2020 MERCEDES-BENZ GLA spare tire

monitor
warnsyouifthe pressu redrops inone
or more ofthe tires. Thetirepressu remonitor
only functions ifthe correspondi ngsensors
are install edinall whee ls.
Information ontire pressu resisdisp layed in
the multifu nctiondisplay.After afew minutes
of drivi ng,the current tirepressu reofeach tire
is shown inthe Serv. Serv.
menuofthe multifu nc-
tion display,see illustratio n(examp le). For
informatio non the messa gedisp lay,refer
to the "Checking thetire pressu reelectroni-
call y"section (Ypage 314).
Important safetynotes G
WARNING
Each tire,includ ingthe spare (ifprovid ed),
shou ldbe checked atlea stonce every two
weeks whencoldandinflated tothe pres-
sure recommended bythe vehicl emanufa c-
turer onthe Tire andLoad ingInformation
pla card onthe driver' sdoor B-pillaror the
tire pressu relab elon the inside ofthe fuel
fill er flap .If you rvehicl ehas tires ofadiffer-
ent size than thesize indica tedonthe Tire
and Load ingInformation placard or,ifavai la-
ble, thetire pressu relab el,you shou ld
determine theprope rtire pressu refor those
tires.
As anadd edsafety feature ,you rvehicl ehas
been equippe dwith atire pressu remonitor-
ing system (TPMS)thatillumina tesalow tire
pressu retelltal ewhen oneormore ofyou r
tires aresignifi cantly underinflated. Accord-
ingly ,when thelow tirepressu retelltal e
ligh tsup, you shou ldstop andcheck your
tires assoon aspossi ble,and inflate themto
the prope rpressu re.Driving onasignifi -
cantly underinflated tirecause sthe tire to
overhea tand canleadto tire failure. Underinfla
tionalsoredu cesfuel efficie ncy
and tiretread life,and may affect thevehi-
cle's handl ingand stoppi ngability.Plea se
note thattheTPMS isnot asubs titute for
prope rtire maintenance, anditis the driv-
er's responsi bility tomaintai ncorrect tire
pressu re,even ifunderi nflation hasnot
reache dthe level totrigger illumina tionof
the TPMS lowtirepressu retelltal e.
You rvehicl ehas alsobeen equippe dwith a
TPMS malfunction indicatortoindica te
when thesystem isnot opera tingprope rly.
The TPMS malfunction indicatoriscombined
with thelow tirepressu retelltal e.When the
system detects amalfu nction, thewarni ng
lamp willflash forapp roximatel ya minute
and then remai ncontinuousl yillumina ted.
This sequ ence willbe repea tedevery time
the vehicl eis started aslong asthe malfu nc-
tion exists. Whenthemalfu nction indicator
is illumina ted,thesystem maynotbeableto
detect orsignal lowtirepressu reas inten-
ded.
TPMS malfunctions mayoccur foravarie ty
of reaso ns,includ ingthe install ationof
incompati blerepla cement oralterna tetires
or whee lson the vehicl ethat prevent the
TPMS fromfunctioning properly.Alwa ys
check theTPMS malfunction telltaleafter
repla cingoneormore tiresorwhee lson
you rvehicl eto ensure thattherepla cement
or alterna teTires andwhee lsall ow the
TPMS tocontinue tofunction properly.
It is the driver' sresponsi bility toset the tire
pressu reto that recommended forcold tires
which issui table forthe opera tingsitua tion
(Y page 308). Notethatthecorrect tirepres-
sure forthe current operatingsitua tionmust
first betaugh t-intothe tire pressu remonitor.
If asubs tantial lossofpressu reoccurs, the
warni ngthreshol dfor the warni ngmessa geis
ali gned tothe taugh t-inreference values.
Resta rtthe tire pressu remonitor afteradjust-
ing the pressu reofthe cold tires
(Y page 315).The current pressuresare
saved asnew reference values.Asaresul t,a
warni ngmessa gewillapp ear ifthe tire pres-
sure drops significantly. Tire
pressure
313Wheelsand tires Z

