MERCEDES-BENZ A CLASS 2023 Owners Manual

#
Vehicles withan aut omati ctransmi ssionmust
no tbe tow- star ted. ElectrElectr
icalfuses ical
fuses NNo o
t t
es on electr es
on electr icalfuses ical
fuses &
W W
ARNIN G ARNIN
GRisk ofaccident andinjurydue
to ove rloaded lines
If yo umanipulat eor bridg eafa ulty fuse orif
yo ure place itwit hafuse withahigher amper -
ag e, theelectr icline could beove rloaded.
This could result ina/r e. #
Alwaysre place faulty fuses withspeci-
/ed newfuses containing thecor rect
am per age. *
N NO O
TE TE
Damag edue toincor rect fuse s Electr
icalcom pone ntsorsystems maybe
damag edbyincor rect fuse s,or their function -
ality maybe sign i/can tly im pair ed. #
Onlyuse fuses that have been approved
by Mer cedes-Be nzand which ha ve the
cor rect fuse rating. Blo
wn fuses mustbereplaced withfuses ofthe
same rating, whichyoucan recogn izebythecolor
and thelabel. Thefuse ratings andfurther infor-
mation tobe obser vedcan befound inthefuse
assignment diagram.
F F
use assignmen tdiag r use
assignmen tdiag ram: am:
onthefuse boxin the
engine compartment (/page289).
* NO NO
TE TE
Damag eor malfunctions causedby
moist ure Mois
turema ycause damag eto theelectr ical
sy stem orcause itto malfun ction. #
When thefuse boxis open, makesur e
th at no mois turecan enterthefuse box. #
When closing thefuse box,mak esur e
th at theseal ofthelid ispositioned cor-
re ctl yon thefuse box. If
th ene wly inser tedfuse alsoblows,ha ve the
cause traced andrecti/ed ataqu ali/ed special ist
wo rkshop.
Ensur eth efo llo wing beforere placing afuse:
R The vehicle issecur edagains tro lling away.
R Allelec trica lcons umersareswitc hedo..
R The vehicle isswitc hedo..
The elect rical fuse sar elocat edinvarious fuse
bo xes:
R Fuse boxin theengine compartment onthe
leT-h andside oftheve hicle, when viewe din
th edir ection oftrav el (/ page289)
R Fuse boxin thefront passeng erfoot we ll
(/ page290)
R Fuse boxin thecent erofthetrunk
(/ page291) Opening
andclosing t Opening
andclosing the fuse bo he
fuse boxin t x
in the engine he
engine
com com
par par
tment tment
RR
eq eq
uir uir
ements: ements:
R Adr yclo thand ascr ewdriver areav ailabl e. Br
eakdo wnassis tance
289 289

Obser
vetheno teson elect rical fuse s
(/ page289).
Openi ng Openi
ng &
W W
AR NIN G AR
NIN GRisk ofinjuryfrom using the
wind shield wiperswhen thehood isopen
If th ewindshield wipersst ar tmo ving when the
hood isopen ,yo ucould betrapped bythe
wiper linkage . #
Alwaysswitc ho. thewindshield wipers
and vehicle beforeopen ingthehood. #
Open thehood. #
Remo veanyex istin gmoistur efrom thefuse
bo xusing adr yclo th. #
Loosen screws1. #
Press clam ps2 and liTthefuse boxlid up
and out.
The fuse assignment diagram isin are cess onthe
side ofthefuse box. Closing Closing
#
Chec kwhe ther theseal ispositioned correctl y
in thelid. #
Place thelid on thefuse box. #
Mak esur eth at clam ps2 engage. #
Tight enscrews 1. #
Close thehood. Opening
andclosing t Opening
andclosing the fuse bo he
fuse boxin t x
in the fr he
front ont
passeng passeng
erf er
foo oo
tw tw
ell ell
Obser
vetheno teson elect rical fuse s
(/ page289). 290290
Br
eakdo wnassist ance

Openin
g Openin
g #
LiT carpet1 inthedir ection ofthear ro w. #
Loosen screws2 and remo vethefuse box
lid from theto p.
