key MERCEDES-BENZ A-CLASS SEDAN 2021 Owner's Manual

Symbols
........................................................ 5 At
agl ance ....................................................6
Coc kpit ....... ..................... ..................... ..........6
Indica torand warning lam ps(stan dar d)........ 10
Indicat orand warning lam ps(Wide‐
scr een Cockpit)............................................ 12
Ov erhead controlpanel ................................ 14
Doo rop erati ng unitand seatad jus tment .....16
Emerg enciesand brea kdo wns ............ .......... 18 Digita
lOp erator' sMa nua l......................... 20
Callin gup theDigit alOper ator's Manual ...... 20 Gener
alno tes... .......................................... 22
Pr otect ing theen vironmen t... ....................... 22
Genuine Mercedes- Benzparts......................2 2
Oper ator's Manual ........................... .............2 3
Ser vice andvehicle operation ......... .............. 24
Oper ating safety...........................................2 5
Decl arati on ofconf ormity forwireless
ve hicle component s... ..................................2 6
Dia gno stics con nection ................................ 27 Qua
lified speci alistwo rkshop ....................... 28
Cor rect useof theve hicle ............................2 8
No tesfo rper sons withelectr onicmedi‐
cal aids..... ........................................ ............ 28
Pr oble mswithyo ur vehicle ............... ............ 29
Re por tingsaf etydef ects ...............................2 9
Limit edWarrant y.......................................... 30
QR cod efo rre scue card... ............... .............3 0
Dat ast or ag e... ..............................................3 0
Cop yright ...................................................... 35 Occup
antsafety.... .....................................36
Re stra int system .............................. .............3 6
Sea tbel ts<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011> 38
Airb ags<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> 42
PR E-S AFE ®
sy stem ....................................... 50
Au tomatic measu resaf te ran accide nt..... .... 51
Saf ely transp orting childr enintheve hi‐
cle ...... ........................................................... 51
No teson pets intheve hicle ............ .............6 5 Opening
andclosing .................................. 66
Smar tKey <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011> 66
Door s<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011001100110011> 70Tr
unk ............................................................ 73
Sid ewi ndo ws<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011001100110011001100110011> 77
Sli ding sunroof <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011> 80
Anti-t heftpr otect ion .....................................8 4 Seats
andstowing ...................................... 87
No teson thecor rect driver's seatpos i‐
tion <0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011001100110011>.......87
Sea ts<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011001100110011> 88
St eer ing wheel ..............................................9 5
Eas yentr yand exitfeatur e...........................9 6
Memor yfunct ion.......................................... 97
St ow agear eas .............................................. 98
Soc kets ........... ............................................ 105
Wi reless chargin gof themobile phone
and connect ionwithth eex terior ant enna ..105
Ins talling/ remo ving thefloor mats .............1 07 Light
andvisibili ty................................... 10 9
Ext eriorlighti ng............. .............................109
Int erior ligh ting ............................................ 114
Wi ndsh ield wipe rand windsh ield wa sher
sy stem ........................................................ 115
Mir rors <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011001100110011> 117 2
Contents

