2012 MERCEDES-BENZ M-Class tire pressure

repla
cingoneormore tiresorwhee lson you r
vehicl eto ensure thattherepla cement or
alterna tetires andwhee lsall ow the TPMS to
continue tofunction properly. i
USA
only:
If the tire pressu remonitor is
malfu nctioning, itmay take more than
10 minutes forthe tire pressu rewarni ng
lamp toinform youofthe malfu nction by
flas hing for60seconds andthen remai ning
lit.
When themalfu nction hasbeen rectified ,
the tire pressu rewarni nglamp goesout
after drivingfor afew minutes.
Information ontire pressu resisdisp layed in
the multi function display.After afew minutes
of drivi ng,the current tirepress ureofeach
tire isshow nint he multifunction display. i
The
tirepressure valuesindicated bythe
on-board computer maydiffer fromthose
measured atagas station withapressure
gauge. Thetirepressures shownbythe on-
board computer refertothose measured at
sea level. Athigh altitudes, thetire pressure
values indicated byapressure gaugeare
higher thanthose shown bythe on-board
computer. Inthis case, donot reduce the
tire pressures. i
The
operation ofthe tire pressure monitor
can beaffected byinterfer encefromradio
transmit tingequipment (e.g.radio
headphones, two-wayradios)thatmay be
being operated inor near thevehicle. i
USA
only:
This device complies withPart15ofthe
FCC Rules. Operation issubject tothe
following twocondition s:
1. This device maynotcause interfer ence,
and
2. this device mustaccept anyinterfer ence
received, includinginterferencethatmay
cause undesired operation. Any
unauthorized modificationtothis
device couldvoidtheuser’s authority to
operate theequipment. i
Canada
only:
This device complies withRSS-2 10of
Industry Canada.Operation issubjec tto
the followi ng two cond itions :
1. Thisde vice ma ynot causeinte rferenc e,
and
2. thi sde vice mu stacc eptany inte rference
rece ived,incl uding inte rference thatm ay
caus eunde sired oper ationofthe device.
Any unauthorized modificationtothis
device couldvoidtheuser’s authority to
operate theequipment.
Checking tirepressur eelec tronically X
Make surethattheSmartK eyisin position
2 (Y page 139)inthe ignition lock.
X Press the= or; button onthe
steering wheeltoselect the Serv. menu.
X Press the9 or: button toselect Tire
Pressure .
X Press thea button.
The current tirepressure foreach wheel will
be displa yedinthe multifunction display.
If the vehicle hasbeen parked forlonger than
20 minutes, the Tire
pressure willbe displayed
afterdriving afew minutes message
appearsinthe displa y.
Aft erateach-in period,thetire pressure
monitor automatically recognizesnew wheels
or new sensors. Ifac lear allocat ionofthe tire
press urevalues tothe indiv idual wheels isnot
possible ,the Tire
Pressure Monitor Acti
ve mess
ageisshown instead ofthe tire
press uredisplay. Thetirepress uresare
already beingmonitored. i
If
aspare wheel/ emergencyspare wheel
is moun ted,thesyst emmay continue to
show thetirepress ureofthe wheel thathas
been removedforafew minutes .If this
occ urs, notethat thevalue displayed for
the posit ionwhere thespare tireis 360
Tir
epr essur eWheels and tires

mounted
isnot thesame asthe spare
whee l/emerg encyspare wheel'scurrent
tire pressu re.
Tire pressure monitorwarning
message s If
the tire pressu remonitor detectsa
signifi cantpressu reloss onone ormore tires,
a warni ngmessa geisshow nint he
multifunction display.Aw arning tone also
soun dsand thetir epres sure warninglamp
light sup intheins trumen tcluster .
Eac htir ethat isaffec tedbyasign ificant loss
of press ureishighligh tedwith acolor .