Closing Closing
#
Place thelid on thefuse box. #
Tight enscrews 2. #
Foldbac kth ecar pet. Opening
andclosing t Opening
andclosing the fuse bo he
fuse boxin t x
in the tr he
trunk unk
Obser
vetheno teson elect rical fuse s
(/ page289). #
Open thetrunk 0oor . Fu
se box1 islocat edinthecent erunder neath
th etrunk 0oor . Br
eakdo wnassist ance
291 291

NN
o o
t t
es on noise orunusual handling c es
on noise orunusual handling char har
act act
er er
is- is-
tics tics
Mak esur eth er ear eno vibr ations, noisesor
unusual handling charact eristics when theve hicle
is in mo tion .This mayind icat eth at thewheels or
tir es aredamag ed.Hidden tiredamag ecould also
be causing theunusual handling charact eristics.
If yo ususpec tth at atir eis malf unct ioning,re duce
yo ur speed immediat elyand have thetir es and
wheels checkedat aqu ali/ed special istwo rkshop. NNo o
t t
es on r es
on regu larl egu
larly insp ectingwheels andtir y
insp ectingwheels andtires es
&
W W
AR NIN G AR
NIN GRisk ofinjuryth ro ugh damag ed
tir es
Damag edtires can cause tirepr essur eloss. #
Chec kth etir es regula rly fo rsigns of
damag eand replace anydamag edtires
immediat ely. &
W W
ARNI NG ARNI
NGRisk ofhydroplaning dueto
insu1c ienttiretread
Ins u1cient tiretread willresult inreduced tire
gr ip.
In hea vyrain or slush therisk ofhydroplaning
is incr eased, inpar ticular wherespeed isno t
adap tedto suit theconditions. #
Thus, youshould regula rly ch eckth e
tr ead depthand thecondition ofthe
tr ead across theentir ewidt hof all tires.
Minimum tread depthfor:
R Sum mertir es :00CE in(3 mm )
R M+S tires :00CFin (4mm ) #
Forsaf etyre asons, replace thetir es
bef oreth eleg ally-pr escr ibed limitforth e
minimum tread depthisreac hed. Car
ryout thefo llo wing checks on allwheels regu-
lar ly,at leas tonce amonth oras requ ired ,fo r
ex am ple, prior toalon gjou rney ordrivin go.-
ro ad:
R Chec kth etir epr essur e(/ page293). R
Visuall yinsp ectwheels andtires fordamag e.
R Chec kth eva lve caps.
R Visual checkof thetir etread depthand the
tir econt actsurface acr oss theentir ewidt h.
The minimum tread depthforsummer tires is
00CE in(3 mm) andforwint ertires 00CF in(4 mm). Six
mar ks1 showwher eth ebar indicat ors
(ar row) areint egratedint oth etir etread. Theyar e
visible onceatir etread depthofappr oximat ely
00CD in(1.6 mm) hasbeen reac hed. 292292
Wheel
sand tires

NN
o o
t t
es on sno es
on sno wc w
chains hains
&
W W
ARNIN G ARNIN
GRisk ofaccident duetoincor -
re ctl yins talled snowch ains
If yo uha ve inst alled snowch ains tothere ar
wheels, they ma ydr ag agains tth eve hicle
body orchassis components. #
Neverinst allsno wch ains onthere ar
wheels. #
Onlyins tallsno wch ains onthefront
wheels inpair s. *
N NO O
TE TE
Damag eto vehicle body orsuspen -
sion compone ntscaused byinst alled
sno wch ains On
4MA TICvehicles, ifyo uinst allsno wch ains
on there ar wheels, youcan damag eve hicle
body orsuspen sioncompone nts. #
On4MA TICvehicles, onlyins tallsno w
ch ains onthefront wheels. *
N NO O
TE TE
Damag eto thewheel trim from
mount edsno wch ains If
sno wch ains aremoun tedto stee lwh eels,
th ewheel trims can bedamag ed. #
Remo vethewheel trims ofsteel wheels
bef oremounting snowch ains. Obser
vethefo llo wing noteswhen usingsno w
ch ains:
R Snow chains areonl yper missib leforcer tain
wheel/tir ecombinations. Youcan obtain infor-
mation aboutthis from anaut hor ized
Mer cedes-Benz Center.
