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

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

#
Tounlo cktheve hicl e:touc hth einner sur‐
fa ce ofthedoor handle. #
Toloc kth eve hicl e:touc hsen sor surface
1 or2. #
Convenience closing:touc hre cess edsen‐
sor surface 2untilth eclosing process has
been completed.
% Further information oncon venie nce closing
(/ page 79) . If
yo uopen thetrunk lidfrom outside, thetrunk
lid isaut omaticall yunloc ked. Pr
oblems withKEYLE SS-GO, troubleshoo ting Yo
ucan nolon gerlo ck orunloc kth eve hicl e
using KEYLESS-GO
Po ssible causes:
R The Smar tKey functions have been deactiv a‐
te d.
R The Smar tKey batt eryis we ak ordisc harged.
R The Smar tKey isfaulty . #
Activateth eSmar tKey functions
(/ page67 ). #
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 theve hicle andSmar tKey checkedat a
qu alif ied spec ialistwo rkshop. Ther
eis int erfere nce from apo we rful radio
sig nal source
The KEYLESS-G Ofuncti onisim pa ired by,fo r
ex 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. Ac
tiv atin g/deac tivatin gthe automati clo ck ‐
ing featur e The
vehicle isloc kedaut omatic allywhen the
ignit ionisswitc hedonand thewheels aretur n‐
ing faster than walkin gpace. Open
ingand closing 71

Con
venience closing (closing theve hicl e
fr om outside ) &
WARNIN GRisk ofentr apment dueto not
pa ying attenti onduring con venie nce
clo sing
Whe nth econ venie nce closing featur eis
oper ating,par tsof thebody could become
tr apped intheclosing area oftheside win‐
do wand thesliding sunroof. #
When thecon venie nce closing featur e
is operatin g,mon itor theent ire closing
pr ocess andmakesur eth at no body
par tsarein theclosing area. #
Press and hold theß buttononthe
Smar tKey .
The follo wing functionsar eper form ed:
R The vehicle isloc ked.
R The side windo wsareclo sed.
R The pano ramic sliding roof isclosed. #
Tointerru pt con venience closing: release
th eß button. #
Toclose thero ller sunblind s:press and
hold theß buttonagain.
% Con venie nce closing also func tions with
KEYLESS- GO(/ page70). Re
sol ving problems withtheside windo ws &
WARNIN GRisk ofbeco ming trap ped or
fa ta lly injured ifre ve rsing protect ion is
no tactiv ated
If yo uclo seaside windowagain imm ediat ely
af te rit has been blocked, theside windo w
will close withincr eased ormaximum forc e.
The reve rsing func tion isthen notactiv eand
body partsma ybecome trapped. #
Mak esur eth at no par tsof thebody are
in theclosing area. #
Tostop theclosing process, release the
butt onorpress thebutt onagain to
re open theside windo w. A
sid ewind owcann otbe closed andyoucan‐
no tsee thecaus e. #
Chec kto see whether anyobjec tsarein the
windo wguide. #
Adjus tth eside windo ws.
Ad jus tingthe side windo ws
If aside windo wisobs truct eddur ing closing and
re opens again immediat ely: #
Immediat elyaf te rth is, pull and hold thecor‐
re sponding buttonagain until theside win‐
do whas closed andhold thebutt onforat
lea stone moresecond (re-adjus tment).
The side windo wwill beclosed without the
aut omat icreve rsing func tion.
If th eside windo wisobs truct edagain and
re opens again immediat ely: #
Immediat elyaf te rth is, pull and hold thecor‐
re sponding buttonagain until theside win‐
do whas closed andhold thebutt onforat Opening
andclosi ng 79