If the Corr
ect Tire Pressure mess
age
appears inthe mult ifunc tiondisplay:
X Check thetirepress ureonallfour wheels
and correctit ifnec essary. i
If
the wheel positionsonthe vehic leare
int erc hang ed,the tirepress uresmaybe
displayed forthe wron gposit ionsfora
shor ttime. Thisisrec tified afterafew
min utes ofdrivin g,and thetirepress ures
are displayed forthe correctpositions.
Restar tingthetire pressur emonitor G
WARNIN
G It
is the driver's responsibility toset the tire
pressure tothe recommen dedcold tire
pressure. Underinflatedtiresaffect theability
to steer orbrake thevehicle. Youmight lose
cont rolover thevehicle.
When yourestart thetire pressure monitor,
all existin gwarning messages aredeleted and
the warning lampsgoout. Themonit oruses
the current lyset tire pressures asthe
referen cevalues formonit oring. Inmost
cases, thetire pressure monitoringsystem
recogn izesthenew referen cevalues
automatically. However,
youcan also define referen ce
values manually asdescribed here:
X Set thetire pressure (Ypage 353)tothe
value recomm endedforthe correspon ding
driving situation onthe Tire andLoading
Infor mation placard onthe driver's side
B-pillar.
Additional tirepressure valuesfordriving
at high speeds orwith heavy loadscanbe
found inthe tire pressure tableonthe
inside ofthe fuel filler flap.
X Make surethatthetire pressure iscorrec t
on allfour wheels.
X Make surethattheSmart Keyisin position
2 in the ignition lock.
X Press the= or; button onthe
steerin gwheel toselect the Serv. menu.
X Press the9 or: button toselect Tire
Pressure .
X Press thea button .
The multifunct iondisplay showsthe
current tirepressure ofthe individual tires
or the Tire
pressure willbe displayed
afterdriving afew minutes message.
X Press the: button .
The Use
Current Pressures asNew Reference
Values message
appearsin
the multifunct iondisplay .
If you wish toconfirm theresta rt:
X Press thea button .
The Tire
Press. Monitor Restarted message
appearsinthe multifunct ion
display .
Aft erdriving forafew minutes, thesystem
check swhether thecurrent tirepressures
are within thespecified range.Thenew tire
pressures arethen accepted asreferen ce
values andmonit ored.
If you wish tocancel theresta rt:
X Press the% button .
The tirepressure valuesstored atthe last
restart willcont inue tobe monit ored. Tir
epr essure
361Wheels and tires Z

Load
ingthevehicle Inst
ruction labels fortires and loads G
WAR
NING Do
not over load thetir es by exc eedin gth e
spec ified loadlimit asindi catedon theTire
and Loadin gIn for mat ionplacar don the
driv er'sdoor B-pillar .Overloa dingthetires
can overhea tthem, possibly causinga
blowou t.Overloading thetires canalso result
in handling orsteering problems, orbrake
failure.
Two instruct ionlabel son your vehicle show
the maximum possibleload.
(1) TheTire andLoading Informationplacard
on the B-pillar onthe driver's side.The
Tire andLoading Informationplacard
shows themaximum permissible number
of occupants andthemaximum
permissible vehicleload.Italso contains
details ofthe tire sizes and
corresponding pressuresfortires
mounted atthe factory.
(2) The vehicle identification plateison the
B-pillar onthe driver's side.Thevehicle
identification plateinforms youofthe
gross vehicle weightrating.Itis made up
of the vehicle weight, allvehicle
occupants, thefuel andthecargo. You
can also findinformation aboutthe
maximum grossaxleweight ratingonthe
front andrear axle.
The maximum grossaxleweight ratingis
the maximum weightthatcanbecarried
by one axle (front orrear axle). Never
exceed themaximum loadorthe
maximum grossaxleweight ratingforthe
front orrear axle. :
B-pillar, driver'sside Maximum
permissible grossvehicle
weig htrat ing i
The
specifications shownonthe Tire and
Loading Informationplacard inthe
illu stration areexamples. Themaximum
permissible grossvehicle weightratingis
vehicle-specific andmay differ fromthatin
the illustration .You can find thevalid
maximum permissible grossvehicle weight
rating foryour vehicle onthe Tire and
Loading Information placard. X
The Tire andLoading Information placard
gives youdetails onmaximum permissible
gross vehicle weightrating::"Thegross
weight ofoccupant sand luggage must
never exceed XXXkilograms orXXX
pounds." 362
Loading
thevehicleWheels and tires

You
should payspec ialattent ion toroad
con dition swhen temperat uresarearound
the free zingpoint .
