2021 MERCEDES-BENZ GT COUPE battery

Re
mo ving /ins ertin gthe eme rgency key #
Toremo ve:pu sh release catch1 inthe
dir ect ion ofthear row and simul taneou sly
pu lleme rgency key2 comp lete ly ou tof the
Smar tKey . #
Toinser t:push emergency key2 fullyin to
th eSmar tKey unt ilit en gage s.
Re lease catch1 mus tth en be bac kin the
basic position . 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 aCR202 53V cell battery.
Mer cedes-Ben zre comme ndsthat youha ve the
batt eryre placed ataqu alif ied spec ialistwo rk‐
shop. #
Remo vetheemer gency key(/ pag e52 ). 52
Opening and closing

#
Press emer gency key2 into theopening in
th eSmar tKey inthedir ect ion ofthear ro w
unt ilbat tery com partment cover1 opens.
When doingso,donothold batterycom part‐
ment cover1 shut. #
Remo vebatt erycom partmen tco ver1. #
Repeat edly taptheSmar tKey agains tyo ur
palm untilbat tery 3 falls out oftheSmar t‐
Ke y. #
Inser tth ene wbatt erywit hth epositiv epole
fa cing upwa rds. Use alint-fr eeclothtodo so. #
Mak esur eth at thesur face ofthebatt eryis
fr ee oflint, grease andother impur ities. #
Inser tth efront tabsof batt erycom partment
co ver1 intoth ehousing andthen press to
clos eit. #
Inser teme rgency key2 into theSmar tKey . Pr
oblems withtheSm artK ey 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
and replace ifnec essar y(/ page52). #
Use theemer gency keyto loc kor unloc k
(/ page52). #
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 asuf 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 53

#
Onlyuse batterych arge rs wit hamax i‐
mum chargin gvo ltag eof 14.8 V. When
chargin gth ebatt eryand during star tin g
assis tance, alwa ys use thejum p-start connec‐
tion pointintheengine compartmen t.
* NO
TEDama ging thebatt eryth ro ugh
ove rvolt age When
chargin gusin gabat tery charge rwit h‐
out amaximu mchargin gvo ltag e, thebatt ery
or theve hicle electr onics maybe damag ed. #
Onlyuse batterych arge rs wit hamax i‐
mum chargin gvo ltag eof 14.8 V. &
WARNIN GRisk ofexplosion during
ch argin gpr oce ssand star tin gassis tance
Dur ing thech argin gpr oce ssand star tin g
assis tance, thebatt eryma yre lease anexplo‐
siv ega smixtur e. #
Avoid fire ,open flames ,cr eat ing spar ks
and smoking. #
Mak esur eth er eis suf ficie ntventil a‐
tio n. #
Donotle an ove ra batt ery. &
WARNIN GRisk ofexplosion from afro‐
zen battery
A disc hargedbatt eryma yfreeze attemp era‐
tur es slightl yabo veorbelo wfreezing point.
Dur ing star tin gassis tance orbatter ych arg‐
ing ,bat tery gascan bereleased. #
Alw aysallo wabatt eryto thaw before
ch argin git or per form ing star tin gassis ‐
ta nce. If
th eindicat or/warning lampsintheins trument
clus terdo notlig ht up atlow temp eratur es,itis
ve ry likelyth at thedisc hargedbatt eryhas fro‐
zen .In this case youma yne ither jump-start the
ve hicle norcharge thebatt ery.
The service life of abatt eryth at has been
th awe dma ybe dramaticall yshor tened .The
st ar tin gch aract eristic sma ybe impair ed,espe ‐
ciall yat low temp eratur es. It
is recomme ndedthat youha ve ath aw ed bat‐
te ry checkedat aqu alif ied spec ialistwo rkshop.
* NO
TEDama gecau sed bynum erou sor
ex tende datt em ptsto star tth eengine Nu
me rous orextende datt em ptsto star tth e
engine maydamag eth ecat alytic converter
due tonon-co mbusted fuel. #
Avoid numer ousand extende datt em pts
to star tth eengine. Obser
vethefo llo wing pointsdur ing star tin g
assis tance and when chargin gth ebatt ery:
R Onlyuse undamag edjum per cables/c harg‐
ing cables withasuf ficie ntcross -secti onand
insu late dte rm inal clam ps.
R Non-insulat edpar tsof thete rm inal clam ps
mus tno tcom eint ocon tact with other metal
par tswhile thejum per cable/c harging cable
is con nect edtothebatt ery/jum p-start con‐
nectio npoi nt.
R The jumper cable/c harging cable mustno t
com eint ocon tactwi th anypar tswhic hma y
mo vewhen theengine isrunning . Br
ea kdo wnassist anc e283