R Forsaf etyre asons, onlyuse snowch ains that
ha ve been speci/call yappr ovedfo ryo ur vehi-
cle byMer cedes-Be nz,orsno wch ains with
th esame qualit yst andar d.
R Ifsno wch ains areins talled, themaximum per-
missible speedis30 mph(5 0km /h).
R V V
eh icle swi t eh
icle swi th A h
Act iv ct
ive P e
Par ar
king Assist ki
ng Assist : :
Do not
us eAc tivePa rking Assist whensnowch ains
ar eins talled. %
Youcan deactiv ateESP ®
to pull away
( / pag e159). Thisallowsthewheels tospin ,
ac hie vingan incr eased drivi ng forc e. TT
ir ir
e pr e
pr essur e essur
e NNo o
t t
es on tir es
on tirepr e
pr essur e essur
e &
W W
ARNIN G ARNIN
GRisk ofaccident duetoinsu1-
cient orexcessiv etir epr essur e
Un der in0a tedor ove rin0at edtire spose inpar -
ticu larthefo llo wing risk s:
R The tires can burst.
R The tires can wearexcessiv elyand/ or
une venly.
R The driving charact eristics aswellas the
st ee ring and brak ing charact eristics may
be greatl yim pair ed. #
Com plywit hth ere commen dedtirepr es-
sur esand checkth etir epr essur eof all
tir es, including thespar ewheel, regu-
lar ly: Wheels
andtires
293 293

R
Mont hly
R Whe nth eload chang es
R Beforeembar kingonalon gerjour ney
R Ifoper ating conditions chang e,e.g .o.-
ro ad drivi ng #
Adjust thetir epr essur e,ifnecessar y. Ti
re pressur ewhic his toohigh ortoolow can:
R Shor tenth eser vice life of thetir es.
R Cause increased tiredamag e.
R Adverselya.ect driving charact eristics and
th us driving safety, e.g. duetohydroplaning . &
W W
ARNIN G ARNIN
GRisk ofaccident duetotoolow
a tir epr essur e
Ti re swit hpr essur eth at istoolow can over-
heat andburstas aconse quence.
In addition, they also su.er from irre gula r
we ar,whic hcan signi/cantl yim pair thebr ak -
ing proper tiesand thehandling charact eris-
tics. #
Avoid excessiv elylo w tirepr essur e. Ti
re pressur ewhic his toolow can cause:
R Tire malfun ctionsasare sult ofove rheating
R Impair edhandling charact eristics
R Irre gula rwe ar
R Incr eased fuel consu mption &
W W
AR NIN G AR
NIN GRisk ofacciden tdue totoohigh
a tir epr essur e
Ti re swit hex cessiv elyhigh pressur ecan burst.
In additi on,they also su.er from irre gula r
we ar,whic hcan signi/cantl yim pair thebr ak -
ing proper tiesand thehandling charact eris-
tics. #
Avoid excessiv elyhigh tirepr essur es. Ti
re pressur ewhic his toohigh cancause:
R Incr eased braking distance
R Impair edhandling charact eristics
R Irre gula rwe ar
R Impair eddrivi ng comf ort
R Suscep tibilityto damag e &
W W
ARNIN G ARNIN
GRisk ofaccident duetorepea-
te dpr essur edr op inthetir es
The wheels, valves ortires could bedamag ed.