Merc edes- Benzrecomm endsaminimum tire
tread depth of1
/ 6in
(4 mm) forallfour winter
tires (Ypage 352)tom aint ainnorm aldriv ing
ch arac teris tic sin wint er.Win tertir es can
reduc eth ebrak ingdist anceonsnow cove red
su rfa ces incomp arison tosumme rtires.
St oppin gdist ance,howeve r,is still
con siderably greaterthan when theroad is
not covered withiceorsno w.Take
appropr iatecare when driving.
! Avoid wheelspin .This can lead todamage
to the drive train. Temp
erature G
WARNING The
temperature gradeforthis tireis
established foratire that isproperly inflated
and notoverloaded. Excessive speed,
underinflation, orexcessive loading,either
separately orincombination, cancause
excessive heatbuild-upand possible tire
failure.
The temperature gradesareA(the high est),
B, and C.Theserep resent thetire's
res istanc eto the genera tiono fheat and its
ability todissipate heatwhen testedunder
con trolled conditions onaspecified indoor
laboratory testwheel. Sustain edhigh
temper aturecancause thematerial ofthe tire
to degenerat eand reduce tirelife, and
exc essive temper aturecanlead tosudden
tire failure. Thegrade Ccorresponds toalevel
of performanc ewhich allpassenger cartires
must meet under theFederal MotorVehicle
Safety Standard No.109. Grades Band A
represent higherlevelsofperformanc eon the
laboratory testwheel thantheminimum
required bylaw. Tire
labeling Tire
labeling overview
The following markings areonthe tire in
addition tothe tire name (sales designation)
and themanufacturer 'sname: :
Uniform tireQuality Grading Standard
(Y page 371)
; DOT, TireIdent ification Number
(Y page 370)
= Maximum tireload (Ypage 365)
? Maximum tirepressure (Ypage 356)
A Manufacturer
B Tire material (Ypage 371)
C Tire size designation, load-bearing
capacity andspeed rating(Ypage 368)
D Load index (Ypage 370)
E Tire name i
Tire
data isvehicle-specif icand may
deviate fromthedata inthe example. Tir
elabeling
367Wheels and tires Z

Tire
size des ignati on,load -bea ring
cap acit yand speed ratin g :
Tire width
; Nom inalaspec tratio in%
= Tire code
? Rim diame ter
A Load bearingindex
B Spe edrating i
Tire
datais veh icle-spec ificand may
devi atefrom thedat ain theex ample .
Gener al:depen dingon theman ufacturer's
st and ards ,th esiz eimpr inted inthetir ewall
may notco ntain any letters or may contain
on elet tert hat precedes thesize description.
If there isno letter preceding thesize
description (asshown above): theseare
passenger vehicletiresaccording to
European manufacturing standards.
If "P" precedes thesize description: theseare
passenger vehicletiresaccording toU.S.
manufacturing standards.
If "LT" precedes thesize description: these
are light truck tiresaccording toU.S.
manufacturing standards.
If "T" precedes thesize description: theseare
compact emergency sparewheels athigh tire
pressure, tobe used onlytemporarily inan
emergency.
Tire width: tirewidth :shows thenominal
tire width inmillimeters.
Nominal aspectratio: aspect ratio;isthe
size ratio between thetire height andthetire
width andisshown inpercent .The aspect ratio
iscalculated bydividing thetire width by
the tire height.
Tire code: tirecode =specifies thetire type.
"R" represents radialtires."D"represents
diagonal tires,"B"represents diagonalradial
tires.
Optionally, tireswithamaximum speedof
over 149mph(240 km/h)mayhave "ZR"in
the size description dependingonthe
manufacturer (e.g.245/ 40ZR18).
