lock MERCEDES-BENZ A-CLASS SEDAN 2021 Service Manual

When
your vehicle isthen towe daw ay,signif ‐
icant lymor eef fort ma ybe requ ired tosteer
and brak eth an isno rm allyre qu ired. #
Use ato w bar . #
Mak esur eth at thesteer ing wheel can
mo vefreely beforeto wing theve hicle
aw ay. *
NO
TEDama gedue toexcess ive tracti ve
po we r If
yo upull away shar ply, thetractiv epo we r
ma ybe toohigh andtheve hicles couldbe
damag ed. #
Pull away slo wlyand smoo thly. Lo
adi ng the vehicl efo rtr ans port #
Obser vetheno teson towing away
( / pag e27 9). #
Con nect theto w bar totheto wing eyein
or der toload theve hicle. #
Vehicl eswith automatic transmiss ion:
Shif tth eaut omatic transmiss iontoposition
005C.
% Ve
hicl eswith automatic transmiss ion:
The automatic transmiss ionmaybe locked
in posit ion005Dintheeve ntofdama getothe
electr icalsystem. Toshif tto 005C ,pr ov ide the
on-boar delectr icalsystem withpo we r
( / pag e27 6). #
Load theve hicle ontoth etra nspor ter. #
Vehicl eswith automatic transmiss ion:
Shif tth eaut omatic transmiss iontoposition
005D. #
Use theelectr icpar king brak eto secur eth e
ve hicle agains tro lling away. #
Onlysecur eth eve hicle bythewheels. Ve
hicl eswith adaptivedam ping adjus tment &
WARNIN GRisk ofan acci dent when
tr ansp orting vehicles withadap tive
dam ping adjus tment
When transpor tingvehicles withadap tive
dam ping adjus tment ,th eve hicle/tr ailer
combination maybegin torock and star tto
skid. #
Load theve hicle correctl yont oth e
tr ans porter . #
Secur eth eve hicle onallfour wheel s
wit hsuit able tensi oni ng stra ps. #
Donotexc eed themaximum permissi‐
ble speed of35 mph(6 0km/h) when
tr anspo rting. *
NO
TEDama getotheve hicle from secur‐
ing itincor rectl y #
Afterloa ding, theve hicle mustbe
secur edon allfour wheel s.Ot her wise,
th eve hicle could bedamag ed. Br
eakdo wnassis tance 28
1

#
Position suppor t2 ofjac k4 onjacksup‐
por tpoint 1.
% Ifth er eis atot alloss ofpressur ein atir e, it
ma ybe poss iblethat thejac kcann otbe
position edatjac ksuppor tpoint 1.Inthis
case, unload theve hicle. #
Turn ratche t3 clockwise untilsuppor t2
sit scom pletely on jacksuppor tpoint 1and th
ebase ofthejac klies evenlyon the
gr ou nd . #
Turn ratche t3 unti lth etir eis raised amaxi‐
mum of1.2 in (3 cm) from thegr ound. #
Loosen andremo vethewheel (/page31 4). Re
mo ving awh eel Re
quirement s:
R The vehicle israised (/page31 2).
* NO
TEMer cedes-AMG vehicles #
Obser vetheno tesin theSupplement .
Yo uco uld other wise failto recogni ze
da ngers. Whe
nch ang ingawheel, avoidapplyin gan yfo rc e
to thebr ak ediscs, asthis could impair theleve l
of comf ortwhen braking. *
NO
TEDama getothre adin gfrom dirton
wheel bolts #
Donotplace wheel boltsin san dor on
a dir tysur face. #
Unscr ew theupper mostwheel boltcom‐
ple tely. #
Screw align mentbolt 1intoth eth re ad
ins tead ofthewheel bolt. #
Unscr ew there maini ngwhee lbolts com‐
ple tely. 31
4
Wheels andtires

