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

St
arting theve hicl evia Remo teOnline serv‐
ices Cooling
orheating theve hicl eint erior before
co mmenci ngyour jour ney
Ensur eth efo llo wing beforest ar tin gth eengine:
R The legalstipulation sin thear ea wher eyo ur
ve hicle ispar kedallo wengin est ar tin gvia
smar tphon e.
R Itis saf eto star tand runth eengine where
yo ur vehicle ispar ked.
R The fuel tank issu fficien tly full.
R The star terbatt eryis suf ficie ntly charge d.
Char ging thest ar terbatt erybe fore star ting
th ejou rney
If th eve hicle batteryis disc harged, youcan
re cei veames sageon your smar tphon e.Youcan
th en star tth eve hicle withth esmar tphon eto
ch arge thebatt ery. The vehicle isaut omaticall y
switc hedoffaf te rte nminu tes. Ensur
eth efo llo wing beforest ar tin gth eengine:
R The legalstipulation sin thear ea wher eyo ur
ve hicle ispar kedallo wengin est ar tin gvia
smar tphon e.
R Itis saf eto star tand runth eengine where
yo ur vehicle ispar ked.
R The fuel tank issu fficien tly full.
St arting theve hicl e(R emo teOnline) &
WARNIN GRisk ofcrus hing orentr ap‐
ment dueto unin tentio nalstar tin gof the
engine
Limbs couldbecrushed ortrapped ifth e
engine isstar tedunint entionall ydur ing
ser vice ormaint enanc ewo rk. #
Alw ayssecur eth eengine agains tunin‐
te ntio nalstar tin gbef orecar rying out
maint enanceorrepair work. Re
quirement s:
R Park position 005Disselect ed.
R The anti- theftalar msystem isno tactiv ated.
R The panic alarmisno tactiv ated. R
The hazar dwa rning light system isswitc hed
of f.
R The hood isclosed.
R The door sar eclosed andlocked.
R The windo wsand slidin gsun roof areclosed. #
Startth eve hicle using thesmar tphon e.
Af tereve ryengine star t,th eengine runs for
te nminu tes.
Yo ucan carryout amaximum oftwoconsec u‐
tiv est ar tin gatt em pts. Yo umus tst ar tth eve hicle
once withth eSmar tKey bef oretrying tostar t
th eengine again withth esmar tphon e.youcan
st op theve hicle again atanytime.
% Further information canbefound inthe
smar tphone app.
Secur ingtheengine agains tst ar ting before
car rying out maintenance orrepair work: #
Swi tchon thehazar dwa rning light system.
or #
Unloc kth edoor s.
or 12
8
Driving and parking

%
The actual (maximum) values that can be
ac hie vedfo rengine outputand engine tor‐
qu ema yde viat efrom thecer tified values
wit hin thecount ry-spe cificgu ideline sfo r
per missible toler anc es(basis: UN-ECE No.
85 orcount ry-spe cificgu ideline s).
Fa ctor sth at can influen cethis are, forex am‐
ple:
R Sea leve l
R Fuelgrade
R Outside temp eratur e
R Oper ating temp eratur eof theengine
% The values displa yedser veonl yas orient a‐
tion. Thevalues forengine outputand
engine torq ue show nin themedia display
ma yde viat efrom theactual values. Calling
uptheconsum ption indicat or Multime
diasystem:
4 © 5
Info #
Select Consumpt ion.
The current and average consu mptionis dis‐
pl ay ed. Au
tomatic trans mis sion DI
REC TSE LECT leve r Fu
nction oftheDIRECT SELECT leve r &
WARNIN GRisk ofacci dent dueto inc or‐
re ct gearshif ting
If th eengine speedishigher than theidle
speed andyouen gage thetransmission posi‐
tion 005Bor005E, theve hicle mayacceler ate
shar ply. #
Ifyo uen gage thetransmission position
005B or005E when theve hicle isat a
st ands till,alw aysdepr essthebr ak e
pedal firm lyand donotacc eler ateat
th esame time. &
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. Dr
iving andparking 13
7

