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Vehicle care183The tyre pressure value displayed in
the Info-Display shows the real tyre
pressure. A cooled down tyre will
show a decreased value, which does
not indicate an air leak.
Tyre pressure monitoring system
The tyre pressure monitoring system
checks the pressure of all four wheels
once per minute when vehicle speed
exceeds a certain limit.Caution
Tyre pressure monitoring system
warns only about low tyre pressure
condition and does not replace
regular tyre maintenance by the
driver.
All wheels must be equipped with pressure sensors and the tyres must
have the prescribed pressure. If
wheels without sensors are mounted,
the tyre pressure monitoring system
is not operational.
Note
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 tyre pressure sensors monitor
the air pressure in the tyres and
transmit tyre pressure readings to a
receiver located in the vehicle.
Each tyre, including the spare, should be checked monthly when cold and
inflated to the recommended inflation
pressure 3 212.
Low tyre pressure conditionA detected low tyre pressure
condition is indicated by control
indicator w 3 88.
If w illuminates, stop as soon as
possible and inflate the tyres as
recommended 3 212.
When the system detects a
malfunction, w will flash for approx.
one minute and then remain
continuously illuminated. This
sequence will continue upon
subsequent vehicle start-ups as long as the malfunction exists.
When w is illuminated, the system
may not be able to detect or signal low tyre pressure as intended.
If w illuminates at lower temperatures
and extinguishes after driving, this
could be an indicator for approaching
a low tyre pressure condition. Check
tyre pressure.
Page 186 of 225

184Vehicle careTyre pressures in Info-Display
The current tyre pressures can be
shown in the menu item Tyres in the
Board Computer menu. Press BC on
the Infotainment system and select
the menu item.
The tyre pressure monitoring system
automatically detects the vehicle
load. A corresponding message may appear on the Info-Display if
inconsistent tyre pressures are
detected. In some versions, the
message is displayed in abbreviated
form.
For example, the following messages can be displayed:
A graphic indicating the left rear tyre
is shown together with the current tyre
pressure; slight pressure deviation.
Reduce speed. Check tyre pressure
at next opportunity with an
appropriate gauge and correct if
necessary.
On the Colour-Info-Display, this
message will appear in yellow.A graphic indicating the front left tyre
is shown together with the current tyre
pressure; significant pressure
deviation or direct pressure loss.
Steer out of the flow of traffic as
quickly as possible without
endangering other vehicles. Stop and
check the tyres. Mount the spare
wheel if necessary 3 190.
On the Colour-Info-Display, this
message will appear in red.
Acknowledgement of warnings 3 92,
3 94.
Vehicle messages 3 99.
Page 187 of 225

Vehicle care185If the tyre pressure is to be reduced or
increased, switch off the ignition. Tyre
pressures 3 182, 3 212.
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 3 187.
Operating electronic devices or being close to facilities using similar wave
frequencies could disrupt the tyre
pressure monitoring system.
The tyre pressure monitoring system
valve cores and sealing rings must be
replaced each time the tyres are
changed.
Tyre pressure sensor matching
process
Each tyre pressure sensor has a
unique identification code. The
identification code must be matched
to a new tyre/wheel position after
rotating the tyres or replacing one or
more of the tyre pressure sensors.The tyre pressure sensor matching
process should also be performed
after replacing a spare tyre with a
road tyre containing a tyre pressure
sensor. The control indicator w and
the warning message should
extinguish at the next ignition cycle.
The sensors are matched to the tyre/
wheel positions, using a TPMS
relearn tool, in the following order:
● left front tyre
● right front tyre
● right rear tyre
● left rear tyre
Consult your workshop for service or
to purchase a relearn tool.
There are two minutes to match the
first tyre/wheel position, and
five minutes overall to match all four
tyre/wheel positions. If it takes longer, the matching process stops and must
be restarted.The tyre pressure sensor matching
process is as follows:
1. Apply the electrical parking brake 3 143 ; on vehicles with automatic
transmission move the selector
lever to position P.
2. Turn the ignition on 3 125.
3. Initiate the TPMS Learn Mode by simultaneously pressing p and
q on the radio remote control,
- or -
Press INFO on the Infotainment
system until a tyre learn message appears on the Info-display.
Press and hold OK.
The horn sounds twice and the left front turn signal also illuminates
as confirmation that Learn Mode
has been enabled.
4. Start with the left front tyre. 5. Place the relearn tool against the tyre sidewall, near the valve stem.
Then press the button to activate
the tyre pressure sensor. A horn
chirp confirms that the sensor
identification code has been
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186Vehicle carematched to this tyre and wheel
position. The next relevant turn
signal illuminates.
6. Proceed to the right front tyre, and
repeat the procedure in Step 5.
7. Proceed to the right rear tyre, and
repeat the procedure in Step 5.
8. Proceed to the left rear tyre, and repeat the procedure in Step 5.
The horn sounds twice to indicate
the sensor identification code has been matched, and the tyre
pressure sensor matching
process is no longer active.
9. Turn off the ignition.
10. Set all four tyres to the recommended inflation pressure
3 212.
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.
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. 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.
If wheel rims of a different type are to
be installed, the wheel nuts may also
need to be changed. We recommend you consult a workshop.
Page 189 of 225

