2020 MERCEDES-BENZ GLA SUV light

The
tirepressure monitordoes notwarn youof
an incorr ectlysettire pressure. Observethe
not eson the recomm endedtirepressure
(Y page 308).
The tirepressure monitorisnot able towarn
you ofasudden lossofpressure, e.g.ifthe
tire ispenetr atedbyaforeign object.In the
event ofasudden lossofpressure, bringthe
vehicle toahalt bybraking carefully. Avoid
abrupt steeringmovemen ts.
The tirepressure monitorhas ayellow warning
lamp inthe instr ument cluster forindicatin g
pressure lossoramalfunct ion.Whether the
warning lampflashes orlights upindicates
whether atire pressure istoo low orthe tire
pressure monitorismalfunct ioning:
R ifthe warning lampislit cont inuously, the
tire pressure onone ormore tiresissignifi-
cant lytoo low. Thetirepressure monitoris
not malfunct ioning.
R ifthe warning lampflashes foraround a
minute andthen remains litconst antly, the
tire pressure monitorismalfunct ioning.
In addition tothe warning lamp,amessage
appears inthe multifunct iondisplay .Observe
the inform ationondisplay messages
(Y page 224).
It may take uptoten minutes foramalfunc-
tion ofthe tire pressure monitortobe indica-
ted. Amalfunct ionwill beindicated bythe tire
pressure warninglampflashing forapprox-
imately oneminute andthen remaining lit.
When themalfunct ionhas been rectified, the
tire pressure warninglampgoesoutafter a
few minutes ofdriving.
The tirepressure valuesindicated bythe on-
board computer maydiffer fromthose meas-
ured atagas station withapressure gauge.
The tirepressures shownbythe on-board
computer refertothose measured atsea level.
At high altitudes, thetire pressure valuesindi-
cated byapressure gaugearehigher than
those shown bythe on-board computer. Inthis
case, donot reduce thetire pressures.
The operation ofthe tire pressure monitorcan
be affect edbyinter ferenc efrom radio trans-
mitt ingequipment (e.g.radio headphones,
two-way radios)thatmay bebeing operated in
or near thevehicle. Checking
thetire pressur eelectroni-
cally X
Make surethattheSmart Keyisin position
0048 inthe ignition lock(Ypage 125).
X Press 0059or0065 onthe steerin gwheel
to select theServ. Serv.
menu.
X Press the0063 or0064 button toselect
Tire Pressure Tire
Pressure.
X Press the0076 button .
The current tirepressure ofeach tireis
shown inthe multifunct iondisplay .
If the vehicle wasparked forlonger than
20 minutes, theTire pressure willbe Tire
pressure willbe
displayed afterdriving afew minutes displayed
afterdriving afew minutes
message isshown.
Aft erateach- inprocess, thetire pressure
monit orautomatically detectsnew wheels or
new sensors. Aslong asaclear allocation of
the tire pressure valuetothe individual wheels
is not possible, theTire Pressure Monitor Tire
Pressure Monitor
Active Active
message isshown instead ofthe tire
pressure display.The tirepressures are
already beingmonitored.
If an emergenc yspare wheel ismounted, the
system maycontinue toshow thetire pressure
of the wheel thathasbeen removed forafew
minutes. Ifthis occurs, notethat thevalue dis-
played forthe position wherethespare wheel
is fitt ed isnot thesame asthe current tire
pressure ofthe emergenc yspare wheel.
Tire pressur emonitor warning mes-
sages If
the tire pressure monitordetect sa pressure
loss inone ormore tires,awarning message is
shown inthe multifunct iondisplay .The yellow
tire pressure warninglampthenlights up.
R Ifthe Please Correct TirePressure Please
Correct TirePressure
message appearsinthe multifunct iondis-
play, thetire pressure inat least onetireis
too low. Thetirepressure mustbecorrec ted
when theopportunit yarises.
R Ifthe Check TirePressure Check
TirePressure message
appears inthe multifunct iondisplay ,the tire
pressure inone ormore tireshasdropped
significant ly.The tires must becheck ed.
R Ifthe Tire Pressure WarningTire Tire
Pressure WarningTire
Failure Failure
message appears,thetire pressure
in one ormore tireshasdropped suddenly.
The tires must becheck ed. 314
Tir
epr essureWheels andtires

If
"LT" precedes thesize descriptio n:these are
light truck tiresaccording toU.S. manufactur-
ing standards.
If "T" precedes thesize descriptio n:compact
emergency wheelswith high tirepressu rethat
are only desig nedfortemporary useinan
emergency.