#
Keep theve hicle SmartKey out ofreac h
of childr en. Use
theDIRE CTSELECT leve rto switc hth e
tr ans missi on positio n.The current trans mis sion
po sitio nis displ ayed inthemultifunc tiondispla y. 005D
Park position
005E Reversege ar 005C
Neut ral
005B Drive po sitio n
En gaging reve rsege ar R #
Depr essthebr ak epedal andpush the
DIR ECT SELEC Tleve rupw ards pas tth efirs t
point ofresis tance.
En gaging neutr alN #
Depr essthebr ak epedal andpush the
DIR ECT SELEC Tleve rup ordown tothefirs t
point ofresis tance.
% Toshif tint oneutr al005C withth eignition on,
push theselect orleve rup ordown forse v‐
er al seconds tothefirs tpo int ofresis tance.
Sub sequently releasing thebr ak epedal will
allo wyo uto mo vetheve hicle freel y,e.g. topush
it or tow itaw ay.
Pr ocee das follo ws ifyo uwa nttheaut oma tic
tr ansm ission toremain inne utr al005C 005C,
evenif
th eignit ionisswitc hedoffor thedr iver' s
door isopened : #
Dep ress thebr ak epedal andengageneutral
005C when theve hicle isat ast ands till. #
Release thebr ak epedal. #
Switc hth eignition off.
% Ifyo uth en exitth eve hicle leaving the
Smar tKey intheve hicle, theaut omatic trans‐
mission remains inneutr al005C.
Eng aging parkpositio nP #
Obser vetheno teson par king theve hicle
(/ page14 4). #
Depr essthebr ak epedal untiltheve hicle is
at ast ands till. #
When theve hicle isat ast ands till,pr ess but‐
to n005D.
Whe nth etransmission positiondisplay
sho ws005D,th epar kposition iseng aged. Ifno
tra nsmiss ionposition display005D appear s,
secur eth eve hicle topreve ntitfrom rolling
aw ay.
% Dep endingonthesituation ,it ma yta ke a
shor ttime until005Diseng aged. Ther efor e,
alw ayspa yatt ention tothetra nsmiss ion
position display. 13
8
Driving and parking

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 thetransmission position.
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 getotheve hicle duetoit
ro lling away #
Alw ayssecur eth eve hicle agains tro ll‐
ing away. #
Bring theve hicle toast ands tillby pressing
th ebr ak epedal. #
Ongradients, turnth efront wheels sothat
th eve hicle willrollto wa rdsth ecurb ifit
st ar ts mo ving. #
App lytheelectr icpar king brak e. #
Vehicl eswith automatic transmiss ion:
Eng agetransmis sionposition 005Dinast atio n‐ ar
yve hicle withth ebr ak epedal applied
(/ page13 8). #
Switc hof fth eengine andtheignition by
pr essing button1. #
Release theser vice brak eslo wly. #
Getout oftheve hicle andlockit.
% When youpar kth eve hicle, youcan still
opera tetheside windo wsand thepanor amic
sliding sunroofforapp roxima tely four
min utes ifth edr iver's door isclosed. Gar
agedoor opener Pr
og rammin gbutt onsfo rthe garage doo r
ope ner &
DANG ER Risk ofdeat hcause dby
ex haus tga ses
Combus tionengines emitpoisonous exhaus t
ga ses suchas carbon monoxide.Inhaling
th ese exhaus tga ses ishazar dous tohealt h
and leads topoisonin g. Dr
iving andparking14
5