tio
nin their respectiv eoper ating instructions.
This information isalso available online and,
depen dingon theve hicle equipment, digitally.
Pe rsonal data
Ev eryve hicle isidentif iedbyauniq uevehicle
identif ication number .Depending onthecoun‐
tr y, this vehicle identif ication number canbe
used by,fo rex am ple, government alau thor ities
to determ ine theidentit yof theow ner .The reare
ot her possibili tiestouse dataco llec tedfrom the
ve hicle toident ifytheow ner ordriver ,su ch as
th elicense platenumber .
Ther efor e, dat age ner ated orproce ssedby con‐
tr ol uni tsma ybe attr ibut ab leto aper son or,
unde rcer tain con dition s,becom eatt ribut able to
a per son .De pen dingon whic hve hicle dataar e
av ailable, itma ybe poss ibletomak einf erences
abou t,forex am ple, your drivin gbeha vior,yo ur
loc atio n,your routeor your use pattern s.
Leg alrequ irement sre ga rding thedisclos ure
of data
If leg allyre qu ired todo so, manuf acturersar e, in
individual cases,legallyoblig edtoprov ide gov‐
er nm ent alent ities ,upon requ estand tothe ex
tent requ ired, datast or ed bythemanuf ac‐
tur er.Fo rex am ple, this ma ybe thecase during
th einve stigation ofacr imin aloffense.
Go vernment alentities areth emselv es,inindivid‐
ual cases andwithin theapplicable legalframe‐
wo rk,aut hor ized toread out datafrom theve hi‐
cle. Inthecase ofan acciden t,inf ormation that
can help withan inve stigation can,th er efor e, be
ta ke nfrom theairbag control unit, forex am ple.
Oper ational data intheve hicl e
This isdat are ga rding theoper ation oftheve hi‐
cle, whic hha ve been processed bycontr oluni ts.
Thi sincl udes thefo llo wing data,forex am ple:
R Vehicle status informat ionsuchas thespeed,
longitudin alacceler ation,lateral accelera ‐
tion ,number ofwheel revo lution sor thefa s‐
te ned seatbe lts displ ay
R Ambi entcond itions, such astemp eratur e,
ra in sen sor ordis tance sens or
Ge ner ally,th euse ofthese datais temp orar y;
th ey will notbe stor ed beyond theper iod of
oper ation andwillonlybe processed within the
ve hicle itself. Controlunits oftencont ain da ta memor
iesforve hicle keys,fo rex am ple. Their
use permitsth ete mp orar yor per manent docu‐
ment ation oftech nica linf orma tionab ou tth e
ve hicle's operating stat e, com ponent loads,
main tenance requ iremen tsand tech nica leve nts
or ma lfunctio ns.
Dep endingontheve hicle equipment, thefo llo w‐
ing dataar estor ed:
R Oper ating status ofsystem com ponen ts,
suc has fill le ve ls, tirepr essur eor batt ery
st atus
R Malfun ction sor faults inim por tant system
com ponen ts,suc has lights orbrak es
R System react ionsin spec ialdrivin gsit ua‐
tio ns,suc has airbag deploymentor theint er‐
ve ntio nof stabilit ycon trol systems
R Information oneve nts lead ing tovehicle
damag e
In cer taincas es, itma ybe requ ired tostor edat a
th at wo uld have other wise been usedonlyte m‐
por arily. This maybe thecase ifth eve hicle has
de tected amal functi on,forex am ple. Gene
ralno tes 31

Obser
vewhen stopping orpar king &
WARNIN GRisk ofacci dent andinjury
due tochildr enleftunat tende din the
ve hicle
If ch ildr enarelef tunsuper visedintheve hi‐
cle, they cou ld,in pa rticular :
R Open doors,ther eb yendang ering other
per sons orroad user s.
R Getout and bestru ck byoncom ingtraf‐
fi c.
R Ope rate vehicle equipment andbecome
tr apped, forex am ple.
In addit ion,th ech ildr encould alsosetth e
ve hicle inmo tion, forex am ple by:
R Releasing thepar king brak e.
R Changing thetra nsmiss ionposition .
R Startin gth eve hicle. #
Neverlea vechildr enunat tende din the
ve hicle. #
When leaving theve hicle, alwaysta ke
th eSmar tKey wit hyo uand lockth e
ve hicle. #
Keep theve hicle SmartKey out ofreac h
of childr en. &
WARNIN GDang ertolife due toexpo‐
sur eto extreme heat or col din theve hi‐
cle
If people, particular lych ildr en, areex posed
to extreme temp eratur esove ran extende d
pe riod oftime, ther eis arisk ofser ious
injur yor dang ertolife. #
Neverlea veper sons, childr eninpar tic‐
ular ,unat tende din theve hicle. Ov
ervie wof suitable seatsintheve hicl efo r
ins talling ach ild restra int system Lef
t/right rear seat
Pr efer redsecur ingsystem:
® LATC H-type (ISOFIX )ch ild seat anchor ¯
Alsosecur eTo pTe ther ifpr esent
(/ page58).
Alt ernativ esecur ingsystem:
0076 Ve
hicle seatbelt
Fr ont passeng erseat
Sec uring system:
0076 Ve
hicle seatbelt
Be sureto obser ve:
R Ifth efront passeng erseat isoccupied,
ensur e,bo th bef oreand during thejour ney,
th at thest atus ofthefront passeng erairbag
is cor rect forth ecur rent situa tion
(/ page 47).
R Observeth eno teson aut omatic front
passeng erairba gshut off(/ page45)
Cent errear seat
Secur ingsystem:
0076 Ve
hicle seatbelt
¯ Alsosecur eTo pTe ther ifpr esent
(/ page58). Occ
upant safety 55