Rim diamet er:rim diameter ?isthe
diameter ofthe bead seat,notthediameter
of the rim flange. Therimdiameter is
specified ininches (in).
Load bearing index:loadbearing indexA
is anumerical codewhich specifies the
maximum load-bearing capacityofatire. G
WARNING The
tireload rating mustalwaysbe atleast
half ofthe GAWR ofyour vehicle. Otherwise,
sudden tirefailure maybethe result which
could cause anaccident and/orserious injury
to you orothers.
Always replace rimsandtires withrims and
tires having thesame specifications
(designation, manufacturer andtype) as
shown onthe original part. G
WARNING Do
not overload thetires byexceeding the
specified loadlimit asindicated onthe Tire
and Loading Informationplacard onthe
driver's doorB-pillar. Overloading thetires
can overheat them,possibly causinga
blowou t.Overloading thetires canalso result
in handling orsteering problems, orbrake
failure.
Example:
The load bearing index91isequiva lenttoa
maximum loadof1356 lbs(615 kg)that the
tire can carry. Forfurther information onthe
maximum tireload inkilograms andpounds,
see (Ypage 365). 368
Tire
labeli ngWheels and tires

have
been especiall ydeveloped fordriving
on snow.
An electronic speedlimiter prevents your
vehicle fromexceeding aspeed of
130 mph (210 km/h).
The speed ratingoftires mounted atthe
factory maybehigher thanthemaximum
speed thattheelectronic speedlimiter
permits.
Make surethatyour tires have therequired
speed ratingasspecified inthe "Tires"
section (Ypage 375), e.g.ifyou buy new
tires.
Further information aboutreading tiredata
can beobtained fromanyqual ified specialist
workshop, e.g.anauthorized Mercedes-Ben z
Center. Load
index i
Tire
data isvehicle-specific andmay
deviate fromthedata inthe example.
In addition tothe load bearing index,load
index :may beimprinted aftertheletters
that identify speedratingB(Ypage 368)on
the sidewa llof the tire.
R Ifno specification isgiven: notext (asinthe
example above),represents astand ard
lo ad (SL )tir e
R XL orExtra Load:rep resents arei nfor ced
tir e R
Ligh tload: represent sa light loadtire
R C, D, E:represent sa load range that
depends onthe maximum loadthatthetire
can carry atacert ainpressure DOT,
TireIdentification Number(TIN)
U.S. tireregulations prescribethatevery
manufacturer ofnew tires orretreader hasto
imprint aTIN inor on the sidewal lof each tire
produced. The
TINisaunique identificat ionnumber. The
TIN enables thetire manufacturer sto inform
purchasers ofrecalls andother safety-
relevant matters.Itmakes itpossible forthe
purchaser toeasily identify theaffect edtires.
The TINismade upofmanufacturer
identificat ioncode ;,tire size =,tire type
code ?and manufacturin gdate A. i
Tire
data isvehicle-specif icand may
deviate fromthedata inthe example.
DOT (Departm entofTransport ation):tire
symbol :indicates thatthetire complies
with therequirements ofthe U.S. Departm ent
of Transport ation.
Manufa ctureridentification code:
manufacturer identificationcode ;provides
details onthe tire manufacturer .New tires
have acode withtwosymbols. Retreaded
tires have acode withfoursymbols.
Further informationabout retreaded tires
(Y page 350).
Tire size: identifier =describes thetire size. 370
Tir
elabelingWheels and tires

Tire
type code: tiretypecod e? can be
us ed bythe manuf actu rerasacod eto
de scri bespe cificcharacteristics ofthe tire.
Date ofmanuf acture:date ofmanufacture
A provides information abouttheage ofa
tire. Thefirst andsecond positions represent
the week ofmanufacture, startingwith "01"
for the first calendar week.Positions three
and four represent theyear ofmanufacture.
For example, atire that ismarked with
"3208", wasmanufactured inweek 32in
2008. Tire
character istics i
Tire
data isvehicle-specific andmay
deviate fromthedata inthe example.
