Jump-starting
For the jump-starting procedure, use only the jump-starting connection point in the engine com-
partment,consisting of apositive terminal and aground point.
GWARNING
Battery acid is caustic. There is arisk of injury.
Avoid contact with skin, eyes or clothing. Do not inhale any battery gases. Do not lean over the
battery. Keep children away from batteries. Wash away battery acid immediately with plenty of
clean water and seek medical attention.
GWARNING
During charging and jump-starting, explosive gases can escape from the battery. There is arisk
of an explosion.
Particularly avoid fire, open flames, creating sparks and smoking. Ensure there is sufficient ven-
tilation while charging and jump-starting. Do not lean over abattery.
GWARNING
During the charging process, abattery produces hydrogen gas. If ashort circuit occurs or sparks
are created, the hydrogen gas can ignite. There is arisk of an explosion.
RMake sure that the positive terminal of aconnected battery does not come into contact with
vehicle parts.
RNever place metal objects or tools on abattery.
RIt is important that you observe the described order of the battery terminals when connecting
and disconnecting abattery.
RWhen jump-starting, make sure that the battery poles with identical polarity are connected.
RIt is particularly important to observe the described order when connecting and disconnecting
the jumper cables.
RNever connect or disconnectt he battery terminals while the engine is running.
GWARNING
Ad ischarged battery can freeze at temperatures below freezing point. When jump-starting the
vehicle or charging the battery, gases can escape from the battery. There is arisk of an explosion.
Allow the frozen battery to thaw out before charging it or jump-starting.
!Avoid repeated and lengthy starting attempts. Otherwise, the catalytic converter could be
damaged by the non-combusted fuel.
If the indicator/warning lamps do not light up at low temperatures, it is very likely that the dis-
charged battery has frozen.Int his case, you may neither charge the battery nor jump-start the
vehicle. The service life of athawed-out battery may be shorter. The starting characteristicsc an be
impaired, particularly at low temperatures. Have the thawed-out battery checked at aqualified
specialist workshop.
Jump-starting249
Breakdown assistance
Z
Do not start the vehicleusing arapid charging device. If your vehicle's battery is discharged, the
engine can be jump-started froma nothervehicleorf romas econd battery using jumpe rcables.
Observe the following points:
RThe battery is not accessible in al lvehicles. If the othe rvehicle's battery is not accessible ,jump-
start the vehicl eusing asecond battery or ajump-starting device.
RYo um ayonl yjump-star tthe vehicl ewhent he engine and exhaust system ar ecold.
RDo not start the engine if the battery is frozen. Let the battery thawf irst.
ROnlyjump-star tfromb atteries with a12Vvoltagerating.
ROnlyu sejumpe rcable swhich have asufficient cross-sectio nand insulate dtermina lclamps.
RIf the battery is full ydischarged, leav ethe battery thati sbeing used to jump-star tconnected for
af ew minute sbefor ea ttempting to start. Thi scharge sthe battery slightly.
RMake sure thatt he two vehicles do not touch.
Make sure that:
RThe jumpe rcable sarenot damaged.
RBar eparts of the termina lclamp do not come into contact with othe rmeta lparts whil ethe jumper
cable sareconnected to the battery.
RThe jumpe rcable scanno tcome into contact with parts which can mov ewhent he engine is
running ,suc hast he V-bel tpulle yort he fan.
XSecure the vehicl ebyapplyingthe electri cparkin gb rake.
XShift the transmission to position P.
XMake sure thatt he ignition is switched off .All indicator lamps in the instrument cluster must be
off .W henu sing the SmartKey, tur nthe SmartKeytop osition0in the ignition lock and remove it
(
Ypage 115).
XSwitch off al lelectrical consumers ,e.g.r ea rw indo wd efroster ,lighting, etc.
XOpen the hood.
Positio nnumber Bidentifie sthe charge dbattery of the othe rvehicl eorane quivalen tjump-starting
device.
XSlide cover :of positive terminal ;in the direction of the arrow.
XConnect positive terminal ;on your vehicl etopositive terminal =of donor battery Busing the
jumpe rcable ,alway sbegin with positive terminal ;on your ow nvehicl efirst.
XStar tthe engine of the donor vehicl eand runitati dlingspeed.