#
Setth efront passeng erseat asfarbac kas
possi bleand movetheseat intoth ehighes t
position ifpossible. #
Adjus tth eseat cushion inclination sothat
th efront edgeof theseat cushion isin the
highes tposition andthebac kedg eof the
seat cushion isin thelowe stposition . #
Setth eseat backres tto themos tve rtical
posit ionpossible . #
Installth ech ild restra int system.
The entire base ofthech ild restra int system
mus talw aysre st on thesitt ing surface ofthe
fr ont passeng ersea t. #
Alw aysmak esur eth at theshoulder belt
st ra pis cor rectly routed from theseat belt
outle tof theve hicle totheshoulder belt
guide onthech ild restra int system.
The shoulder beltstra pmus tbe routed for‐
wa rdsand down wardsfrom theseat beltout‐
le t. #
Ifneces sary,adjus tth efront passeng erseat
accor dingly. Child
safetyloc ks Ac
tiv atin gor deac tivatin gthe child safety
loc kfo rthe rear door s &
WARNIN GRisk ofacci dent andinjury
due tochildr enleftunat tende din the
ve hicle
If ch ildr enarelef tunsuper visedintheve hi‐
cle, they cou ld,in pa rticular :
R Open doors,ther eb yendang ering other
per sons orroad user s.
R Getout and bestru ck byoncom ingtraf‐
fi c.
R Ope rate vehicle equipment andbecome
tr apped, forex am ple.
In addit ion,th ech ildr encould alsosetth e
ve hicle inmo tion, forex am ple by:
R Releasing thepar king brak e.
R Changing thetra nsmiss ionposition .
R Startin gth eve hicle. #
Neverlea vechildr enunat tende din the
ve hicle. #
When leaving theve hicle, alwaysta ke
th eSmar tKey wit hyo uand lockth e
ve hicle. #
Keep theve hicle SmartKey out ofreac h
of childr en. &
WARNIN GDang ertolife due toexpo‐
sur eto extreme heat or col din theve hi‐
cle
If people, particular lych ildr en, areex posed
to extreme temp eratur esove ran extende d
pe riod oftime, ther eis arisk ofser ious
injur yor dang ertolife. #
Neverlea veper sons, childr eninpar tic‐
ular ,unat tende din theve hicle. Occupant
safety 63

&
WARNIN GRisk ofacci dent andinjury
due tochildr enleftunat tende din the
ve hicle
If ch ildr enaretra veling intheve hicle, they
cou ld,in pa rticular :
R Open doors,ther eb yendang ering other
per sons orroad user s.
R Getout and bestru ck byoncom ingtraf‐
fi c.
R Ope rate vehicle equipment andbecome
tr apped, forex am ple. #
Alw aysactiv ateth eins talled child
saf etyloc ksifch ildr enaretra veling in
th eve hicle. #
Neverlea vechildr enunat tende din the
ve hicle. #
When leaving theve hicle, alwaysta ke
th eSmar tKey wit hyo uand lockth e
ve hicle. Ther
ear ech ild safetyloc ksforth ere ar door s
and there ar passe nger com partment side win‐
do ws . The
child safetyloc kon there ar door ssec ures
eac hdoor separat ely. The door scan nolong er
be opened from theinside. #
Press theleve rin dir ection 1(activ ate) or
2 (dea ctivate). #
Mak esur eth at thech ild safetyloc ksare
wo rking proper ly. Ac
tiv atin gor deac tivatin gthe child safety
loc kfo rthe rear side windo ws #
Toactiv ate/ deacti vate:pr ess button 2.
The rear side windowcan beope ned or
clos edinthefo llo wing cases :
R Indicat orlam p1 islit:via theswitc hon
th edr iver's door 64
Occupant safety