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

Rec
omme ndedtire press ures
The reco mmend edtire pressu reappliesto the
tire smou nted atthe facto ry.
The Tireand Loading Inform ation placa rdcon-
tai ns the reco mmend edtire pressu res forcold
tire son aful lyloa ded vehicleand forthe maxi -
mum permis siblevehi clespe ed.
The tirepressu retab lecontai nsthe reco m-
mend edpre ssu res forcoldtire sfor various
ope ratingcondi tions,i.e .di fferi ngloadand
spe edcondi tions.
In cre ase dveh icle we ight due toopti onal
equi pment
The comb inedweigh tof allstand ardand
opti onalequ ipment availab lefor the vehi cle,
reg ard less ofwhe ther itis actu ally insta lled on
the vehi cleornot.
Rim
Thi sis the partof the whe elon whi chthe tire
is mou nted.
GAW R(Gro ssAxleWei ght Ratin g)
The GAW Ris the maxi mum grossaxl ewe igh t
rati ng. The actu alloa don anaxlemus tneve r
excee dthe gros saxl ewe igh trati ng. The gros s
axl ewe igh trati ngcan befou ndonthe vehi cle
id entif ication plate onthe B-pi llar on the driv-
er's side.
Spe edrating
The speedrati ngispa rtof the tire identif ica-
tion. Itspe cifiesthe speedrang efor whi chthe
tire isap pro ved .
GVW (GrossVehi cle Wei ght)
The gros svehi cleweigh tincl udes the weigh t
of the vehi cleincluding fuel,tool s,the spare
whe el,acce ssoriesinsta lled, occu pants, lug-
ga ge and thedrawbarnose weigh t,ifap plica -
bl e. The gros svehi cleweigh tmus tnot excee d
the gros svehi cleweigh trati ngGVW Ras spe ci-
fie don the vehi cleidentif ication plate onthe
B-pi llar on the driver' ssid e.
GVWR (GrossVehi cle Wei ght Ratin g)
The GVW Ris the maxi mum permis siblegros s
we igh tof aful lyloa ded vehicle(the weigh tof
the vehi cleincluding allacce ssories,occu -
pa nts, fuel,lu gga geand thedrawbarnose -
we igh t,ifap plica ble). The gros svehi cleweigh t
rati ngisspe cified on the vehi cleidentif ication
pl ate onthe B-pi llar on the driver' ssid e. Maxi
mum loaded vehicle we ight
The maxi mum weigh tis the sum of:
R the curb weigh tof the vehi cle
R the weigh tof the acce ssories
R the loadlimit
R the weigh tof the facto ryinsta lled opti onal
equ ipment
Ki lopasc al(kP a)
Metri cuni tfor tire pressu re.6.9 kPa corre -
spo nds to1psi .Another unitfor tire pressu re
is ba r.100 kilopa scals(kPa )are the equivalent
of 1ba r.
Lo ad index
In addition tothe load-be aring index, the load
ind exmay also be imp rinte don the sidewallof
the tire.Thi sspe cifiesthe load-be aring cap a-
city more precise ly.
Curb weight
The weigh tof avehi clewith stand ardequip-
ment including the maxi mum capacityof fue l,
oil and coolant. Italso incl udes the air-condi -
tioni ngsystem andoptionalequ ipment ifthes e
are insta lled inthe vehi cle,bu tdoe snot
incl udepa sse ngers orlugga ge.
Maxi mum load rating
The maxi mum tireloadis the maxi mum per-
mis siblewe igh tin kilogra msorlbsfor whi cha
tire isap pro ved .
Maxi mum permis sibl etire press ure
Ma ximu mper mis sibletire pressu refor one
tire .
Maxi mum load on onetire
Ma ximu mloa don one tire.Thi sis cal cul ate d
by divid ing the maxi mum axleloa dof one axle
by two.
PSI (pounds persquare inch)
A stand ardunitof mea sure for tire pressu re.
As pec tratio
Re lations hipbetw eentireheight and tirewidth
in per cent.
Tire press ure
Thi sis pre ssu reinsi dethe tire applying anout-
wa rdforce toeach squ are inch ofthe tire's
su rfa ce. The tirepressu reisspe cified in Al
labo utwh eelsand tires
325Wheelsand tires Z