250Jump-starting
Breakdow nassistance
Tire and LoadingInfor matio nplacard
:Recommended tire pressures
The Tire and Loading Informatio nplacard is on
the B-pillar on the driver's side (
Ypage 265).
The Tire and Loading Informatio nplacard con-
tains the recommende dtire pressures for cold
tires. The recommende dtire pressures ar evalid
for the maximum permissibl eloa da nd up to the
maximum permissibl evehicl espeed.
Tire pressure table
The tire pressure table is on the insid eofthe fuel
fille rflap. It shows the tire pressure for al ltires
permitted at the factory for thisv ehicle; see
illustratio n(example).
The tire pressure table contains the recommen-
de dp ressures for col dtiresfor various operat-
ing conditions, i.e .differin gloa da nd spee dcon-
ditions.
If at ire size precedes atire pressure, the fol-
lowing tire pressure informatio niso nlyv alid for
thatt ire size; see illustratio n(example).
The load conditions "partiall yladen "and "fully
laden" ar edefine dint he table for different num-
bers of occupants and amounts of luggage.T he
actual numbe rofseats mayd iffer.
Some tire pressure table sshowo nlyt he rim
diameters instea dofthe full tire size, e.g. R18.
Ri md iame terisp artoft he tire size and can be
found on the tire sidewall (
Ypage 269).
If the tire pressures have been set to the lower
values for lighte rloads and/or lowe rroad
speeds ,the pressures shoul dbereset to the
highe rvalues :
Rif youwanttod rive with an increased load
and/or
Rif yo uwanttod rive at highe rroa ds peeds
The tire pressures for increased load sand/or
highe rroa ds peeds, shown in the tire pressure
table ,mayhave anegative effect on driving
comfort.
If the tire pressure is not set correctly, thisc an
lead to an excessive buil dupofheata nd asud-
de nlossofp ressure.
For mor einformation, contact aquali fied spe-
cialist workshop.
Tire pressure259
Wheel sand tires
Z
Important safety notes
GWARNING
Eac htire, includin gthe spar e(if provided),
should be checke datleast once amonth
when cold and inflated to th epressur erec-
ommended by th evehicl emanufacturer on
th eT irea nd Loading Information placard on
th ed river' sdoor B-pillar or th etirep ressur e
label on th einside of th efuel filler flap .Ifyour
vehicl ehas tires of adifferen tsizet hant he
siz eindicated on th eTirea nd Loading Infor -
mation placard or th etirep ressur elabel, you
should determine th eproper tire pressur efor
those tires .
As an added safet yfeature, your vehicl ehas
been equipped wit hatirep ressur emonitoring
system (TPMS) that illuminate salow tire pres-
sur etelltale when on eormoreofy our tires
are significantly underinflated. Accordingly,
when th elow tire pressur etelltale illuminates,
you should stop and chec kyour tires as soo n
as possible ,and inflat ethemtot heproper
pressure. Drivin gonasignificantly underin-
flated tire causes th etiretoo verheat and can
lead to tire failure. Underinflation also
reduce sfuel efficiency and tire tread life ,and
may affec tthe vehicle's handlin gand stop-
pin gability.
Pleas enotet hatthe TPM Sisn otas ubstitut e
for proper tire maintenance ,and it is th edriv-
er' sre
sponsibilit ytom aintai ncorrect tire
pressure, eve nifunderinflation has no t
reached th elevel to trigge rillumination of th e
TPM Slow tire pressur etelltale.
Your vehicl ehas also been equipped wit ha
TPM Smalfunction indicator to indicat eifthe
system is no toperating properly. The TPM S
malfunction indicator is combined wit hthe
low tire pressur etelltale. When th esystem
detects amalfunction ,the warning lamp will
flas hfor approximately aminute and then
remain continuously illuminated. This
sequenc ewill be repeated every time th evehi-
cle is started as lon gasthemalfunction
exists.
When th emalfunction indicator is illuminated,
th es ystem may no tbeable to detec torsignal
low tire pressur easintended. TPM Smalfunc -
tion smay occur for avariet yofr easons,
includin gthe installation of incompatible
replacemen toralternate tires or wheels on
th ev ehicl ethatp reven tthe TPM Sfromf unc-
tioning properly. Always chec kthe TPM Smal-
function telltale after replacing on eormore
tires or wheels on your vehicl etoensuret hat
th er eplacemen toralternate tires and wheels
allow th eTPM Stoc ontinue to function prop-
erly.
