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Vehicle care175
91=Load index e.g. 91 is
equivalent to 618 kgH=Speed code letter
Speed code letter:
Q=up to 160 km/hS=up to 180 km/hT=up to 190 km/hH=up to 210 km/hV=up to 240 km/hW=up to 270 km/h
Tyre pressure
Check the pressure of cold tyres at
least every 14 days and before any long journey. Do not forget the spare
wheel. This also applies to vehicles
with tyre pressure monitoring.Remove the valve cap key from the
fuel filler flap and use it to unscrew the
valve cap.
On vehicles with tyre pressure
monitoring system, screw the adapter
to the valve.
Tyre pressure 3 206 and on the label
on the inside of the fuel filler flap.
The tyre pressure data refer to cold
tyres. It applies to summer and winter tyres.
Always inflate the spare wheel to the
pressure specified for full load.
The ECO tyre pressure serves to
achieve the smallest amount of fuel
consumption possible. It must not be used with run-flat tyres.
Incorrect tyre pressures will impair
safety, vehicle handling, comfort and
fuel economy and will increase tyre
wear.
Tyre pressures differ depending on
various options. For the correct tyre
pressure value, follow the procedure
below:
1. Identify drive axle and body style.
2. Identify the engine identifier code.
Engine data 3 202.
3. Identify the respective tyre.
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176Vehicle care
The tyre pressure tables show allpossible tyre combinations 3 206.
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 pressure.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
continually checks the pressure of all
four wheels when vehicle speed
exceeds a certain limit.
All wheels must be equipped with
pressure sensors and the tyres must
have the prescribed pressure.
When a low tyre condition is detected,
A illuminates. If A comes on, stop as
soon as possible and inflate the tyres as recommended in this manual. Tyre pressures 3 206.
After inflating the tyres to the
appropriate pressure, A may stay
illuminated. Pressure change will be
recognized as the vehicles is driven.
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.
The current tyre pressures may be
shown in the Info-Display 3 107.
Vehicle messages, tyre pressure 3 102.
Control indicator w 3 91.
If the tyre pressure shall be reduced
or increased, switch off ignition.
w may come on in cool weather when
the vehicle is first started and then
turn off as the vehicle is driven. Thiscould be an early indicator that the air
pressure is getting low and needs to
be inflated to the proper pressure.
A spare or temporary spare wheel is
not equipped with pressure sensors.
The tyre pressure monitoring system
is not operational for these wheels
and w illuminates.
Winter tyres or additional wheel sets
have to be fitted with sensors,
otherwise the system will not work
and w will indicate malfunction by
flashing one minute and then
illuminate continuously.
The use of commercially available
liquid tyre repair kits can impair the
function of the system. Factory-
approved repair kits can be used.
External high-power radio equipment
could disrupt the tyre pressure
monitoring system.
Unsuited rims can impair the
transmission quality of the tyre
pressure monitoring system sensors.
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Vehicle care177
Each time the tyres are replaced, the
tyre pressure monitoring system
sensors have to be dismounted and
serviced. For the screwed sensor
replace the valve core and sealing
ring, for the clipped sensor replace
complete rubber valve stem.
Auto learn function After changing wheels the vehicle
must be stationary for approx.
20 minutes, before the system
recalculates. The following relearn
process takes up to 10 minutes of
driving with a minimum speed of
25 km/h. ---- can be displayed in the
Info-display or pressure values can
swap.
If problems occur during the relearn
process, w will flash and then
illuminate continously.Temperature dependency
Cold tyres decrease the tyre
pressure, warm tyres increase the
tyre pressure. During driving tyre
temperature and pressure increase.
The displayed tyre pressure value
shows the actual tyre pressure.
Therefore it is important to check tyre
pressure with cold tyres.
System initialisation
After a wheel change or tyre pressure
adjustment, the system must be
initialised: inflate the cold tyres to the
prescribed pressure according to the
tyre information label or this
document 3 206. Then switch on
ignition and press and hold the DDS
button for approx. 4 seconds. w
flashes three times.
If the tyre pressure difference
between the left and the right wheel
on one axle is more than 30 kPa, tyre
pressure monitoring system
malfunction will be indicated, as the vehicle starts moving for the first time after initialisation. Adjust the tyre
pressure and repeat initialisation.
Notice
The system needs to be initialised
after tyre pressure change,
otherwise it will not be able to warn
properly.
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).
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178Vehicle care
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.
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 reprogram the
speedometer 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.
Remove the wheel covers if tyre
chains are to be installed.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.
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Vehicle care179
Always use fine mesh chains that addno more than 10 mm to the tyre tread
and the inboard sides (including chain
lock).9 Warning
Damage may lead to tyre blowout.
Tyre chains are permitted on tyres of
size 195/65 R 15, 195/60 R 16,
205/55 R16, 205/50 R 17 and
225/45 R17.