This information describesthetire cord and
the number oflay ers insidewa ll: and under
the tread ;. Defini
tionofterm sfor tires and
loading Tire
plycomposition andmaterial
used
Describes thenumber ofplies orthe number
of lay ers ofrubber-coated fabricinthe tire
tread andsidewa ll.These aremade ofsteel,
nylon, polyester andother materials. Bar
Metric unitfortire pressure. Thereare
14.5 038pounds persquare inch(psi) to
1b ar; there are100k ilopasc als(kPa) to
1 bar. DOT
(Depar tment ofTransp ortation)
DO Tmark edtires fulfill therequire mentsof
the Unit edStates Depar tment of
Tran sport ation. Nor
maloccupa ntweight
The numb erofocc upant sthe vehic leis
design edtoseat ,mult iplied by68 kilog rams
(15 0lbs). Uniform
TireQualit yGra ding
Sta ndar ds
Au nifo rmstanda rdtogra dethe quality of
tire swi th reg ards totrea dqu ality ,tire trac tion
and temp eraturecha racteri stics. Rating sar e
de term inedby tire manuf actu rersus ing U.S.
gov ernm enttesti ngpro ced ures. The rating s
ar emol dedinto theside wa llof the tire. Rec
omme ndedtire pres sure
The reco mme ndedtire pressu reappliesto
the tiresmou nted atthe factory .
The Tire and Loading Info rma tionp lacard
con tain sthe recomm endedtir epress uresfor
cold tires on afully loaded vehicleand forthe
maxim umperm issible vehiclespeed.
The tirepress uretable contain sthe
rec omm endedtir epress uresforcold tires
under various operatingcon ditio ns,i.e.
diff erin gload andspeed conditio ns. Definition
ofter ms fortires and loading
371Wheels and tires Z

Maximum
loadrating
The maximu mload rating inkilograms or
pounds isthe maximum weightforwhich a
tire isapproved. Maximu
mperm issible tirepressur e
Maximum permissible tirepressure forone
tire. Maximu
mload onone tire
Maximum loadonone tire. This iscalculated
by dividing themaximum axleload ofone axle
by two. PSI
(pounds persquar einch)
As tand arduni tofm easure fortire pressure. Aspect
ratio
Relationship betweentireheight andtire
width inpercen t. Tir
epr essure
This ispressure insidethetire applying an
outward forceto each square inchofthe tire's
surface. Thetirepressure isspecified in
pounds persquare inch(psi), inkilopascal
(kPa) orinbar. Thetirepressure shouldonly
be corr ectedwhen thetires arecold. Tir
epr essure ofcold tires
The tires arecold:
R ifthe vehicle hasbeen parked without
direct sunlight onthe tires foratleast three
hours and
R ifthe vehicle hasnotbeen driven morethan
1 mile (1.6km). Tr
ead
The part ofthe tire that comes intocon tact
with theroad. Bead
The tirebead ensures thatthetire sits
securely onthe wheel. Thereareseveral steel
wires inthe bead topreven tthe tire from
comin gloose fromthewheel rim. Sidewall
The part ofthe tire between thetread andthe
bead. Weight
ofoptional extras
The combin edweight ofthose option alext ras
that weigh morethanthereplaced standard
part andmore than2.3kilograms (5lbs).
These optionalext ras, such ashigh-
perform ancebrakes, levelcontrol, aroof rack
or ahigh-perf ormancebatter y,are not
included inthe curb weight andaccesso ry
weight. TIN
(Tire Identificat ionNum ber)
This isaunique identifierwhich canbeused
by atire manufact urertoident ifytires, for
example foraproduct recall,andthus ident ify
the purchasers. TheTINismade upofthe
manufact urer'sidentitycode, tiresize, tire
type code andthemanufact uringdate. Load
bearing index
The load bearing index(alsoloadindex) isa
code thatcontains themaximum loadbearing
capacity ofatire. Definition
ofter ms fortires and loading
373Wheels and tires Z