It is th edriver' sresponsibilit ytos et th etire
pressur etothatrecommended for cold tires
whic hiss uitable for th eoperating situation
(
Ypage 258). Not etha tthe correc ttirep ressur e
for th ecurren toperating situation must first be
taught-in to th etirep ressur emonitor. If there is
as ubstantial loss of pressure, th ewarning
threshold for th ewarning message is aligned to
th er eferenc evalue staught-in .Restart th etire
pressur emonitor after adjusting th epressur eof
th ec oldt ires (
Ypage 264). The curren tpres-
sures are saved as ne wreferenc evalues. As a
result ,awarning message will appear if th etire
pressur edrops sign ifica
ntly.
The tire pressur emonitor does no twarn you of
an incorrectl yset tire pressure. Observ ethe
note sont herecommended tire pressur e
(
Ypage 258).
The tire pressur emonitor is no table to warn you
of as udde nloss of pressure, e.g. if th etirei s
penetrated by aforeign object. In th eevent of a
sudde nloss of pressure, brin gthe vehicl etoa
halt by braking carefully. Avoid abrup tsteering
movements.
The tire pressur emonitor has ayellow warning
lamp in th einstrumen tcluste rfor indicating
pressur eloss or amalfunction .Whether th e
warning lamp flashes or lights up indicates
whether atirep ressur eistoolow or th etire
pressur emonitor is malfunctioning :
Rif thewarning lamp is lit continuously, th etire
pressur eononeor mor etires is significantly
to ol ow. The tire pressur emonitor is no tmal-
functioning .
Rif thewarning lamp flashes for aroun da
minute and then remain slit constantly, th e
tire pressur emonitor is malfunctioning .
Tire pressure263
Wheels and tires
Z
In addition to the warning lamp,amessage
appears in the multifunction display. Observe
the information on display messages
(
Ypage 196).
It may take up to ten minutes for amalfunction
of the tire pressure monitor to be indicated .A
malfunction wil lbeindicated by the tire pres-
sure warning lamp flashing for approximately
one minute and then remaining lit. When the
malfunction has been rectified, the tire pressure
warning lamp goes out after afew minutes of
driving.
The tire pressure values indicated by the on-
board computer may differ from those meas-
ured at agas station with apressure gauge. The
tire pressures shown by the on-board computer
refer to those measured at sea level.Ath igh
altitudes, the tire pressure values indicated by a
pressure gauge are higher than those shown by the on-board computer. In this case, do not
reduce the tire pressures.
The operation of the tire pressure monitor can
be affected by interference from radi otransmit-
ting equipment (e.g. radi oheadphones, two-way
radios) that may be being operated in or near the vehicle.
Checking the tire pressure electroni-
cally
XMake sure that the SmartKey is in position 2
in the ignition lock (Ypage 115).
XPress the =or; button on the steering
wheel to select the Serv.menu.
XPress the9or: button to select
Tire Pressure.
XPress the abutton.
The current tire pressure of each tire is shown
in the multifunction display.
If the vehicle has been parked for over
20 minutes, the Tire pressure will be
displayed after driving afew minutesmessag eappears.
After ateach-in process, the tire pressure mon-
itor automatically detects new wheelsorn ew
sensors. As long as aclear allocation of the tire
pressure valu etothe individual wheel sisnot
possible, the Tire
PressureMonitorActivedisplay messag eisshown instead of the tire
pressure display. The tire pressures are already
being monitored.
If an emergency spare wheel is mounted, the
system may continue to show the tire pressure of the wheel that has been removed for
afew
minutes. If this occurs, note that the valu edis-
played for the positionw here the spare wheel is
mounted is not the same as the current tire
pressure of the emergency spare wheel.
Tire pressure monitor warning mes-
sages
If the tire pressure monitor detects apressure
loss in one or more tires, awarning messag eis
shown in the multifunction display. The yellow
tire pressure warning lamp then lights up.
RIf the Please Correct Tire Pressuremessag eappears in the multifunction display,
the tire pressure in at least one tire is too low.
The tire pressure must be corrected when the
opportunity arises.
RIf the Check Tiresmessag eappears in the
multifunction display, the tire pressure in at
least one tire has droppeds ignificantly. The
tires must be checked.