R
Alw aysmak esur eth at nei ther youno rth e
batt eryis elect rostatic allych arge d.
R Keep away from fire and open flames .
R Donotlean overth ebatt ery.
R Take car eth at thepositiv ete rm inal ofacon ‐
nec tedbatt erydoes notcome intocon tact
wi th vehicle parts.
R Neverpla ceme talobje ctsor tools onabat‐
te ry.
R When connectin gand disconn ectingth ebat‐
te ry,alw aysobser vetheseq uence ofbatt ery
te rm inals described.
Obser vetheadditional follo wing pointswhen
ch argin gth ebatt ery:
R Onlyuse batterych arge rs tested and
appr ovedfo rMer cedes-Benz.
R Read thebatt erych arge r's oper ating instruc‐
tions beforech argin gth ebatt ery. Obser
vetheadditional follo wing pointsdur ing
st ar tin gassis tance:
R Startin gassis tance mayonly beprov ided
using vehicles, batteries orother jumpstar t
de vic es wit hano min alvoltag eof 12 V.
R The vehicles mustno tto uc h.
R Take car eto connect onlybatter yte rm inals
of ident icalpolar ity.
R Obser vetheseq uence describedforcon‐
necting anddisconnecting thejum per
cables.
R Vehicl eswith aga soline engine: Jump-
st ar tth eve hicle onlywhen theengine and
ex haus tsy stem arecold. St
arting assistance andchargin gth e12 V
batt ery Re
quirement s:
R The vehicle issecur edwithth eelectr icpar k‐
ing brak e.
R Vehicl eswith automatic transmiss ion:
The transmis sionisin posi tion 005D. R
The igniti onand allele ctrical consumer sar e
swi tched off.
R The hood isopen. Ex
am ple:engine compartment #
Slid eco ver1 ofposi tiveclam p2 onthe
jum p-starting con nection point inthedir ec‐
tion ofthear row . 28
4
Breakdo wnassis tance

#
Con nect posi tiveclam p2 onyour vehicle to
th epositiv epole ofthedonor batteryusing
th ejum per cable/c harging cable. Always
begin withpositiv eclam p2 onyour ow n
ve hicle firs t. #
During star ting assistance :st ar tth e
engine ofthedonor vehicle andrunat idle
spe ed. #
Connect theneg ativepole ofthedonor bat‐
te ry and grou nd point 3 ofyour ow nve hicle
by usin gth ejum per cable/c harging cable.
Begin withth edonor batteryfirs t. #
During star ting assistance :st ar tth e
engine ofyour ow nve hicle. #
Dur ing thech argin gpr oc ess :st ar tth e
ch argin gpr oce ss. #
Dur ing star ting assistance :le tth eengines
ru nfo rse veralmin utes. #
Dur ing star ting assistance :bef oredis con‐
necting thejum per cable, switchon anelec‐
tr ical consumer inyour ow nve hicle, e.g.the
re ar wind owheat eror lighting. When
thest ar tin gassis tance/c harging proce ss
is com plet e, per form thefo llo wing steps: #
First,re mo vethejum per cable/c harging
cable from ground point 3and theneg ative
pole ofthedonor battery, then from positiv e
clam p2 and thepositiv epole ofthedonor
batt ery. Begi nea ch tim ewi th thecon tacts
on your ow nve hicle firs t. #
Afterre mo ving thejum per cable/c harging
cable, closecover1 ofposi tiveclam p2.
Fu rther information canbeobt ained ataqu ali‐
fi ed specialis two rkshop. Re
plac ingthe 12Vbatt ery #
Obs erve theno teson the12 Vbatt ery
(/ page28 1).
Mer cedes-Benz recomme ndsthat youha ve the
12 Vbatt eryre placed ataqu alif ied spec ialist
wo rkshop, e.g.atan aut hor ized Mercedes-Benz
Cent er. If
yo uwa nttoreplace thebatt eryyo urself ,
obse rveth efo llo wing notes:
R Replace afa ulty battery wit habatt erywhic h
mee tsthespecif icvehicle requ iremen ts.
The vehicle iseq uipped withalit hium-ion
batt ery. Fu llve hicle functionality isonl yguar‐
ant eed withalit hium-ion battery. Fo rsaf ety
re ason s,Mer cedes-Ben zre comme ndsthat
yo uon lyuse batteries whic hha ve been tes‐
te dand appr ovedfo ryo ur vehicle by
Mer cedes-Ben z.
R Use detach able partssuc has vent hos es,
el bo wfitting sor term inal covers from the
batt erywhic his to be replaced.
R Mak esur eth at theve nt hos eis alwa ys con‐
nect edtotheor iginal opening ontheside of
th ebatt ery.
Ins tallan yex istin gor supplied cellcaps.
Ot her wise, gases orbatt eryacid could
escape.
R Mak esur eth at detach able partsarere con‐
nect edinthesame way. Br
ea kdo wnassista nce 28
5