R
Afterpr essing thest ar t/ stop butt onwithth e
Smar tKey inthestor ag ecom partmen t
(/ page12 7)
% When theMer cedes‑ Benzemergency call
sy stem isactiv eand thealar mstay son for
mor eth an 30 sec onds, ames sageis aut o‐
mat icall ysen tto theCus tomer Assis tance
Ce nter (/ page 239) .
% Inthecase ofsevere batt erydisc harging,
th eanti- theftalar msystem isaut omaticall y
deactiv ated tofacil itat eth ene xt engine
st ar t.
Deact ivat ing theATA #
Press theÜ, ßor008B buttononthe
Smar tKey .
or #
Press thest ar t/ stop butt onwithth eSmar t‐
Ke yin themar kedspace (/page12 7)
Dea ctivat ingth eala rm using KEYLESS-GO #
Grasp theoutside doorhandle withth e
Smar tKey outside theve hicle. Fu
nction oftheto w- aw ay alar m %
This function mayno tbe available inall
coun tries.
An audible andvisual alarmistrigg ered ifan
alt eratio nto your vehicle's angleof inclination is
de tected whi letheto w- aw ay alar misarmed.
The tow- aw ay alar misaut omat icallyar med afte r
appr oximat ely60 seco nds:
R Afterloc king theve hicle withth eSmar tKey
R Afterloc king theve hicle using KEYLES S-GO
The tow- aw ay alar mison lyarmed when thefo l‐
lo wing compone ntsar eclos ed:
R Doo rs
R Trunk lid
The tow- aw ay alar misaut omat icallydeac tiva‐
te d:
R Afterpr essing theÜ or008B buttonon
th eSmar tKey
R Afterpr essing thest ar t/ stop butt onwithth e
Smar tKey inthestor ag ecom partmen t
(/ page12 7) R
Afterunloc kingtheve hicle using KEYLES S-
GO
R When usingHAND S-FREE ACCES S
In fo rm atio non collision detection onapa rked
ve hicle (/page15 0). Ar
min g/dis armin gthe tow- aw ay alar m Mul
timedi asy stem:
4 © 5
Set ting s5
Quick Access #
Arm or disar mTow-away Protection.
The tow- aw ay alar misarmed again inthefo llo w‐
ing cases :
R The vehicle isunloc kedag ain.
R Adoor isopened.
R The vehicle isloc kedag ain.
% Ifqu ick acc ess isuna vailable, selectth e
Vehicle submenu intheSet ting smain menu
to arm or disar mtheto w- aw ay alar m. Open
ingand closing 85

Ins
trum ent Disp lay
Fu nctio n/no tes ................................... 202
Ins trument cluster ...... ........................... 10
Wa rning/ indic ator lam ps................ .....3 79
Ins trument Displa yand on-b oard
co mp uter
Fu nctio n/no tes ...... ............................. 201
Int ellig entLight System
Ad aptiveHig hbeam Assis t.............. .....1 12
Cor nering light <0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> ............112
Int erior ligh ting........ ................................ 114
Ad jus ting ............ .................................. 114
Ambi entlighti ng<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011> ...............114
Re adin glam p.......................................1 14
Swi tch-of fdel aytim e........... ................115
Int erior motion sensor
Ac tivati ng/d eactiv ating ........... ..............86
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011> 86
In te rn et radio
see TuneIn
iP hon e®
see Sma rtphone integratio n J
Jac k
St or ag elocation .............................. ..... 310
Jum p-startconne ction ............................2 76
Gene ralno tes ...................................... 274 K
KEYLESS- GO
Loc kingth eve hicle ........................ ........ 70
Pr oblem .................................................7 1
Un loc kin gse tting ............................ .......6 7
Un loc kin gth eve hicle ............................7 0
Kic kdow n.................................................. 141
Using ................................................... 141
Knee airbag ................................................ 42 L
Label ing(tires)
see Tire labeling
Lam p
see Interior light ing
Lam ps(Ins trum ent Displa y)
see Warning/ indic ator lam ps Lane
detection (automatic )
se eAc tiveLa ne Keeping Assist
Lane Keeping Assist
see ActiveLa ne Keeping Assist
LA TC H-type (ISOFI X)child seat secur‐
ing system
In stallin g................................................ 56
Light switch
Ov ervie w ............................................. 109
Light ing
see Inte rior lighting
see Lights
Lights .......................................................1 09
Ad aptiveHig hbeam Assis t...................1 12
Au tomatic driving lights..... .................. 110
Comb inationswit ch<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011> 110
Cor nering light <0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011001100110011> .............112
Haza rdwa rning light s...........................1 11
High beam............ ...............................110
High -beamflasher ................................ 110
Light switch..... .................................... 109
Lo w-beam headlam ps.........................1 09
Pa rking light s.......................................1 09
Re ar foglam p...................................... 109 408
Index