Clear
ingthega rage doo rope nermemo ry #
Press and hold buttons 1and 3.
Indicat orlam p4 lights upyello w. #
Ifindicat orlam p4 flashes gree n: release
butt ons 1and 3.
The entire memo ryhas been deleted. Electr
icpar king brak e Fu
nction oftheelectr icpa rking brak e(app ly‐
ing automat ically) &
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. The
elect ric pa rking brak eis applied ifth etra ns‐
mission isin position 005Dand one ofthefo llo w‐
ing con dition sis fulf illed:
R The engin eis switc hedoff.
R The seat belttongu eis no tins ertedin the
seat beltbuckleofthedr iver's seat andthe
dr iver's door isopened.
% Toprev ent application: pullthehandle ofthe
electr icpar king brak e(/ page14 9). In
thefo llo wing situat ions,th eelectr icpar king
br ak eis also applied:
R ActiveDis tance AssistDIS TRONI Cis bring ing
th eve hicle toast ands till.
R The HOL Dfun ction iske eping theve hicle sta‐
tio nar y.
R ActivePa rking Assistis ke eping theve hicle
st atio nary.
This isthecase ifone ofthefo llo wing condition s
is also fulfilled:
R The engin eis switc hedoff.
R The seat belttongu eis no tins ertedin the
seat beltbuckleofthedr iver's seat andthe
dr iver's door isopened.
R Ther eis asy stem malfunct ion.
R The powe rsupp lyis insuf ficie nt.
R The vehicle isstatio naryfo ra lengt hyper iod.
When theelectr icpar king brak eis applied, the
re d0049 (USA)or0024 (Canada) indicatorlam p
lights upintheins trument cluster. 14
8
Driving and parking

-
Edg elighti ng
- Day/nig htdesign
R Contr oleleme nts
- Keyboar dlan guag eand handwr itin g re c‐
ogni tion
- Sensi tivityof theto uc hpad
- Sen sitivit yof theTo uc hCon trols
R Voice Cont rolSy stem
R Sound
- Entertainm ent
- Navig ation andtraf fic annou ncements
- Telephon e
- Voice amplif icat ion tothere ar com part‐
men t
R Con nectivity
- Wi-Fi, Bluetoo th®
,NFC
R MBUX Remo teCon trol
- Author izing anddeaut horizing devices
R Time &dat e
R Langu age R
Units fordis tance
R Softwareup dates
R Dat aimpor t/expo rt
R PIN protect ion
R System Reset Inf
ormat iononimpor tant system updates Im
por tant system updat esma ybe neces saryfo r
th esecur ityofyour mult imed iasystem's data.
Ins tallth ese updat es,orelse thesecur ityofyour
mult imed iasystem cann otbe ensur ed.
A sy stem updat econ sistsof thre esteps:
R Downloading orcop ying ofthedat are qu ired
fo rins tallation
R Installation ofthedo wnloaded system updat e
R Activati on ofthedo wnloaded system updat e
by restar tin gth esy stem
% Ifaut omatic softwareupdat esareactiv ated,
th esy stem updat eswill bedownloaded auto‐
maticall y. The
multimedia system prov ides amess age
when asy stem updat eis available.
Yo uha ve thefo llo wing selectionoption s:
R Accept andInstall
The system updat ewill bedownloaded inthe
bac kground .
R Infor mat ion
In fo rm atio nabout thepending system
updat eis displa yed.
R Later
The system updat ecan bedownloaded man‐
uall yat alat er time.
Deep system updates
Dee psy stem updat esaccess vehicle orsystem
se ttings andcanther efor eonl ybe car ried out
when theve hicle isstatio naryand theignition is
switc hedoff.
If th edo wnload ofadeep system updat eis com‐
ple tedand thedo wnloaded system updat eis
re ady forins tallation ,yo uwill beinformed ofthis
af te rth ene xt ignition cycle, forex am ple. 21
8
MBUX multimedia system