RIf the WarningTireMalfunctionmessage
appears in the multifunction display, the tire
pressure in at least one tire has droppeds ud-
denly.T he tires must be checked.
Observe the instructions and safety notes in the
display messages in the "Tires" section
(
Ypage 196).
If the wheel positions on the vehicle are rotated,
the tire pressures may be displaye dfor the
wrong positions for ashort time. This is rectified
after afew minutes of driving, and the tire pres-
sures are displaye dfor the correct positions.
Restarting the tire pressure monitor
When you restart the tire pressure monitor, all
existing warning messages are deleted and the
warning lamp sgoout. The monitor uses the cur-
rently set tire pressures as the reference values for monitoring. In most cases, the tire pressure
monitor wil lautomatically detect the new refer-
ence values after you have changed the tire
pressure. However, you can also define refer-
ence values manually as describedh ere. The tire
pressure monitor then monitors the new tire
pressure values.
XSet the tire pressure to the valu erecommen-
ded for the corresponding driving situation on
the Tire and Loading Information placard on
the driver's side B-pillar(
Ypage 258).
264Tire pressure
Wheelsa nd tires
Tire labeling
Overview
:Unifor mTireQ ualit yGradin gStandard
(Ypage 272)
;DOT, Tire Identification Number
(Ypage 271)
=Maximum tire load (Ypage 271)
?Maximum tire pressure (Ypage 261)
AManufacturer
BTire material (Ypage 272)
CTire size designation, load-bearing capacity
and spee drating (Ypage 269)
DLoa dindex (Ypage 271)
ETire name
The markings describe dabove ar eont he tire in
additio ntothe tire nam e(sales designation) and
the manufacturer's name.
iTire data is vehicle-specific and mayd eviate
fromt he data in the example.
Tire size designation ,loa d-bearing
capacity and speed rating
GWARNING
Exceeding the stated tire load-bearing capa-
city and the approved maximum spee dcould
lead to tire damage or the tire bursting. There is ar iskofa ccident.
Therefore ,onlyu setire types and sizes
approved for your vehicl emodel .Observe the
tire load rating and spee drating required for
your vehicle.
:Tire width
;Nomina laspec tratio in %
=Tire code
?Rimd iame ter
ALoadbeari ng index
BSpeed rating
General: depending on the manufacturer's
standards ,the size imprinted in the tire wall may
not contain any letters or mayc ontain one letter
thatp recedes the size description.
If there is no letter preceding the size descrip-
tio n(as shown above): these ar epassenger
vehicl etiresa ccording to Europea nmanufac-
turing standards.
If "P "precedes the size description: these are
passenge rvehicl etiresa ccording to U.S. man-
ufacturin gstandards.
If "LT" precedes the size description: these are
light truck tire saccording to U.S. manufacturing
standards.
If "T "precedes the size description: compact
emergency wheels with high tire pressure that
ar eo nlyd esig nedf or temporary us einanemer-
gency.
Tire width: tire width:shows the nominal tire
width in millimeters.
Height-width ratio: aspect ratio;is the size
ratio between the tire height and tire width and
is shown in percent. The aspect ratio is calcula-
ted by dividing the tire width by the tire height.
Tire code: tire code=specifie sthe tire type.
"R "r epresents radial tires; "D" represents diag-
ona ltire s; "
B" represents diagona
lradial tires.
Optionally ,tire sw itham aximum spee dofover
149 mph (24 0km/h )mayhave "ZR" in the size
Alla bout wheels an dtires269
Wheel sand tires
Z
An electronic speed limiterprevents your vehi-
cle from exceeding aspeed of 130 mph
(21 0km/h).
The speed rating of tire smounted at the factory
maybeh ighe rthant he maximu mspeed thatt he
electronic speed limite rpermits.
Make sure thaty ourtire sh avet he required
speed rating ,e.g.w henb uyin gnew tires. The
required speed rating for your vehicl ecan be
found in the "tires "sectio n(
Ypage 278).
Further informatio nabout reading tire data can
be obtained from any qualified specialist work-
shop.
Load index
In additio ntothe load-bearing index, load
index :maya lsobei mprinte donthe sidewall
of the tire .You will find thisa fterthe letter that
identifie sthe speed rating (
Ypage 269).