Smar
tKey Ov
ervie wof Smar tKey functio ns &
WARNIN GRisk ofacci dent andinjury
due tochildr enleftunat tende din the
ve hicle
If ch ildr enarelef tunsuper visedintheve hi‐
cle, they cou ld,in pa rticular :
R Open doors,ther eb yendang ering other
per sons orroad user s.
R Getout and bestru ck byoncom ingtraf‐
fi c.
R Ope rate vehicle equipment andbecome
tr apped, forex am ple.
In addit ion,th ech ildr encould alsosetth e
ve hicle inmo tion, forex am ple by:
R Releasing thepar king brak e.
R Changing thetra nsmiss ionposition .
R Startin gth eve hicle. #
Neverlea vechildr enunat tende din the
ve hicle. #
When leaving theve hicle, alwaysta ke
th eSmar tKey wit hyo uand lockth e
ve hicle. #
Keep theve hicle SmartKey out ofreac h
of childr en. *
NO
TEDama getotheSmar tKey cau sed
by magne ticfields #
Keep theSmar tKey away from stro ng
ma gne ticfields. 1
Locks
2 Indicat orlam p 3
Unloc ks
4 Opens thetrunk lid
5 Panic alar m
% Ifind icatorlam p2 does notlig ht up afte r
pr essing theÜ orß button,thebat‐
te ry iswe ak orposs iblydisc harged. Re place
th ebatt eryas soon aspossible.
Re place theSmar tKey batt ery(/ page68).
The Smar tKey loc ksand unlocksth efo llo wing
com pone nts:
R Doo rs
R Fuelfiller flap
R Trunk lid
If th eve hicle isno topened within appr oximat ely
40 seco ndsafte runloc king,itloc ksagain. Anti-
th eftpr otect ion isarmed again.
Do notke ep theSmar tKey toget her withelec‐
tr onic devices orme talobje cts. This canaffect
th eSmar tKey 's functionality . 66
Opening andclosing

Ac
tiv atin g/deac tivatin gthe acoustic lock ing
ve rificat ion signa l Mult
imed iasystem:
4 © 5
Set ting s5
Vehicle #
Activateor deacti vate Acou sticLock . Ac
tiv atin g/deac tivatin gthe pani calar m Re
quirement s:
R The ignit ionisswitc hedoff. #
Toactiv ate: press butt on1 forapp rox‐
ima tely one second.
A visual andaudibl ealar mistrigg ered. #
Todeac tivate: briefly pr ess button1 again.
or #
Press thest ar t/ stop butt ononthecoc kpit,
wit hth eSmar tKey insid eth eve hicle. Changing
theunloc kingsettings Po
ssible unlockingfunctions oftheSmar tKey :
R Cen tralunlo cking
R Unloc kin gth edr iver's door andfuel filler flap #
Toswitc hbe tw een settings: press the
Ü andß buttonssimul taneousl yfo r
appr oximat elysix seco ndsuntilth eindicat or
lam pflashes twice.
Op tions ifth eunloc kingfunction forth edr iver's
door andfuel filler flap has been selected:
R Tounlo cktheve hicl ece ntr ally:press the
Ü buttontwice.
R Vehicl eswith KEYLESS-GO :if yo uto uc h
th einner surface ofthedoor handle onthe
dr iver's door ,onl yth edr iver's door andfuel
fi ller flap areunlo cked. Deactiv
atingtheSmar tKey functio ns If
yo udo notuse theve hicle oraSmar tKey for
an extende dpe riod oftime, youcan reduce the
ener gycon sum ption ofthere spectiv eSmar tKey .
To do so, deactiv ateth eSmar tKey functions. #
Todeac tivate: press theß buttononthe
Smar tKey twi ce inqu ick succ ession .
The Smar tKey indic ator lam pflashes twice
br ief lyand light sup once. #
Toactiv ate: press anybutt onontheSmar t‐
Ke y.
% When theve hicle isstar tedwit hth eSmar t‐
Ke yin thestor ag ecom partmen tof thecen‐
te rconsole, theSmar tKey functions are
au tomatical lyact ivat ed (/ page12 7). Op
ening an dclos ing 67