*
NO
TEBlocked spr aynozzl escau sed by
mixing windshieldwa sher fluids #
Donotmix MBSum merFitand MBWin‐
te rFit withot her windshield washer flu‐
ids. Do
notuse distilled orde- ionizedwa ter.Ot her‐
wise, thefill le ve lsen sor maybe trigg ered erro ‐
neou sly.
Re comme ndedwindsh ield wa sher fluid:
R Abo vefreezing point:e.g. MBSummerFi t
R Belo wfreezing point:e.g. MBWinterFi t
Fo rth ecor rect mixi ngratio ,re ferto theinf orma‐
tion ontheantif reeze container .
Mix washer fluid withwind shieldwa sher fluid all
ye ar round . Re
frig er ant No
teson refrig er ant
Obser vetheno teson oper ating fluids
(/ page32 3). *
NO
TEDama gedue toinc orrect refrig er‐
ant If
anon-appr ovedre frig er ant isuse d,thecli‐
mat econ trol system maybe damag ed. #
USA/China: UseonlyR‑1 34a refrig er‐
ant. #
Canada: UseonlyR‑1 234yf refrig er ant. *
NO
TEDama getotheclimat econ trol
sy stem due toinc orrect refrig er ant com‐
pr essor oil #
Onlyuse refrig er ant com pressor oilthat
has been approvedby Mer cedes-Ben z. #
Donotmix theappr ovedre frig er ant
com pressor oilwithadif fere nt refrig er‐
ant com pressor oil. Wo
rkon theclimat econ trol system maybe car‐
ri ed out onlyby aqu alif ied spec ialistwo rkshop.
All appli cable regulations, aswellas SAEstand‐
ar dJ63 9,mus tbe adher edto.
The information labelforth eclimat econ trol sys‐
te m rega rding there frig er ant type andthere frig‐ er
ant com pressor oil(PAG oil) islocat edon the
insid eof thehood. Inf
ormation label(exa mp le–US A/China)
1 Hazardand service warning symbols
2 Refrig er ant filling capac ity
3 Applic ablestandar ds
4 PAGoil par tnum ber
5 GWP(global warming potentia l)of there frig‐
er ant used
6 Refrig er ant type Te
ch nica lda ta 329

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
Á Key NotDetected (red dis‐
pla ymessag e) *T
heSmar tKey canno tbe detected and mayno long erbe intheve hicle.
The Smar tKey isno long erintheve hicle andyouswit choffth eengine:
R Youcan nolongerst ar tth eengine.
R Youcan notcen trally lockth eve hicle. #
Ensur eth at theSmar tKey isin theve hicle.
If th eSmar tKey detection functi onhasa mal functi ondueto ast ro ng radio signal source: #
Stop theve hicle immediat elyinaccor dance withth etraf fic condi tions. #
PlacetheSmar tKey inthemar kedspace forst ar tin gth eengine withth eSmar tKey (/ pag e12 7).
Á
Don't ForgetYour Key *A
warning tone also sou nds. Thismes sage reminds youto take your Sm artK ey wit hyo uwhen youlea vetheve hicle.
Place theKey inthe
Marked SpaceSeeOpera-
tor's Manual *S
mar tKey detection ismal functi oning. #
Chang eth elocation oftheSmar tKey intheve hicle. #
Place theSmar tKey inthemar kedspace forst ar tin gth eengine withth eSmar tKey (/ pag e12 7). Dis
play messa gesand warning/ indic ator lam ps 33
7