%
Park theve hicle safely inasuit able location
bef orest ar tin gth eins tallation .
Re quiremen tsforth eins tallation :
R The ignit ionisswitc hedoff.
R Notesand warnings have been read and
acc epted.
R The elect ric pa rking brak eis applied.
If all requ iremen tshave been fulfilled, thedo wn‐
loaded system updat eis ins talled. Themultim e‐
dia system cann otbe oper ated while thedo wn‐
loaded system updat eis being installed and
ve hicle functionsarere strict ed.
If er ro rs should occurduring theins tallation ,th e
multime diasystem automaticall yatt em ptsto
re stor eth epr ev ious version. Ifre stor ation ofthe
pr ev ious version isno tpossible ,a symbol
appear son themedia display.Con sult aqu ali‐
fi ed specialis two rkshop toresolv eth epr oblem. Se
tting upaWi -Fiho tspo t Re
quirement s:
R Tosetup theWi -Fico nne ctio nof themu l‐
tim edia system withex tern al ho tspo ts:
th er eis no comm unication moduleinstalled.
R The device tobe con nectedsuppor tsat leas t
one ofthetypes ofcon nect iondescr ibed.
Multimedia system:
4 © 5
Set ting s5
System
5 Wi-Fi &Bluetoot h
Ac tiv atin g/deac tivatin gWi -Fi #
Sele ctWi-Fi .
Co nne ctin gth emu ltim edia system withan
ex tern al ho tspo tusin gWi -Fi
The type ofconnection established mustbe
select edon themultimedia system and onthe
de vice tobe con nected.
% The connection procedur ema ydif fer
dependin gon thede vice. Followtheins truc‐
tion sth at aresho wninthedispla y.Fu rther
inf ormation canbefound inthemanuf actur‐
er's oper ating instruction s. #
Select Internet Setting s. #
Select Connec tvia Wi-Fi. #
Select AddHotspot.
Connecting usingasecur itykey #
Select theop tion s0048 ofthedesir edWi-Fi
ne twork. #
Select Connect UsingSecu rityKey. #
Have thesecur itykeydisp laye don thede vice
to be con nected(see themanuf acturer's
oper ating instruction s). #
Enterth is secur itykeyon themultimedia sys‐
te m. #
Conf irm theent rywit h¡.
Connecti ngusing aWPS PIN #
Sele cttheop tion s0048 ofthedesir edWi-Fi
ne twork. #
Select Connect viaWPS PINInpu t.
The multime diasy stem gener ates an eight-
di gitPIN . #
Enterthis PIN onthede vice tobe con nected. #
Conf irm theent ry. MBUX
multimedia system 21
9

Connect
ingusin gabut ton #
Select theop tion s0048 ofthedesir edWi-Fi
ne twork. #
Select Connect viaWPS PBC. #
Select "Connect viaWPS PBC"in theop tion s
on thede vice tobe con nected(see theman‐
uf actur er'soper ating instruction s). #
Press theWPS buttonon thede vice tobe
con nected. #
Select Continue inthemultimedia system.
Ac tiv atin gaut omati cco nn ectio n #
Select Connect viaWi-Fi. #
Select theop tion s0048 ofthedesir edWi-Fi
ne twork. #
ActivatePe rma nent InternetConnecti on.
Co nnectin gwi th akno wnWi-Fi #
Sele ctConnect viaWi-Fi . #
Sele ctaWi -Fi network.
The conn ection ises tablished again. Conf
iguringthemu ltim edia system asaWi -
Fi ho tspo tfo rex tern al de vic es
The type ofconnection established depends on
th ede vice tobe con nected. The func tion must
be suppor tedby themultimedia system and by
th ede vice tobe con nected. The type ofcon nec‐
tion established mustbe select edon themulti‐
media system and onthede vice tobe con nec‐
te d. #
Select Vehicle Hotspot. #
Select Connec tDevic eto Vehicle Hotspot.
Connecting usingWPSPINgener ation #
Select Connec tvia WPS PINGeneration. #
Enterth ePIN showninthemedia displayon
th ede vice tobe con nectedand confirm .
Connect ingusin gWPS PINentr y #
Sele ctConn ectviaWPS PINInput. #
Enterth ePIN that issho wnontheex tern al
de vic e's displa yon themultimedia system.
Connecting usingabutt on #
Select Connec tvia WPS PBC. #
Press thepush buttononthede vice tobe
con nected(see themanuf acturer'soper ating
ins truction s). #
Select Continue.
Connecting usingasecur itykey #
Select Connect DevicetoVeh icleHotsp ot.
A secu rity keyis disp laye d. #
Select theve hicle from thede vice tobe con ‐
nec ted. The vehicle isdispla yedwit hth e
DIR ECT -MBU XXXX XXnetworknam e. #
Enterthesecur itykeywhic his sho wninthe
media display on thede vice tobe con nected. #
Conf irm theent ry.
Connect ingusin gNFC #
Sele ctConn ectviaNFC. #
ActivateNFC onthemobile device (see the
manuf acturer'soper ating instructions). #
Hold thede vice tobe con nectedat theve hi‐
cle's NFCinterface. #
Sele ctFini shed.
The mob ile de vice isno wconnect edtothe
multime diasystem hotspo tvia NFC. 220
MBUX multimedia system