Re
sponsibili tyforlig hting systems ...... 109
Se tting theex terior lighting switch-
of fdela ytime ....................................... 113
St andi nglight s................................ .....1 09
Switc hingthesur round lighting
on /of f.... .............................................. 113
Tu rn signal light.................................... 110
Limit edWa rranty
Ve hicle ............................................. ..... 30
Liv eTr af fic Inf orma tion
Swit ching thetra ffic inf ormatio ndis‐
pla yon ................................................ 225
Load index(tir es) .................................... 302
Load- bearingcapa city(tires) .................3 02
Lo ading .....................................................103
Car gotie-do wn rings <0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> ..103
Def initio ns ............ ...............................304
No tes ..................................................... 98
Ro oflugg agera ck <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011> 104
Load ingguid elines .................................... 98
Load inginforma tion table ...................... 295
Load s
Sec uring ...... .......................................... 98 Loc
king/u nlocking
Ac tivati ng/d eactiv ating theaut o‐
matic locking featur e.............................7 1
Emerg encykey ...................................... 72
KEYLESS- GO................................... .......70
Un loc kin g/op eningth edoor sfrom
th einside ..............................................7 0
Lo w-beam headla mps
Swi tching on/of f<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011> 109
Lu bricant additives
see Additiv es
Lu ggage
Sec uring ................................................ 98
Lu mbar support
se eLu mbar support(4-w ay)
Lu mbar support(4 -w ay)...........................9 1 M
Maint enanc e
Ve hicle ............................................. ...... 24
Maint enanc e
see ASSYSTPL US Malfunct
ion
Re stra int system .................................... 37
Malfunc tionmessag e
see Displa ymessa ge
Maneuv ering assis tance
Ac tivati ng/d eactiv ating ........... ............199
Cr oss Traf fic Aler t<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011001100110011> ....199
Dr ive Aw ayAssi st<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011> 198
Map ...........................................................2 25
Displ aying onlin emap contents .......... 225
Disp laying weather informat ion ...........2 25
Mo ving ................................................ 225
Selecti ngthemap orient ation .............2 25
Se tting themap scale .......................... 225
Switc hingfree wa yin fo rm atio n
on /of f.................................................2 25
Massag epr og ram
Re settin gth ese ttings ............................9 3
Massag epr og rams
Sel ecti ngthefront seats ....................... 93
Massag ese ttings
Re settin g............................................... 93
Matt efinish (cleaning instructions) ...... 260 Inde
x409

Tr
ans miss ionoutput (max imum ).... ...... 321 U
Un loc king setting .... .................................. 67
Up dat es
Im por tant system updat es...................2 18
USB port
Re ar passe nger com partment .............1 05 V
Ve hicl e...... ................................................ 127
Ac tivati ng/d eactiv ating standb y
mode ...... .............................................1 51
Collis iondetection (parking) .......... ...... 150
Cor rect use <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011> ..............28
Dat aacq uisiti on <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011> .......30
Dat ast or ag e ............ .............................. 30
Diagnos ticsconn ection .................. .......2 7
Eq uipme nt............ ................................. 23
Li mit edWarrant y...................................3 0
Loc king (automatical ly)..........................7 1
Loc king (from inside )..... .................... .... 70
Loc king (KEYLESS-GO) .................... ......7 0
Loc king/unloc king(emerg encykey) ...... 72 Lo
we ring <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011>316
Maint enance .......................................... 24
Medical aids.................................... ...... 28
Pa rking foran extende dpe riod ............ 150
Pr oblem notification ........................ ...... 29
QR code rescue card..................... ........ 30
Quali fied specialis two rkshop ................2 8
Ra ising .................................................3 12
St andb ymode function .................. ...... 151
St artin g(eme rgency operation
mode) .................................................. 127
St artin g(R emo teOnline) ............... ...... 128
St artin g(sta rt/s topbutt on) ............ .....1 26
Switc hingoff(s ta rt/s topbutt on) .... .... 144
To wing .................................................2 00
Un loc kin g(fr om insid e).................. .......7 0
Un loc kin g(KE YLE SS-GO) ................ .......7 0
Ve ntil ating (co nve nience openi ng) ......... 78
Ve hicl edata
Displ aying (DYN AMI CSE LECT) ...... ...... 136
Ro ofload ............................................. 331
Tu rning radius ...................................... 330
Ve hicle height ................................. ..... 330
Ve hicle length...................................... 330
Ve hicle width................................. ...... 330 Wheelbase
...........................................3 30
Ve hicl edata stor ag e
Ev ent data recor der s<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011001100110011> .34
MBUX multimedia system/Mer cedes
me connect ...........................................3 4
Ve hicl edimens ions...... ...........................330
Ve hicl eele ctroni cs
No tes .................................................. 320
Tw o-w ayradios .................................... 320
Ve hicl eiden tificati onnumber
see VIN
Ve hicl eiden tificati onplat e...... ..............322
Pa int code ...........................................3 22
VIN ...................................................... 322
Ve hicl eint erior
Coo ling orhea ting (Remo teOnline) ..... 128
Ve hicl eke y
see Smar tKey
Ve hicl emaint enance
see ASSYSTPL US
Ve hicl eoper ation
Outsi detheUS Aor Canada ...................2 4 420
Index