RIf no specification is given: no text (a sinthe
exampl eabove), represents astandard load
(SL) tire
RXL or Extra Load: represents areinforced tire
RLight Load: represents alight load tire
RC, D, E: represents aloa dr ange thatd epends
on the maximu mloadt hatt he tire can carry at
ac ertain pressure
iTire data is vehicle-specific and mayd eviate
from the data in the example.
Maximum load rating
Maximu mtire load :is the maximu mpermis-
sibl ew eigh tfor which the tire is approved.
Do not overload the tire sbyexceeding the
specified load limit. The maximu mpermissible
load can be found on the vehicle's Tire and
Loading Informatio nplacard on the B-pillar on
the driver's side (
Ypage 265).
iThe actual values for tire sarevehicle-spe-
cifi cand mayd eviate from the values in the
illustration.
DOT, Tire Identificatio nNumbe r(TIN)
US tire regulations stipulate thate very tire man-
ufacturer or retreader must imprint aTIN in or on
the sidewall of each tire produced.
The TIN is auniqu eide ntificatio nnumber. The
TIN enables the tire manufacturer sorretreaders
to inform purchaser sofrecallsand othe rsafety-
relevant matters .Itmakes it possibl efor the
purchaser to easily identify the affecte dtires.
The TIN is made up of manufacturer identifica-
tio nc ode ;,t ire size =,tire typ ecode ?and
manufacturing date A.
DO T(De partment of Transportation): tire
symbol :marks thatt he tire complies with the
Alla bout wheels and tires271
Wheel sand tires
Z
Speed rating
The speed rating is part of the tire identification.It specifies the speed range for which the tire is
approved.
GVW (Gross Vehicle Weight)
The gross vehicle weight includes the weight of the vehicle including fuel, tools, the spare wheel,
accessories installed, occupants, luggage and
the drawbar noseweight, if applicable. The gross
vehicle weight must not exceed the gross vehi-
cle weight rating GVWR as specified on the vehi- cle identification plate on the B-pillar on the
driver's side.
GVWR (Gross Vehicle Weight Rating)
The GVWR is the maximum permissible gross
weight of afully loaded vehicle (the weight of the
vehicle including all accessories, occupants,
fuel, luggage and the drawbar noseweight, if
applicable). The gross vehicle weight rating is
specified on the vehicle identification plate on
the B-pillar on the driver's side.
Maximu mloaded vehicle weight
The maximum weight is the sum of:
Rthe curb weight of the vehicle
Rthe weight of the accessories
Rthe load limit
Rthe weight of the factory installed optional
equipment
Kilopascal (kPa)
Metric unit for tire pressure. 6.9 kPa corre-
sponds to 1psi. Another unit for tire pressure is
bar. 100 kilopascals (kPa) are the equivalent of
1b ar.
Load index
In addition to the load-bearing index, the load
index may also be imprinted on the sidewallo f
the tire. This specifies the load-bearing capacity
more precisely.
Curb weight
The weight of avehicle with standard equipment
including the maximum capacity of fuel, oil and
coolant. It also includes the air-conditioning sys-
tem and optional equipment if these are instal-
led in the vehicle, but does not include passen-
gers or luggage.
Maximu mload rating
The maximum load rating is the maximum per-
missible weight in kilograms or lbs for which a
tire is approved.
Maximu mpermissible tire pressure
Maximum permissible tire pressure for one tire.
Maximu mload on one tire
Maximum load on one tire. This is calculated by
dividing the maximum axle load of one axle by
two.
PSI (pounds per squarei nch)
Astandard unit of measure for tire pressure.
Aspect ratio
Relationship between tire height and tire width
in percent.
Tire pressure
This is pressure inside the tire applying an out-
ward force to each square inch of the tire's sur-
face. The tire pressure is specified in pounds per
square inch (psi), in kilopascal (kPa) or in bar.
The tire pressure should only be corrected when the tires are cold.
Cold tire pressure
The tires are cold:
Rif the vehicle has been parked with the tires
out of direct sunlight for at least three hours
and
Rif the vehicle has not been driven further than
1m ile (1.6 km)
Tread
The part of the tire that comes into contact with
the road.
Bead
The tire bead ensures that the tire sits securely
on the wheel. There are several steel wires in the
bead to prevent the tire from coming loose from
the wheel rim.
Sidewall
The part of the tire between the tread and the
bead.
All about wheelsa nd tires273
Wheels and tires
Z