Vehicle care187Wheel 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.
They must be fitted to the tyres
symmetrically in order to achieve a
concentric fit.
9 Warning
Damage may lead to tyre blowout.
Special snow chains are only
permitted when they are designed
with a rotating chain belt on the tyre
tread, no chain links on the wheel
inboard sides and the chains add no
more than 12 mm to the tyre tread.
For further information regarding
correct snow chain usage for the tyre
size, contact a specialised vehicle
parts dealer or snow chain
manufacture. Tyre chains are only
permitted on tyres of size
235/60 R17 and 235/55 R18.General
The use of tyre chains is not permitted on the temporary spare wheel.
Tyre repair kit
Minor damage to the tyre tread or
sidewall can be repaired with the tyre
repair kit.
Do not remove foreign bodies from
the tyres.
Tyre damage exceeding 4 mm or that
is at the tyre's sidewall near the rim
cannot be repaired with the tyre repair kit.
In vehicles with a tyre repair kit, there may not be a jack and vehicle tool kit.
Vehicle tools 3 179.
Temporary spare wheel 3 193.
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188Vehicle care9Warning
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 the electrical parking brake
3 143 and engage first gear, reverse
gear or P.
The tyre repair kit is in a storage
compartment below the floor cover in the load compartment.
To remove the tyre repair kit, open the
tailgate.
Pull the floor cover handle upwards
3 68.
Vehicle tools 3 179.
Caution
Do not allow objects to protrude
above the top of the rear floor
storage compartment, to avoid
damage to the storage area and
the load compartment floor.
1. Release the sealant filler hose 1
and the power plug 2.
2. Unscrew valve cap from defective
tyre.
Screw the sealant filler hose onto
the tyre valve.
3. Connect the power plug to the power outlet. Unplug all items
from other power outlets.
4. Switch on ignition. To avoid discharging the battery, werecommend running the engine.5. Turn the selector switch anticlockwise to the sealant +
air position.
Page 191 of 225

Vehicle care1896. Press the on/off button to turn the
tyre repair kit on. The tyre is filled
with sealant.
The pressure gauge briefly shows a high pressure while the sealant
canister is emptying. Then the
pressure starts to drop.
All of the sealant is pumped into
the tyre. Then the tyre is inflated.
7. Inflate the tyre to the recommended inflation pressure
using the pressure gauge. The
prescribed tyre pressure should
be obtained within 10 minutes
3 212 . When the correct pressure
is obtained, switch off the
compressor.
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.Drain excess tyre pressure with
the button next to the pressure
gauge.
Do not run the compressor for
longer than 10 minutes.
8. Detach the tyre repair kit and replace the tyre valve cap.
9. Remove any excess sealant using a cloth.
10. Take the label indicating maximum permitted speed from
the sealant canister and affix in
the driver's field of view.
11. Continue driving immediately so that sealant is evenly distributedin the tyre. After driving approx.
10 km (but no more than
10 minutes) stop and check tyre
pressure.
If the tyre pressure has fallen
slightly, set it to the correct value.
Repeat the procedure until there
is no more loss of pressure.
If the tyre pressure has fallen by more than 68 kPa (0.68 bar), the
vehicle must not be driven. Seek
the assistance of a workshop.
12. To adjust tyre pressure, screw compressor air hose (arrowed)
directly onto tyre valve.
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190Vehicle care
13.Turn the selector switch clockwise
to the air only position. Switch on
the compressor to inflate the tyre
with air only.
Note
The driving characteristic 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.
Note the expiry date of the kit. After
this date its sealing capability is no
longer guaranteed. Pay attention to
storage information on sealant
canister.
Replace the used sealant canister.
To remove sealant canister, release sealant filler hose and air hose, slide
canister out of housing and unscrew hose from canister. Dispose of thecanister as prescribed by applicable
laws.
The accessory adapter supplied can
be used to pump up other items e.g. footballs, air mattresses, inflatable
dinghies etc. The adapter is located
on the underside of the tyre repair kit.
Wheel changing
Some vehicles are equipped with a
tyre repair kit instead of a spare wheel
3 187.
Make the following preparations and
observe the following information:
● Park the vehicle on a level, firm and non-slippery surface. The
front wheels must be in the
straight-ahead position.
● Apply the electrical parking brake
3 143 and engage first gear,
reverse gear or P.
● Remove the spare wheel 3 193.● Never change more than one
wheel at a time.
● Block wheel diagonally opposite the wheel to be changed, by
placing wedge blocks or
equivalent in front and behind the wheel.
● Use the jack only to change wheels in case of puncture, not
for seasonal winter or summer
tyre changes.
● Never exceed jack maximum working load (900 kg).
● If the ground on which the vehicle
is standing is soft, a solid board
(max. 1 cm thick) should be
placed under the jack.
● Do not raise the vehicle more than is necessary to change a
wheel.
● No people or animals may be in the vehicle when it is jacked-up.
● Never crawl under a jacked-up vehicle.