which
havebeen approv edbyMerc edes-
Ben zspec ifically foryour vehic le.
These tires have been speciallyadapte dfor
use with thecon trol syst ems, suchasABS
or ESP®
,and aremark edasfollo ws:
R MO =Merc edes- BenzOrig inal
R MOE =Merc edes- BenzOrig inalExten ded
(tir es feat uringrun -flat char acterist ics)
R MO1 =Merc edes- BenzOrig inal(onlycer -
tain AMG tires)
Merc edes- BenzOrig inalExten ded tires may
only beused onwheels that have been spe-
cif ically approv edbyMerc edes- Benz.
On lyuse tires, wheels oracc esso riestested
and approv edbyMerc edes- Benz.Cert ain
char acterist ics,e.g.hand ling,vehic lenois e
emiss ionsorfuel consumpt ion,may other-
wise beadver selyaffected. Inaddit ion,
when drivingwith aload, tiredimen sionvar-
iatio nscould cause thetir es tocom eint o
con tactwith thebodywor kand axle compo-
nen ts.This could result indamage tothe
tir es orthevehic le.
Merc edes- Benzacc eptsno liabilit yfor dam-
age result ingfromtheuse oftires, wheels
or acc esso riesotherthan those tested and
approv ed.
In for mat ionontires, wheels andapprov ed
com binat ionscanbeobt ained fromany
qualified specialist workshop.
! Retr
eaded tires are neither tested nor rec-
omm endedbyMerc edes- Benz,sin ce prev i-
ous damage cannot always bedet ectedon
ret readed tires. Asaresult ,Merc edes- Benz
can not guaran teevehic lesafet yif ret readed
tir es are moun ted.Do not moun tused tires
if you have noinform ation about their prev i-
ous usage.
The recomm endedpres sures forvario usoper -
atin gcon ditions canbefoun d:
R on theTire andLoadin gIn for mat ionplacar d
on theB- pillar onthedriv er's side
R in thetir epres sure table inthefuel filler flap
Obser vethenot eson rec omm endedtirepres -
sures under variousoper atingcon ditions
(Y page 308).
Check tirepres sures regular ly,and only when
th etir es are cold .Comply withthemain te-
nan cerec omm endation sof thetir eman ufac-
tur erinthevehic ledoc umen twallet. Not
eson thevehic leequipme nt–always
equip thevehic le:
R with tires ofthesame sizeon agiven axle
(left andright)
R with thesame typeoftire(summ ertires,
MOE xtend edtires, wint ertires)
Ex cept ion:itis perm issible toins tall adiff er-
ent type ormak ein theeven tof aflat tire.
Obser vethe"MOE xtend edtires (tires with
run -flat char acterist ics"section
(Y page 289).
Vehic lesequipped withMOExtend edtires are
not equipped withaTIRE FITkit atthefac tory.
It is theref orerecomm endedthat you addit ion-
ally equip yourvehic lewith aTIRE FITkitifyou
moun ttir es that do not feature run-flat prope r-
ties ,e.g .wint ertires. ATIRE FITkit may be
obt ained fromaqualified specialist workshop. Emer
gency sparewheel Imp
ortant safety notes G
WAR
NING
The wheel ortiresiz eas well asthetir etype
of thespare wheel oremer gencyspare
wheel andthewheel tobe replac edmay dif-
fer .Moun tingan emer gencyspare wheel
may severelyimpair thedriv ingchar acteris-
tic s.Ther eis arisk ofan acc iden t.
To avoid hazardous situation s:
R adapt yourdrivingstyle acc ordin glyand
driv ecar efully.
R nev ermoun tmor eth an one spare wheel
or emer gencyspare wheel that diff ers in
siz e.
R only useaspare wheel oremer gency
spare wheel ofadiff eren tsiz ebrief ly.
R do not swit chESP®
off .
R have aspare wheel oremer gencyspare
wheel ofadiff eren tsiz ereplac edatthe
near estqualified specialist workshop.
Obser vethat thewheel andtiredimen -
sion sas well asthetir etype must becor -
rec t.
When usinganemer gencyspare wheel or
spare wheel ofadiff eren tsiz e,you must not Emer
gency sparewheel
331Wheels andtires Z

exceed
thevehicle's maximum designspeed
of 50 mph (80km/ h).
You should regularly checkthepressure ofthe
emergen cyspare wheel, particularly priorto
long trips, andcorrectthe pressure asneces -
sary (Ypage 308). Thevalue onthe wheel is
valid.
Sno wchains mustnotbemount edon emer-
genc yspare wheels. General
notes
You canaskforinfor mation regarding permit-
ted emergen cyspare wheels atan authorized
Mercedes- BenzCenter .
An emergen cyspare wheel mayalsobemoun-
ted against thedirect ionofrotat ion.Observe
the time restriction onuse aswell asthe
speed limitation specifiedonthe emergen cy
spare wheel.
Replace thetires after sixyears atthe latest,
regardless ofwear. Thisalso applies tothe
emergen cyspare wheel.
Tire pressure losswarning system(Can-
ada only): aslong asyou aredriving withthe
emergen cyspare wheel mounted,the tire
pressure losswarning systemcannotfunc tion
reliably. Onlyrestar tthe tire pressure loss
warning systemwhenthedefect ivewheel has
been replaced withanew wheel.
Vehicles withtirepressure monitor (USA
only): afteranemergen cyspare wheel has
been mount ed,the system maystilldisplay
the tire pressure ofthe removed wheelfora
few minutes .The value displayed forthe
mount edemergen cyspare wheel isnot the
same asthe curren ttire pressure ofthe emer-
genc yspare wheel. Removing
theemergency spare
wheel Vehicles
withthe"Minispare" emergencyspare
wheel
The "Minispare" emergencyspare wheel is
secured inemergen cyspare wheel bag0043in
the cargo compart ment.
X Open thetailgate.
X Release securing straps0044onemergen cy
spare wheel bag0043.
X Remove emergen cyspare wheel bag0043
with the"Minispare" emergencyspare
wheel.
X Open emergen cyspare wheel bag0043and
remove the"Minispare" emergencyspare
wheel.
Observe theinstruct ions andsafety notesin
the "Changing awheel" section(Ypage 327). 332
Emergency
sparewheelWheels andtires