Smar
tKey Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
00AF Obtain aNew Key *T
heSmar tKey nee dstobe replaced. #
Consult aqu alif ied spec ialistwo rkshop.
00AF Repla ceKey Battery *T
heSmar tKey batt eryis disc harged. #
Replace thebatt ery(/ page52).
00AF Key NotDetected(whit e
displa ymessag e) *T
heSmar tKey iscur rentl yund etect ed. #
Chang eth elocation oftheSmar tKey intheve hicle. #
Ifth eSmar tKey isstill no tre cogni zed,star tth eve hicle withth eSmar tKey (/ pag e95). Displa
ymessag esand warning/ indic ator lam ps 33
7

Disp
laymes sages
Possible causes/conseq uencesand0050 0050
Solutions
St op Vehicle LeaveEngine
Running WaitTransmission
Cooling *T
hetransmission isove rheating. Pullingaway ma ybe temp orarily im pair edornotpossible. #
Stop theve hicle immediat elyinaccor dance withth etraf fic condi tions.Do notcontinu edr ivi ng. #
Lea vetheengine running . #
Waitunt ilth edispla ymessag edisappear sbef orepulling away.
0080 Transmission OilCooling
Malfunction *T
hetransmission's coolantpumpis faulty .The transm issionmayove rheat. #
Select thePerform ancemenu intheon- board computerand checkth etransmission oiltemp eratur e. #
Avoid ahigh load withadynamic driving style. #
Iftra nsmiss ionoiltemp eratur esarebelo w24 8°F (120 °C) ,dr ive on tothenear estqu alif ied spec ialistwo rk‐
shop.
0080
Transmission OilOverhea-
ted Drive withCaution *T
ransmi ssion positio nM and thete mp orarymanual driving progr am areno long eravailable. Theengineoutput is
re duced dependin gon theove rheating. #
Letth etransmission oilcool down bydriving defensiv elyuntil thedispla ymessag edisappear s.
Auxiliary BatteryMalfunc-
tion *T
heauxilia rybatt eryfo rth etra nsmiss ionisno long erbeing charge d. #
Consult aqu alif ied spec ialistwo rkshop. #
Untilthen, alwaysselect parkposition 005Dmanually beforeyo uswit choffth eengine. #
Beforelea ving theve hicle, apply theelectr icpar king brak e. 350
Displa ymessag esand warning/ indic ator lam ps

1,
2, 3...
12 Vbatt ery
see Battery(v ehi cle)
12 Vso cket
see Socket(1 2 V) A
A/ Cfun ction
Swi tching on/o ff(con trol panel) ...........9 0
ABS (Anti-lockBr ak ing System) .............1 21
Ac celer ation
see Kickdo wn
Ac ciden tand Break down Manag e‐
men t
Mer cedesme connect.........................2 32
Ac ous ticlocking verificat ion signa l
Ac tivati ng/d eactiv ating ........... ..............51
Ac tiv atin g/deac tivatin gaut omati c
vo lum eadj ustm ent
Bur mes ter®
sur round soun dsy stem ...259
Ac tiv eBr ak eAs sist
Fu nctio n/no tes .................................... 124 Se
tting <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
0011> 126
Ac tiv eDi stance AssistDI ST RO NIC ........ 128
Callin gup aspee d...............................1 31
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011>128
Incr easi ng/decr easingspeed ......... .....1 31
Re quiremen ts................................ ...... 131
St eer ing wheel buttons .................. ...... 131
St or ing aspeed .............................. ...... 131
Swi tching off/de activating ........... .......131
Swi tching on/a ctivating <0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011> 131
Sy stem limit ations ........................... ....1 28
Ac tiv eSe rvice System PLUS
see ASSYST PLUS
Ad aptiv e
see Lane Keeping Assist
Ad aptiv ecr uise contr ol
see ActiveDis tance AssistDIS TRONI C
Ad aptiv eHighb eamAssist
Fu nctio n<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011> <0011001100110011001100110011001100110011001100110011001100110011
001100110011001100110011>82
Swi tching on/o ff<0011001100110011001100110011001100110011001100110011001100110011
0011001100110011001100110011001100110011001100110011001100110011
001100110011> 83
Ad diti ves.................................................. 327
En gine oil............................................. 327
Fu el ..................................................... 326 Ad
diti ves(engine oil)
see Additiv es
Ad diti ves(fuel)
see Fuel
Ad dres sbo ok
see Contacts
Ad jus tingthe balanc e
Bur mes ter®
high-end Surround
soun dsy stem ...................................... 260
Bur mes ter®
sur round soun dsy stem ...259
Ad jus tingthe bass,mid- rang eand
tr eble
Bur mes ter®
high-end Surround
soun dsy stem ...................................... 260
Bur mes ter®
sur round soun dsy stem ...259
Ad jus tingthe mid- rang e,treble and
bass
Burmes ter®
high-end Surround
soun dsy stem ...................................... 260
Bur mes ter®
sur round soun dsy stem ...259
Ad jus tingthe sound optimi zation
Bur mes ter®
high-end Surround
soun dsy stem ...................................... 260 388
Index