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions #
Pull overand stop theve hicle safely assoon aspossible, paying attention toroad and traf fic condi tions.
Do notcontinu edr ivi ng und eranycir cums tances. #
Consu ltaqu alif ied spec ialistwo rkshop. Ù
Steering Malfunction See
Operator's Manual *T
heelectr icsteer ing lockis malfunct ioning.Thesteer ing maybe lockedby theelectr icsteer ing lock. &
WARNIN GRisk ofacci dent ifsteer ing capability isim pair ed
If th esteer ing does notfunc tion asintended, theve hicle's operating safetyis jeopar dized. #
Pull overand stop theve hicle safely assoon aspossible, paying attention toroad and traf fic condi tions.
Do notcontinu edr ivi ng und eranycir cums tances. #
Consu ltaqu alif ied spec ialistwo rkshop. #
Pull overand stop theve hicle safely assoon aspossible inaccor dance withth etra ffic con dition s.Do notcon ‐
tin ue drivin gunder anycir cums tances. #
Consu ltaqu alif ied spec ialistwo rkshop.
û Before Startingthe Engine,
Turn Steering Wheel *T
heelectr icsteer ing lockcould notunloc kth esteer ing. #
Switc hof fth eignition . #
Tounlo ckthesteer ing, movethesteer ing wheel slightlyto thelef tand right. #
Switc hth eignition backon. 34
2
Dis play messa gesand warning/ indic ator lam ps

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
0051 *A
tle as tone door isop en. #
Close alldo ors.
0083 *T
hehood isopen. &
WARNIN GRisk ofacci dent dueto driving withth ehood unlocked
The hood mayopen andblockyo ur vie w. #
Neverre lease thehood when driving. #
Beforeev erytrip, ensur eth at thehood isloc ked. #
Stop theve hicle immediat ely,pa ying attention toroad and traf fic condi tions. #
Close thehood.
0084 *T
hetrunk lidisopen. &
DANG ER Risk ofexhaus tga spoisoning
Combus tionengines emitpoisonous exhaus tga ses suchas carbon monoxide.Exhaus tga ses can enterthe
ve hicle interior ifth etrunk lidisopen when theengine isrunning ,esp ecially ifth eve hicle isin mo tion. #
Alw aysswitc hof fth eengine beforeopening thetrunk lid. #
Neverdr ive wit hth etrunk lidopen. Displa
ymessag esand warning/ indic ator lam ps 34
3

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
0080 Transmission OilOverhea-
ted Drive withCaution *T
hetransmission isove rheating. Whenthedispla ymessag eis activ e,star t-up and drivin gch aract eristic sma ybe
te mp orarily im pair ed. #
Drive at low engine speed. #
Avoid spor tydriving. #
Beforepulling away on uphill gradients, letth etra nsmiss ioncool down until thedispla ymessag edisappear s.
Parkin gLock Inoper ative
Apply Parkin gBrak e *
The transmiss ionismalfunct ioning.Theparkposition 005Dcann otbe select ed. #
Park theve hicle safely. #
Use theelectr icpar king brak eto secur eth eve hicle agains tro lling away.
Teaching inTransmission
Operate SelectorLever
Apply Brake forXXsRisk
of Vehicle RollingAway *T
hetransmission isbeing taught in.Ther eis arisk oftheve hicle rolling away. #
Dep ress and hold thebr ak epedal untilthete ac h-in proce sshas been completed.
The elect ric pa rking brak eis applied automat icallydur ing thete ac h-in proce ss. #
Swit chon theignition . #
Select parkposition 005D,transmiss ionposition 005Eorneutr al005C.
Apply Parkin gBrak eRisk
of Rolling AwaySeeOpera-
tor' sManual *T
hetransmission positioncannotbe reliably identified. #
Use theelectr icpar king brak eto secur eth eve hicle agains tro lling away.
Teaching inTransmission
Complete *T
hetransmission's teac h-in proce ssiscom plete.All trans mis sionpos itions canbeselect edagain. Disp
lay mes sage sand warning/ indic ator lam ps 34
9