To olow atir epr essur ecan lead tothetir es
bur stin g. #
Examine thetir es forfo re ign objects. #
Chec kwhe ther thetir ehas apunctur eor
th eva lve has aleak . #
Ifyo uar eunable torectif yth edamag e,
cont actaqu ali/ed special istwo rkshop. Yo
ucan /ndinf ormation ontirepr essur efo rth e
ve hicle' sfa ct or y-inst alled tires on thefo llo wing
labels:
R Tire and Loadi ngInformatio nplacar don the
B‑pi llarof your vehicle (/page300) .
R Tire pressur eta ble ontheinside ofthefuel
/ller 0ap(/page295).
Obser vethemaximum tirepr essur e
(/ page306).
Use asuit able pressur ega ug eto checkth etir e
pr essur e.The outerappear anceofatir edoes not 294294
Wheels
andtires

per
mit anyre liable conclusion aboutthetir epr es-
sur e.
Onl ycor rect tirepr essur ewhen thetir es arecold.
Conditions forcold tires:
R The vehicle hasbeen parkedwit hth etir es out
of dir ect sunlight forat least thre ehour s.
R The vehicle hastrav eled lessthan 1mile
(1.6 km).
The vehicle' stir es heat upwhen drivi ng .As the
te mp eratur eof thetir es incr eases, sotoodoes
th etir epr essur e.
V V
ehicles wit ehicles
withatir h
atir epr e
pr essur essur
emonit e
monit or or
ing syst ing
system: em:
Yo ucan also checkth etir epr essur eusing theon-
boar dcom puter.
The tirepr essur ere commen dedforincr eased
load/speed inthetir epr essur eta ble can a.ect
th eride comf ort. &
W W
ARNIN G ARNIN
GRisk ofaccident duetounsuit a-
ble acces sories ontireva lves
If yo umount unsuitableacces sories ontotir e
va lves, thetir eva lves ma ybe overloaded and malfunction,
whichcan cause tirepr essur e
loss. #
Onlyscr ew stan da rd valve caps orvalve
caps speci/call yappr ovedby Mer cedes-
Benz foryo ur vehicle ontoth etir eva lve. TT
ir ir
e pr e
pr essur essur
et e
table able
The
tirepr essur eta ble ison theinside ofthefuel
/ller 0ap.
% The datasho wnintheimag esisex am ple
dat a. The
tirepr essur eta ble showsthere commen ded
tir epr essur efo rall tires appr ovedfo rth is vehicle.
The recommen dedtirepr essur esappl yfo rcold
tir es under various oper ating condition s,i.e. load-
ing and/or speedoftheve hicle.
If one ormor etir esize spr ecede atir epr essur e,
th efo llo wing tirepr essur einf ormation isonl yva lid
fo rth ose tiresizes andtheir respect ive load con-
diti on.
The load cond itions "partiallyladen" and"fully
laden" arede/n edintheta ble fordi.er entnum-
ber sof passeng ersand amounts oflugg age. The
actual number ofseats maydi.er from this. Wheels
andtires
295 295

Som
etir epr es su re tables onlysho wtherim diam-
et er inst ead ofthecom pletetiresize, e.g.R18 R18
.
The rim diame teris par tof thetir esize andcan
be found onthetir eside wall(/ page307).
R Tire and Loadi ngInformatio nplacar d
(/ page300)
R Maxim umtirepr essur e(/ page306) ChecChec
kingt king
the tir he
tirepr e
pr essur essur
emanu ally e
manu ally #
Read thetir epr essur ere commen dedforth e
cur rent ope rating condi tions from theTire and
Loadi ngInformatio nplacar dor thetir epr es-
sur eta ble. Obser vetheno teson tirepr essur e. #
Remo vetheva lve cap ofthetir eto be
ch ecked. #
Press thetir epr essur ega ug esecur elyont o
th eva lve. #
Read thetir epr essur e. #
Ifth etir epr essur eis lowe rth an there com-
mende dva lue, increase thetir epr essur eto
th ere commen dedvalue. #
Ifth etir epr essur eis higher than there com-
mende dva lue, release air.To do so, press
do wn theme talpin intheva lve, e.g. using the
tip ofapen. Then, checkth etir epr essur e
ag ain using thetir epr essur ega ug e. #
Screw theva lve cap ontoth eva lve.