Re
mo ving /ins ertin gthe eme rgency key Re
mo ving the eme rgency key #
Press release knob 1.
Em erge ncy key2 ispush edout slightly. #
Pull outemer gency key2 untilit en gage sin
th eint ermediat eposition .
% Depen dingontheve hicle's equipment, the
int ermediat eposit ionisno tav ailable. #
Press release knob 1 again and fully
re mo veemer gency key2. Inser
ting theemer gency key #
Press release knob 1. #
Insertemer gency key2 totheint ermediat e
position orfull yuntil iteng ages.
% Youcan usetheint ermediat eposition of
emer gency key2 toatt achth eSmar tKey to
a ke yring. Re
plac ingthe Smar tKey batt ery &
DANG ER Serious damag eto healt h
caused byswallo wing batteries
Batt eries cont aintoxic and corrosiv esub‐
st anc es.Swallo wing batteries ma ycause
ser ious damag eto healt h.
Ther eis arisk offata linj ury. #
Keep batt eries out ofthere ac hof chil‐
dr en. #
Ifbatt eries aresw allo wed,seek medical
att ent ion immediat ely. +
ENVIR
ONMEN TALNO TEEnvironme ntal
da ma gedue toimproper disposal ofbat‐
te ries Batt
eries con tain polluta nts. Itis
illeg alto dispose ofthem withth ehousehold
ru bbish. #
Dispose
ofbatt eries inan
en vironmen tally re sponsible manner.
Ta ke disc hargedbatt eries toaqu alif ied
spec ialistwo rkshop ortoacol lection
poin tfo rused batteries. Re
quirement s:
R Youre qu ire aCR 203 23V cell battery.
Mer cedes-Ben zre comme ndsthat youha ve the
batt eryre placed ataqu alif ied spec ialistwo rk‐
shop. 68
Opening andclosing

#
Remo vetheemer gency key(/ pag e68 ). #
Press release knob 2 down fullyand slide
co ver1 inthedir ect ion ofthear row . #
Foldout cover1 inthedir ect ion ofthe
ar row and remo ve. #
Remo vebatt erycom partmen t3 and take
out thedisc hargedbatt ery. #
Inser tth ene wbatt eryint obatt erycom part‐
ment 3.Obser vethepositiv epole marking
in thebatt erycom partmen tand onthebat‐
te ry when doingth is. #
Push inbatt erycom partment 3. #
Re-att achco ver1 and push ituntil it
eng ages. Pr
obl ems with theSm artK ey ,tr oub lesho ot‐
ing Yo
ucan nolon gerlo ck orunloc kth eve hicl e
Po ssible causes:
R The Smar tKey batt eryis we ak ordisc harged.
R The Smar tKey isfaulty . #
Chec kth ebatt eryusing theindicat orlam p
(/ page66). #
Replace theSmar tKey batt ery, ifnec essar y
(/ page68). #
Use theemer gency keyto loc kor unloc k
(/ page72 ). #
Have theSmar tKey checkedat aqu alif ied
spec ialistwo rkshop. Ther
eis int erfere nce from apo we rful radio
sig nal source
The Smar tKey function isim pai redby ,fo rex am‐
ple:
R Highvo ltag epo we rlines
R Mobi lephones
R Electr onicdevices (notebook s,table ts)
R Shielding duetome talobje ctsor induc tion
loops forelectr icalgate systems oraut o‐
matic barrier s #
Mak esur eth at ther eis suf ficie ntdist anc e
be tween theSmar tKey and thepo tentia l
sou rceof interfere nce.
Yo uha ve los ta Sma rtKe y #
Have theSmar tKey deactiv ated ataqu alif ied
spec ialistwo rkshop. #
Ifnecessar y,ha ve themec hanical lock
re placed aswell. Open
ingand closing 69

Door
s Un
loc king/opening thedoor sfrom theinsid e #
Tounlo ckand open afront door :pul ldoor
handl e1. #
Tounlo ckare ar door :pul lth ere ar door
han dle. #
Toopen are ar door :pul lth ere ar door han‐
dle again. Cent
rally loc king andunloc kingtheve hicl e
fr om theinsid e #
Tounlo ck:pr ess button 1. #
Toloc k:press butt on2.
The redindicat orlam pon butt on2 onthe
dr iver or front passeng erdoor lights uponc e
th eve hicle isloc ked. %
Youcan also lockand unlocktheve hicle
wit hth ebutt ons onthefront passeng erdoor
and rear door s.
This does notloc kor unlo ckthefuel filler flap.
The vehicle isno tunloc ked:
R Ifyo uha ve loc kedth eve hicle using the
Smar tKey .
R Ifyo uha ve loc kedth eve hicle using KEY‐
LESS -GO. Loc
king/unloc kingtheve hicl ewith KEY‐
LES S-GO Re
quirement s:
R The Smar tKey isouts idetheve hicle.
R The distance betwee nth eSmar tKey and the
ve hicle does notex ceed 3ft (1 m).
R The driver's door andthedoor atwhic hth e
door handle isused areclosed. 70
Openin gand closin g