1,
2, 3...
4MA TIC...................................................... 141
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011> 141
12 Vbatt ery
see Battery(v ehi cle)
12 Vso cket
see Socket(1 2 V)
36 0° Camer a........... ................................ 187
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011>187
Opening thecamer aco ver(r ear view
camer a)..... .......... ........... ..................... 189
Sel ecting avie w <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
001100110011> 189 A
A/C funct ion
Ac tivati ng/d eactiv ating (MBUX mul‐
tim ediasystem) .............................. ..... 122
Swi tching on/of f(contr olpa nel ).......... 121
ABS (Anti-lockBr ak ing System) .............1 53
Ac celer ation
see Kickdo wn Ac
ciden tand Break down Manag e‐
men t
Mer cedesme connect.................... .....2 31
Ac ous ticlocking verificat ion signa l
Ac tivati ng/d eactiv ating ........... ..............67
Ac tiv eBli nd Spo tAs sist <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011> 180
Br ak eap plica tion <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011> .............181
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011>180
Sy stem limit ations ........................... ....1 80
Ac tiv eBr ak eAs sist
Fu nctio n/no tes .................................... 173
Se tting <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011> 177
Ac tiv eDi stance AssistDI ST RO NIC ........ 162
Ac tiveEmerg encyStop Assis t.............1 70
Ac tiveLa ne Chang eAssi st<0011001100110011001100110011001100110011001100110011001100110011
001100110011> 171
Callin gup aspee d...............................1 64
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011>162
Incr easi ng/decr easingspeed ......... .....1 64
Re quiremen ts................................ ...... 164
Ro ute-based speedadap tatio n........... .167
St eer ing wheel buttons ........................ 164
St or ing aspeed .............................. ..... 164
Swi tching off/de activating ........... .......164
Swi tching on/a ctivating <0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011> 164 Sy
stem limit ations ...............................1 62
Ac tiv eEme rgency Stop Assis t...............1 70
Ac tiv eLan eCha ngeAs sist <0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011> 171
Ac tivati ng/d eactiv ating ........... ............172
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011>171
Ac tiv eLan eKe eping Assist.................... 182
Ac tivati ng/d eactiv ating ........... ............184
Ac tivati ng/d eactiv ating thewa rning .... 184
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011>182
Se tting thesensit ivity.......................... 184
Sy stem limits ....................................... 182
Ac tiv ePa rking Assis t.............................. 194
Exiti ngapa rking space ........................ 197
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011>194
Pa rking ................................................ 196
Sy stem limit ations ...............................1 94
Ac tiv eSe rvice System PLUS
see ASSYST PLUS
Ac tiv eSpe edLimit Assist <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011> 166
Dis play <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011> 166
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011>166
Ac tiv eSte ering Assis t.............................1 68
Ac tivati ng/d eactiv ating ........... ............170 39
4
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De
vic eDe tected atDia gnos ticsCon‐
nectio nSee Operator's Manua l...... ..... 369
Dr iver's Door Open &Trans miss ion
No tin PRisk ofVehicle Rolling Away ... 347
Fr ont Passeng erAirbag Disabled See
Oper ator's Manual ...............................3 34
Fr ont Passeng erAirbag Enabled See
Oper ator's Manual ...............................3 34
Hazard Warning Flashe rsMalfunc‐
tioning .................................................3 40
N Pe rm anen tly Ac tiveRi sk ofRo lling
Aw ay <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011> 347
Only Shiftto 'P' when Vehicle isSta‐
tio nar y.................................................3 46
Pa rking Assistand PARK TRONI C
In operativ eSe eOperat or'sMan ual.....3 64
Pa rking LockIno per ativ eAppl yPa rk‐
ing Brak e.............................................3 49
Pla cetheKe yin theMar kedSpace
See Oper ator's Manual ........................ 337 PRE-S
AFEInoper ativeSee Oper a‐
to r's Manua l...... .................................. 335
Re versing NotPo ssible Service
Re quired .............................................. 348
Ru nFla tIndi catorInop erati ve .............. 376
Ser vice Required Do NotShif tGear s
Vi sit Dealer .......................................... 348
Te ac hin gin Trans miss ionCom plete .... 349
Te ac hin gin Trans miss ionOper ate
Sel ectorLeverAppl yBr ak efo rXX s
Ris kof Vehicle Rolling Away ................ 349
Ti re Press. Monit orCur rently
Un available .......................................... 372
Ti re Press. Monit orInopera tive ............ 372
Ti re Pressur eMonit orInopera tiveNo
Wheel Sensors .....................................3 72
Ti re sOv erheat ed................................. 374
To Dese lect Por N, Dep ress Brak e
and StartEn gin e.................................. 347 To
switc hengine off,pr ess and hold
St art/ Stop butt onforat lea st3sec‐
onds orpress 3times. ........................344
Tr af fic Sign AssistCur rently Unavail‐
able SeeOperat or'sMan ual................ 360
Tr af fic Sign AssistInoper ative.... .........3 60
Tr ans miss ionMalfun ction .................... 348
Tr ans miss ionMalfun ction Service
Re quired .............................................. 350
Tr ans miss ionMalfun ction Stop ........... 348
Displa yon thewindsh ield
see Head- upDis play
Dis tance control
see ActiveDis tance AssistDIS TRONI C
DI ST RO NIC
see ActiveDis tance AssistDIS TRONI C
Do or
Ch ild sa fety lock (rear door s)................ 63
Loc king(emer gency key) .......................7 2
Opening (from inside) ............................7 0
Un loc kin g(emer gency key) .................... 72
Un loc kin g(fr om insid e).........................7 0 Inde
x403