Tire width: tirewidth0043 shows thenominal
tire widthinmill imeters.
Aspec tratio: aspectratio 0044isthe size ratio
betwee nthe tire height andtirewidthand is
shown inpercent. Theaspe ctratio iscalcul a-
ted bydivid ingthe tire widthby the tire height.
Tire code :tire code 0087specifie sthe tire type.
"R" represents radialtires; "D"represents
dia gonal tires;"B"represents diagonal radial
tires.
Optional ly,tires withamaximum speedofover
149 mph (240 km/h )may have "ZR"in the
size descriptio n,dependi ngon the manufac-
turer (e.g.245/40 ZR18) .
Rim diameter: rimdiameter 0085isthe diame-
ter ofthe bead seat,notthediameter ofthe
rim flange. Therimdiameter isspecifie din
inches (in).
Load-be aringindex: load-bearing index0083is
a numerical codethatspecifie sthe maximum
load -bearing capacityof atire.
Do not overloa dthe tires byexceeding the
specifie dload limit.The maximum permissible
load canbefound onthe vehicle 'sTire and
Loadi ngInformation placard onthe B-pilla ron
the driver's side(Ypage 317).
Example:
Load-be aringindex 91indicates amaximum
load of1,356 lb(615 kg)that thetires can
bear. Forfurther information onthe maximum
tire load inkilogra msand lbs,see
(Y page 323).
For further information onthe load beari ng
index, see"Loa dindex" (Ypage 323).
Speed rating: speedrating0084specifie sthe
appro vedmaximum speedofthe tire.
i Tire
data isvehicle -specific andmay devi-
ate from thedata inthe example .
Rega rdless ofthe speed rating, always observe
the speed limits.Drive careful lyand adapt
you rdriving styletothe traffic conditions. Summer
tires Index Speed
rating Q up
to100 mph (160 km/h) R up
to106 mph (170 km/h) S up
to112 mph (180 km/h) T up
to118 mph (190 km/h) H up
to130 mph (210 km/h) V up
to149 mph (240 km/h) W up
to168 mph (270 km/h) Y up
to186 mph (300 km/h) ZR...Y up
to186 mph (300 km/h) ZR...(..Y) over
186mph (300 km/h ) ZR over
149mph (240 km/h ) R
Optional ly,tires withamaximum speedof
over 149mph (240 km/h) mayhave "ZR"in
the size descriptio n,dependi ngon the man-
ufacturer (e.g.245/40 ZR18).
The service specifica tionismade upofload -
beari ngindex 0083and speed rating0084.
R Ifthe size descriptio nof you rtire include s
"ZR "and there arenoservice specifica tions,
ask thetire manufacture rin order tofind
out themaximum speed.
If aservice specifica tionisavai lable,the
maximum speedislimi ted according tothe
speed ratinginthe service specifica tion.
Example: 245/40ZR1897Y.Inthis exam-
ple, "97Y"isthe service specifica tion.The
letter "Y"represents thespeed rating. The
maximum speedofthe tire islimi ted to
186 mph (300 km/h).
R The size descriptio nfor alltires withmaxi-
mum speed sof over 186mph (300 km/h)
must include "ZR"and theservice specifica -
tion must begiven inparentheses .Example:
275/40 ZR18 (99 Y).Speed rating"(Y)"
indicates thatthemaximum speedofthe
tire isover 186mph (300 km/h). Askthe
tire manufacture rabou tthe maximum
speed . 322
Al
labout wheelsand tiresWheel sand tires

All-wea
ther tires and wint ertires Inde
x Sp
eed ratin g Q
M+S 1 up
to100mph (160km /h) T
M+S 1 up
to118mph (190km /h) H
M+S 1 up
to130mph (210km /h) V
M+S 1 up
to149mph (240km /h) i
Not
alltires wit hth eM+S markingpro vide
th edriv ingcharac teris tic sof wint ertires. In
addit iontotheM+S marking,wint ertires
also have the004D snowfl ake symb olon the
tir ewall. Tireswit hth is mar kingfulf illthe
req uirem ents of theRubber Manufacturers
As soc iation (RMA )and theRubber Assoc ia-
tio nof Canad a(RAC) regardin gth etir etrac-
tio non snow. They have been especially
dev elope dfor driv ingonsnow.
An elec tron icspee dlimit erpre ven tsyour vehi-
cle from excee dingaspee dof 13 0mph
(21 0km /h).
The spee drat ing oftires moun tedat thefac -
to ry may behigh erthan themax imum speed
th at theelec tron icspee dlimit erper mits.