Fu rther relat ed subjects:
R Noteson tirepr essur e(/ page293)
R Tire pressur eta ble (/ page295) R
Tire and Loadi ngInformatio nplacar d
(/ page300) TT
ir ir
e pr e
pr essur essur
emoni t e
moni tor or
ing syst ing
system em
FF
unct ionoft unct
ionofthe tir he
tirepr e
pr essur essur
emoni t e
moni tor or
ing syst ing
system em
&
D D
AN AN
GER GER
Riskofacciden tdue toincor rect
tir epr essur e
Eac htir e, incl udin gth espar e(if pro vided),
should becheckedmont hlywhen coldand
in0a tedto thein0 ation pressur ere commen -
ded bytheve hicle manu factur eron theve hi-
cle placar dor tirein0ation pressur elabel .(If
yo ur vehicle hastires ofadi.er entsize than
th esize indicat edon theve hicle placar dor
tir ein0ation pressur elabel ,yo ushould deter-
mine thepr oper tirein0 ation pressur efo r
th ose tires.)
As anadded safetyfe atur e,your vehicle has
been equipped withatir epr essur emoni toring
sy stem (TPMS) that illu min ates alow tirepr es-
sur ete lltale when oneormor eof your tires is
sign i/ca ntly under -in0at ed. Accor ding ly,when 296296
Wheel
sand tires

th
elow tirepr essur ete lltale illuminat es,you
should stop and checkyo ur tires assoon as
possible, andin0ateth em tothepr oper pres-
sur e.Driving onasign i/can tlyu nde r-in0 ated
tir ecauses thetir eto overheat andcanlead
to tirefa ilur e.Under -in0at ion also reduces fuel
e1ciency andtiretread life, and maya.ect
th eve hicle ’shandl ingand stoppin gabili ty.
Ple ase note that theTPMS isno ta substitut e
fo rpr oper tiremaint enance, anditis thedr iv-
er ’s responsi bilityto maint aincorrect tire
pr essur e,even ifunder -in0at ion has not
re ac hed theleve lto trigg erillum inatio nof the
TPMS low tirepr ess urete lltale.
Yo ur vehicle hasalso been equipp edwith a
TP MS malf unct ionindicat ortoindicat ewhen
th esy stem isno toper ating proper ly.The
TPMS malfunction indicatoris combined with
th elow tirepr essur ete lltale. When thesy stem
de tects amalfu nction, thete lltale will 0ashfo r
appr oximat elyone minut eand then remain
contin uouslyillumin ated. This sequence will
contin ueupon subseq uentvehicle star t-ups as
lon gas themalfunction exists. When
themalfunction indicatorisilluminat ed,
th esy stem mayno tbe able todetect or sign al
lo w tirepr essur eas intende d.TPMS malfu nc-
tion sma yoccur fora va riet yof reasons,
incl udin gth einst allation ofreplacement or
alt ernat etir es orwheels ontheve hicle that
pr eve nttheTPMS from function ingproper ly. The
system checks thetir epr essur eand thetir e
te mp eratur eof thetir es inst alled ontheve hicle by
means ofatir epr essur esensor .
The tirepr essur eand thetir ete mp eratur eappear
in theon-boar dcom puter(/ page297).
If th er eis asubst antial pressur eloss orifth etir e
te mp eratur eis excessiv e,youwill bewarned with
displa ymessag es(/ page379) orthe0077
wa rning lampin theinst rument cluster
(/ page399).
The tirepr essur emonit oring system isonl yan aid.