Gene
ratin gane wse cur itykey #
Select Veh icleHotsp ot. #
Select Genera teSecu rityKey.
A connecti onwillbe established withth e
ne wly crea tedsecur itykey. #
Tosave asec urity key:select Save.
When ane wsecur itykeyis save d, all existin g
Wi -Fi conne ctionsareth en discon nected.If
th eWi -Fi conne ctionsarebe ing re-es tab‐
lished, thene wsecur itykeymus tbe entere d. Na
vig ation Switc
hingnavig ation on Multimedia
system:
4 © 5
Navigation (Navigation ) #
Alternat ivel y: press thez button.
The map showstheve hicle's current posi‐
tio n.The navig ation menu issho wn.
The navig ation menu ishidd en ifro uteguid‐
anc eis act ive. #
Tosho w:tapon theto uc hsc reen.
The menu ishidden automaticall y. MBUX
multimedia system 22
1

To
avo iddamag eto theve hicle, deactiv ate
th ese systems inthefo llo wing orsimilar sit‐
uation s: #
Dur ing towing #
Inacar wash *
NO
TEDama gedue touns uitable car
wa sh #
Beforedr iving intoacar wash mak e
sur eth at thecar wash issuit able for
th eve hicle dimensions. #
Ensur eth er eis suf ficie ntgrou nd clear‐
ance between theunderbody andthe
guide rails ofthecar wash. #
Ensur eth at theclear ance widthof the
car wash, inpar ticular thewidt hof the
guide rails, issuf ficie nt. To
avo iddamag eto your vehicle when usinga
car wash, ensur eth efo llo wing beforehand:
R ActiveDis tance AssistDIS TRONI Cis de acti ‐
va ted.
R The HOLD function isswitc hedoff. R
The surround viewcam eraor there ar vie w
cam erais swit ched off.
R The side windo wsand slidin gsun roof are
com pletely clos ed.
R The blowe rfo rth eve ntil ation/he ating is
sw itched off.
R The windsh ield wipe rsw itchis in po sitio n
005A.
R The Sma rtKe yis at amin imum distance of
10 ft(3 m) away from theve hicle. Other wise,
th etrunk lidcould openunintentionall y.
R Forcar washes withacon veyo rsy stem: neu‐
tr al 005C iseng aged.
% Incar washes withacon veyo rsy stem: ifyo u
lea vetheve hicle while itis being washed,
mak esur eth eSmar tKey islocat edinthe
ve hicle. Theparkposition 005Disother wise
aut omaticall yeng aged.
% If,afte rth ecar wash, youre mo vethewa x
fr om thewindshield andwiper rubber s,this
will preve ntsme aring and reduce wiper
noise. Au
tomatic carwa sh mode
In car wash mode, theve hicle isprepar edfor
dr iving intoth eaut omatic carwash. Car wash
mode canbeactiv ated ataspeed ofup to
12 mp h(20 km/h)(/ page259).
The follo wing settings aremade whencarwash
mode isactiv ated:
R The outside mirrors arefo lded in.
R Topreve ntthewindshield washer system
fr om star tin gup aut omat ically,thera in sen ‐
sor isdeact ivat ed.
R The rear wind owwiper isdeact ivat ed.
R The aircon ditionin gsy stem issetto air-reci r‐
culat ionmode .
R Parking AssistPA RK TRONI Cis deac tiva ted.
R Vehicl eswith surround viewcamer a:the
fr ont imageisact ivat ed afte rapp rox. eight
seco nds.
If one ofthese ttings cann otbe select ed,this is
displa yedby a% behindth ere spectiv ese t‐
ting.
Ab oveaspeed of12 mp h(2 0km/h) carwash
mode isaut omaticall ydeactiv ated. 258
Maintenance andcare