Mak esure that your tires have thereq uired
spee drat ing ,e.g .when buyingne wtires. The
req uired speedrat ing foryour vehicle can be
foun din the"Tire s"sec tion(Y page 330).
Fur ther inform ationabout readingtiredat a
can beobt aine dfrom any qualif iedspec ialist
work shop.
Load index In
addit iontotheload- bearingindex,load
ind ex0043 may beimpr inted afterthelet ters th
at iden tifyspee drat ing onthesidew allof
th etir e. Spe edrating (Ypage 321).
R Ifno spec ificatio nis give n:no text (as inthe
ex ample above),rep resents ast and ard load
(SL )tir e
R XL orExtra Load :rep resents arein forced
tir e
R Ligh tLoad :rep resents alight loadtire
R C, D, E:rep resents aload rangethat
depen dson themax imum loadthat thetir e
can carryat acer tain pressur e
i Tire
datais veh icle-spec ificand may devi-
ate from thedat ain theex ample .
Ma xim um load ratin g Max
imum tireload 0043isthemax imum permis -
sible weigh tfor whic hth etir eis appr oved.
Do notove rload thetir es by excee dingth e
spec ifiedload limit.The maximum permis sible
load canbefoun don theveh icle'sTire and
Load ingInfor mat ionplac ardontheB- pillar on
th edriv er'sside (Ypage 317).
i The
actual values fortires are vehicle-spe-
cif icand may deviate from thevalues inthe
illust ration .
DOT, TireIdent ification Numb er(TIN ) US
tirereg ulati onsst ipulat eth at eve rytire
man ufactureror ret read ermust imprintaTIN
in or on thesidew allofeach tirepro duce d.
1 Or M+S 004D forwint ertires. All
abou twheels andtires
323Wheels andtires Z

pounds
persquare inch(psi), inkilopascal
(kPa) orinbar. Thetirepressure shouldonly
be corr ectedwhen thetires arecold.
Cold tirepr essure
The tires arecold:
R ifthe vehicle hasbeen parked withthetires
out ofdirect sunlight foratleast three hours
and
R ifthe vehicle hasnotbeen driven further
than 1mile (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 com-
ing loose fromthewheel rim.
Sidewall The part ofthe tire between thetread andthe
bead.
Weight ofoptiona lextr as
The combin edweight ofthose option alext ras
that weigh morethanthereplaced standard
parts andmore than2.3kg(5lbs). These
option alext ras, such ashigh-per formance
brakes, levelcontrol, aroof rack orahigh-per -
form ance battery,are not included inthe curb
weight andtheweight ofthe access ories.
TIN (Tire Identificat ionNum ber)
This isaunique identifierwhich canbeused
by atire manufact urertoident ifytires, for
example foraproduct recall,andthus ident ify
the purchasers .The TINismade upofthe
manufact urer'sidentitycode, tiresize, tire
type code andthemanufac turingdate.
Load bearing index
The load bearing index(alsoloadindex )is a
code thatcontains themaximum loadbearing
capacit yof atire.
Tr action
Tract ionisthe result offric tion between the
tires andtheroad surface. Tr
eadwear indicators
Narrow bars(tread wearbars) thataredistrib-
uted overthetire tread. Ifthe tire tread islevel
with thebars, thewear limitof00CD in(1.6 mm)
has been reached.
Occupant distribut ion
The distribut ionofocc upants inavehicle at
their designat edseatin gposition s.
Tota lload limit
Nomin alload andluggage loadplus68kg
(150 lbs)multiplied bythe number ofseats in
the vehicle. Changing
awheel Flat
tire
The "Breakdown assistance"sect ion
(Y page 288)con tains information andnotes
on how todeal with aflat tire. Informat ionon
driving withMOEx tended tires inthe event ofa
flat tire can befound under "MOEx tended tires
(tires withrun-flatcharact eristics"
(Y page 289). Rota
tingthewheels G
WARN
ING
Rotatin gthe fron tand rear wheels ifthe
wheels ortires have differen tdimension s
may severely impairthedriving charact eris-
tics .The servic ebrake orwheel suspension
compon entsmay alsobedamaged. Thereis
a risk ofan acciden t.
Rotate frontand rear wheels onlyifthe
wheels andtires areofthe same dimen-
sions.
! On
vehicles equipped withatire pressure
monit or,elect ronic compon entsare located
in the wheel.
Tire-m ountin gtools should notbeused near
the valve. Thiscould damage theelect ronic
compon ents.
Only have tireschang edataqualified spe-
cialist worksh op.
Observe theinstruct ions andsafety notesin
the "Changing awheel" section(Ypage 326). 326
Changing
awheelWheels andtires