Tyre chains are not permitted on tyres of size 225/40 R 18, 225/40 ZR 18
and 235/35 R 19.
The use of tyre chains is not permitted on the temporary spare wheel.
Tyre repair kit
Minor damage to the tyre tread can be
repaired with the tyre repair kit.
Do not remove foreign bodies from
the tyres.
Tyre damage exceeding 4 mm or that
is near the rim cannot be repaired with the tyre repair kit.
9 Warning
Do not drive faster than 80 km/h.
Do not use for a lengthy period.
Steering and handling may be
affected.
If you have a flat tyre:
Apply parking brake and engage first
gear, reverse gear or P.
The tyre repair kit is in the stowage
compartment in the load
compartment.
Push the locking tabs forward and
remove the cover.
1. Take the sealant bottle and bracket with air hose from the
insert.
2. Detach air hose from bracket and screw onto sealant bottle
connection.
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180Vehicle care
3. Position the sealant bottle on thebracket. Make sure that the bottle
does not fall.
4. Unscrew valve cap from defective
tyre.
5. Screw tyre inflation hose to valve.
6. Screw air hose onto compressor
connection.
7. Open cover of electrical connection from the left and pull
out the plug.
8. Open the rear power outlet and insert plug of tyre repair kit.
To avoid discharging the battery, we recommend running the
engine.
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Vehicle care181
9. Switch on the compressor bypressing the on/off switch. The
tyre is filled with sealant.
10. The compressor pressure gauge briefly indicates up to 6 bar whilstthe sealant bottle is emptying
(approx. 30 seconds). Then the
pressure starts to drop.
11. All of the sealant is pumped into the tyre. Then the tyre is inflated.
12. The prescribed tyre pressure should be obtained within
10 minutes. Tyre pressure
3 206 . When the correct pressure
is obtained, switch off the
compressor by pressing the on/off switch again.
If the prescribed tyre pressure is
not obtained within 10 minutes,
remove the tyre repair kit. Move
the vehicle one tyre rotation.
Reattach the tyre repair kit and
continue the filling procedure for
10 minutes. If the prescribed tyre
pressure is still not obtained, the
tyre is too badly damaged. Seek
the assistance of a workshop.Release excess tyre pressure
using the ] button.
Do not run the compressor longer than 10 minutes.
13. Disconnect plug from power outlet, place in plug compartment
and remove tyre repair kit. Push
catch on bracket to remove
sealant bottle from bracket. Screw
tyre inflation hose to the free
connection of sealant bottle. This
prevents sealant from escaping.
Stow tyre repair kit in load
compartment.
14. Remove any excess sealant using a cloth.
15. Take the label indicating maximum permitted speed from
the sealant bottle and affix in the
driver's field of view.
16. Continue driving immediately so that sealant is evenly distributed
in the tyre. After driving approx.
10 km (but no more than
10 minutes), stop and check tyre
pressure. Screw compressor air
hose directly onto tyre valve and
compressor when doing this.If tyre pressure is more than 1.3 bar , set it to the correct value.
Repeat the procedure until there
is no more loss of pressure.
If the tyre pressure has fallen
below 1.3 bar, the vehicle must
not be used. Seek the assistance
of a workshop.
17. Stow away tyre repair kit in load compartment.
Notice
The driving characteristics of the
repaired tyre is severely affected,
therefore have this tyre replaced.
If unusual noise is heard or the
compressor becomes hot, turn
compressor off for at least 30
minutes.
The built-in safety valve opens at a
pressure of 7 bar.
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.
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182Vehicle care
Replace the used sealant bottle.Dispose of the bottle as prescribed
by applicable laws.
The compressor and sealant can be used from approx. -30 °C.
The adapters supplied can be used
to pump up other items e.g.
footballs, air mattresses, inflatable
dinghies etc. They are located on the underside of the compressor. To
remove, screw on compressor air hose and withdraw adapter.
Wheel changing Some vehicles are equipped with a
tyre repair kit instead of a spare wheel
3 179.
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 gear, reverse gear or
P .
■ Remove the spare wheel 3 184.■ 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.
■ If the ground on which the vehicle is standing is soft, a solid board
(max. 1 cm thick) should be placed
under the jack.
■ Take heavy objects out of the vehicle before jacking up.
■ No people or animals may be in the
vehicle when it is jacked-up.
■ Never crawl under a jacked-up vehicle.
■ Do not start the vehicle when it is raised on the jack.
■ Before screwing in the wheel bolts,
clean them and lightly coat thetaper of each wheel bolt with
commercially available grease.
1. Pull off the wheel cover with the hook. Vehicle tools 3 173.
For wheel covers with visible
wheel bolts: The cover can remain
on the wheel. Do not remove the
retaining rings on the wheel bolts.
Alloy wheels: Disengage wheel
bolt caps with a screwdriver and
remove. To protect the wheel,
place a soft cloth between the
screwdriver and the alloy wheel.