replaced.
If unusual noise is heard or the
compressor becomes hot, turn
compressor off and allow to cool.
Note the expiry date of the kit. After
this date its sealing capability is no
longer guaranteed. Pay attention to
storage information on sealant
bottle.
Replace the used sealant bottle. Dispose of the bottle as prescribed
by applicable laws.
The compressor and sealant can be used from approx. -20 °C.
Replacing the sealant canister
To replace the sealant canister:
1. Disconnect the compressor air hose.
2. Turn the canister anticlockwise to lift it out.
3. Insert the new canister and turn it clockwise.
4. Connect the compressor air hose to the canister and fit the flexible
filler tube into its allocated space.
Wheel changing Some vehicles are equipped with a
tyre repair kit instead of a spare wheel 3 148.
Make the following preparations and
observe the following information:
■ Park the vehicle on a level, firm and
non-skid surface. The front wheels
must be in the straight-ahead
position.
■ Apply the parking brake and engage first or reverse gear.
■ Remove the spare wheel 3 152.
■ Never change more than one wheel
at once.
■ Use the jack only to change wheels
in case of puncture, not for
seasonal winter or summer tyre
change.
■ The jack is maintenance-free.
■ If the ground on which the vehicle is standing is soft, a solid board
(max. 1 cm thick) should be placed
under the jack.
■ No people or animals may be in the
vehicle when it is jacked-up.
■ Never crawl under a jacked-up vehicle.
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■ Do not start the vehicle when it israised on the jack.
■ Clean wheel nuts and thread with a
clean cloth before mounting the
wheel.9 Warning
Do not grease wheel bolt, wheel
nut and wheel nut cone.
1. Disengage wheel nut caps with a screwdriver and remove. Pull off
the wheel cover using a suitable
tool.
2. Attach wheel wrench securely and loosen each wheel nut by halfa turn.
3. Vehicle jacking points are located
at the front and rear.
4. Set the jack to the necessary height. Position it directly below
the jacking point in a manner that prevents it from slipping.
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152Vehicle care
With the jack correctly aligned,
rotate until wheel is clear of the
ground.
5. Unscrew the wheel nuts. 6. Change the wheel. Spare wheel 3 152.
7. Screw on the wheel nuts.
8. Lower vehicle.
9. Install the wheel wrench ensuring that it locates securely and tighten
each nut in a crosswise
sequence. Tightening torque is
85 Nm (steel wheel) or 120 Nm
(alloy wheel).
10. Align the valve hole in the wheel cover with the tyre valve before
installing.
Install wheel nut caps.
11. Stow the replaced wheel 3 152
and the vehicle tools 3 143.
12. Check the tyre pressure of the installed tyre and the wheel nut
torque as soon as possible.
Have the defective tyre renewed or
repaired as soon as possible.Spare wheel
Some vehicles are equipped with a tyre repair kit 3 148 instead of a spare
wheel.
The spare wheel can be classified as a temporary spare wheel depending
on the size compared to the other
mounted wheels and country
regulations.Caution
The use of a spare wheel that is smaller than the other wheels or in combination with winter tyres
could affect driveability. Have the defective tyre replaced as soon as
possible.Depending on model variant, the
spare wheel is stored beneath the
floor or in the load compartment.
1. Attach the extension bar 2 to the
wheel wrench 1. Vehicle tools
3 143.
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2. Insert the wheel wrench into theaperture in the load compartment
floor.
3. Rotate the wheel wrench to lower the spare wheel to the floor.4. Withdraw spare wheel from beneath the vehicle.
5. Unscrew knob 2 and release
cable attachment 1 from spare
wheel.
6. Change the wheel.
7. Position the replaced wheel at the
rear of the vehicle with the outside of the wheel facing downwards.
8. Pass the retainer 1 through the
hole in the rim, inserting the
locating pin into one of the bolt
holes and secure with knob 2.
9. Insert the wheel wrench into the aperture in the load compartment
floor and rotate to fully raise the
spare wheel.
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154Vehicle care
Have the defective tyre renewed orrepaired as soon as possible.
CNG vehicles Vehicles with CNG; the spare wheel
is located in the load compartment.
1. Unscrew two bolts using the wheel wrench and remove spare
wheel from bracket. Vehicle tools
3 143.
2. Change the wheel.
3. Position the replaced spare wheel
onto the bracket ensuring correct
alignment of the locating pin.
4. Secure spare wheel by tightening two bolts using the wheel wrench.
Have the defective tyre renewed or
repaired as soon as possible.
Directional tyres
Fit directional tyres such that they roll in the direction of travel. The rolling
direction is indicated by a symbol
(e.g. an arrow) on the sidewall.
The following applies to tyres fitted
opposing the rolling direction:
■ Driveability may be affected. Have the defective tyre renewed or
repaired as soon as possible.
■ Drive particularly carefully on wet and snow-covered road surfaces.