It is thedr iver's responsi bilityto setth etir epr es-
sur eto there commen dedcold tirepr essur esuit a-
ble forth eoper ating situation.
In most cases ,th etir epr essur emonit oring sys-
te m will automaticall yupdat eth ene wrefere nce va
lues aTer youha ve chang edthetir epr essur e.
Yo ucan, howev er,also updat eth ere fere nce val-
ues byrestar ting thetir epr essur emonit oring sys-
te m manuall y(/ page298).
Sy st Sy
stem limits em
limits
The system maybe impair edorma yno tfun ction
par ticular lyin thefo llo wing situations:
R Incor rect refere nce values weretaught in
R Sudden pressur eloss caused byafo re ign
object penetrating thetir e, forex am ple
R Ther eis amalf unct ioncaused byano ther
ra dio signal source
Chec Chec
kingt king
the tir he
tirepr e
pr essur essur
ewit e
wit ht h
the tir he
tirepr e
pr essur e essur
e
monit monit
or or
ing syst ing
system em
R R
eq equir uir
ements: ements:
R The vehicle isswitc hedon.
On- boar dcom puter:
4 Service5
Tires
One ofthefo llo wing displa ysappear s:
R Current tirepr ess ureand tirete mp eratur eof
th eindividual wheels: Wheels
andtires
297 297

R
Tire pressure willbedisplay edafter driving a
few minutes
R Tire Pressure MonitorActive: thete ac h-in
pr ocess ofthesy stem isno tyet com plete.The
tir epr ess ures arealr eady being monitored. #
Com pareth etir epr essur ewit hth ere com-
mende dtir epr essur efo rth ecur rent ope rating
condi tion(/page295) .Ad ditionall y,obser ve
th eno teson cold tires (/ page293).
% The values displa yedin theon-boar dcom-
put erma yde viat efrom those ofthetir epr es-
sur ega ug eas they referto sea leve l.At high
ele vations, thetir epr essur eva lues indicat ed
by apr essur ega ug ear ehigher than those sho
wnbytheon-boar dcom puter.In this case,
do notre duce thetir epr essur e.
R R
est est
ar ar
ting t ting
the tir he
tirepr e
pr essur essur
emonit e
monit or or
ing syst ing
system em
R R
eq eq
uir uir
ements: ements:
R The recommen dedtirepr essur eis cor rectl y
se tfo rth ere specti veoper ating status onallof
th ewheels (/page293).
Re star tth etir epr essur emonit oring system inthe
fo llo wing situations:
R The tirepr essur ehas chang ed.
R The wheels ortires have been chang edor
ne wly installed.
On-boar dcom puter:
4 Service 5
Tires #
Swipe down wardson Touc hContr olon the
leT-h andside ofthesteer ing wheel.
The Use Curre ntPressure sas New Refer-
ence Valuesmessag eis sho wnintheInstr u-
ment Displa y. #
Torestar t,pr es sTo uc hContr olon theleT-
han dside ofthesteer ing wheel.
The Tire Press. Monitor Restarted messageis
sho wnintheInstr ument Display.
Cur rent wa rning messa gesar edele tedand
th eye llo w0077 warning lampgoes out.
ATer youha ve been driving fora few minut es,
th esy stem checks whe ther thecur rent tire
pr ess ures arewit hin thespeci/ed rang e. The
cur rent tirepr ess ures areth en accep tedas
re fere nce values andmonit ored.
Be sureto also payatt ent ion tothefo llo wing rela-
te dto pic:
R Noteson tirepr essur e(/ page293) TT
ir ir
e pr e
pr essur essur
eloss w e
loss war ar
nin gsy st nin
gsy stem em
FF
unct ionoft unct
ionofthe tir he
tirepr e
pr essur essur
eloss w e
loss war ar
nin gsy st nin
gsy stem em
The tirepr essur eloss warning system warnsth e
dr iver by means ofdispla ymessag eswhen ther e
is ase vere tirepr ess ureloss . 298298
Whee
lsand tires