Door
controlpan el.....................................1 6
DO T,Tire Iden tificat ionNumbe r(TI N) ... 300
Dr aw bar
see Tow- bar system
Dr inking anddriving ................................ 129
Dr ive Awa yAssis t.... ................................ 198
Dr ive Awa yAssis t
see Protect ion agains tcollision
Dr ive position
Inser ting..............................................1 39
Dr ive pr og ram dis pla y........... ..................135
Dr ive pr og rams
se eDY NA MIC SELE CT
Dr iver's seat
see Seat
Dr iving safetysy stem .............................. 151
ABS (Anti-lock Braki ng System) ........... 153
Ac tiveBr ak eAssi st<0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011001100110011001100110011001100110011> 173
BA S(Br akeAssi stSystem) .................. 153
Cameras .............................................. 152
EBD (electr oni cbr ak efo rc edis tribu‐
tion )..................... ................................ 155 ESP
®
Cr oss wind Assi st<0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011001100110011> 155
Ov ervie w .......................................... ... 152
Ra dar and ultrasonic sensors........ ...... 152
Re sponsibili ty....................................... 151
ST EER CONTR OL............. ....................156
Dr ivin gsy stem
Susp ension withadap tivedam ping
adjus tment .......................................... 184
Dr ivin gsy stem
see 360° Camer a
see ActiveBli nd Spo tAssi st
see ActiveDis tance AssistDIS TRONI C
see ActiveEmerg encyStop Assis t
see ActiveLa ne Chang eAssi st
see ActiveLa ne Keeping Assist
see ActivePa rking Assist
see ActiveSpe edLimi tAssi st
see ActiveSt eer ing Assis t
see ATTENTION ASSIST
see Blind SpotAssis t
see Cruise control
see Driving safetysy stem
see HOLD function
see Parking AssistPA RK TRONI C
see Rear vie wcam era see
Start-of fassis t
see Traf fic Sign Assist
Dr ivin gtips
Dr ink ing and drivin g............................ 129
Gene raldr ivin gtips .............................1 29
No teson breaking-in ane wvehicle ..... 129
Dr ow siness detection
see ATTENTION ASSIST
Dynamic handlingcontrolsystem
see ESP®
(Ele ctro nic Stabilit yPr og ram)
DY NA MIC SELECT .................................... 134
Con figur ing drive pr ogr am I... .............. 136
Dis play ing engin edat a........................ 136
Dis play ing vehicle data........................ 136
Dr ive pr og ram disp lay ..... .....................1 35
Dr ive pr ogr ams ....................................134
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
00110011001100110011>134
Oper ating (DYN AMIC SELECTswitc h)
... ..........................................................1 35
Selecti ngthedr ive pr ogr am ................1 35
DY NA MIC SELECT switch
Dam ping adjustment ........................... 184 40
4
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