battery MERCEDES-BENZ E-CLASS CABRIOLET 2021 Owners Manual

Climat
Climat
e contr
e contr ol
ol...........................................1 42
142
Overview of climate control systems ............ 142
Operating the climate control system .......... 143 Dr
Dr
iving and par
iving and par king
king..................................... 153 153
Driving ........................................................1 53
DY NAMIC SELECT switch ........................... .165
Au tomatic transmission .............................. .167
Fu nction of the 4MATIC ...............................1 71
Re fuelling .................................................... 171
Pa rking .......................................................1 77
Driving and driving saf ety sy stems ............... 183
Tr ailer hitch ................................................ .239
Bicycle rack function ................................... 244
Ve hicle towing instructions .......................... 245 Ins
Ins
tr
trument displa
ument displa y and on-boar
y and on-boar d com-
d com-
put
put er
er........................................................... 247 247
No tes on the inst rument display and on-
board computer .......................................... 247
Overview of instrument display .................... 248
Overview of buttons on the steering wheel ... 249
Operating the on-board computer ................2 49Overview of displa
yson the inst rument
display ........................................................ 251
Head-up display .......................................... 251 MBUX multimedia syst MBUX multimedia syst
em
em........................... .254
254
Overview and operation ............................... 254
System settings .......................................... 262
Na vigation .................................................. .266
Te lephone ................................................... 274
Mercedes me app ....................................... 277
Mercedes-Benz emer gency call system ....... 286
Ra dio, media & TV....................................... 290
Sound settings ............................................ 296 Maint Maint
enance and car
enance and car e
e................................. 298 298
ASS YST PLUS service inter val display .......... 298
Engine compartment ................................... 299
Cleaning and care ....................................... 305 Br Br
eakdo
eakdo wn assist
wn assist ance
ance................................. 315 315
Emer gency .................................................. 315
Flat tyre ...................................................... 317
Battery (vehicle) .......................................... 322 To
w- starting or towing away ........................ 328
Electrical fuses ............................................ 332 Wheels and tyr Wheels and tyr
es
es........................................ .336
336
No tes on noise or unusual handling char-
acteristics ................................................... 336
No tes on regula rly inspecting wheels and
tyres .......................................................... .336
No tes on snow chains ................................. 336
Ty re pressure .............................................. 337
Wheel change ............................................. 341
Emer gency spa rewheel .............................. .351 T T
ec
ec hnical dat
hnical dat a
a............................................. 353 353
No tes on tech nical data .............................. 353
On-board electronics ................................... 353
Re gula tory radio identi/cation and no tes ..... 355
Ve hicle identi/cation plate, VIN and
engine number overview .............................. 356
Operating 0uids ...........................................3 58
Ve hicle data ................................................ 367
Tr ailer hitch ................................................ .368 Contents
3 3

&
W
WARNI NG
ARNI NGRisk of accident due tocon-
necting devices tothe diagnostics con-
nection
If yo u connect devices tothe diagnostics con-
nection of theve hicle, the function of vehicle
systems and operating saf ety may be
impaired. #
For saf etyre asons, werecommend that
yo u only use and connect products
appr ovedby yo ur Mercedes-Benz service
centre. &
W
WARNING
ARNING Risk of accident due toobjects
in the driver's foot we ll
Objects in the driver's foot we ll may impede
pedal tr avel or block a depressed pedal.
This jeopardises the operating and road saf ety
of theve hicle. #
Stow all objects in theve hicle securely
so that they cannot getinto the driver's
fo ot we ll. #
Always /t the 0oor mats securely and as
prescribed in order toensure that there
is alw ays su1cient room forth e pedals. #
Do not use loose 0oor mats and do not
place 0oor mats on top of one ano ther. *
N
NOOTE
TE Battery discharging from using devi-
ces connected tothe diagnostics connec-
tion Using devices at
the diagnostics connection
drains the batter y. #
Check thech arge leve l of the batter y. #
Ifth ech arge leve l is lo w,charge the bat-
te ry, e.g. bydriving a considerable dis-
ta nce. Please also no
tethe information about the 12 V
battery and short-dis tance trips in the "Driving
and Parking" chap ter (/ page 158). Connecting and using ano
ther device with the
diagnostics connection can ha vethefo llowing
e.ects:
R malfunctions in theve hicle system
R permanent damage tovehicle components
Please referto thewa rranty term s and conditions
fo rth is matter. 32
32
General no
tes

R
ambient conditions, such as temp erature, rain
sensor or distance sensor
Generall y,the use of these data is temp orar y;
th ey will not be stored be yond the period of oper-
ation and will only be processed within theve hicle
itself. Control units oTen contain data memories
fo rve hicle keys,fo rex ample. Their use permits
th ete mp orary or permanent documentation of
te ch nical information about theve hicle's operat-
ing state, component loads, main tenance requ ire-
ments and tech nical events or faults.
Depending on theve hicle equipment, thefo llo w-
ing data are stored:
R operating status of system components, such
as /ll le vels, tyre pressure or battery status
R malfunctions or faults in impor tant system
components, such as lights or brakes
R system reactions in special driving situations,
such as airbag depl oyment or the inter vention
of stability cont rol systems
R information on events leading tovehicle dam-
age In cer
tain cases, it may be requ ired tostore da ta
th at wo uld ha veotherwise been used only temp o-
rari ly. This may be the case if theve hicle has
de tected a malfunction, forex ample.
If yo u use services, such as repair services and
maintenance work, stored operational data as
we ll as theve hicle identi/cation number can be
re ad out and used. They can be read out by
service network emplo yees, such as workshops
and manu facturers or third parties, such as break-
down services. The same is true in the case of
wa rranty claims and quality assurance measures.
In general, there adout is per form ed via the legally
prescribed port forth e diagnostics connection in
th eve hicle. The operational data that are read out
document tech nical states of theve hicle or of
individual components and assist in the diagnosis
of malfunctions, compliance with warranty obli ga-
tions and quality impro vement. Tothat end, these
data, in particular information about component
loads, tech nical events, malfunctions and other
fa ults may be transmitted along with theve hicle
identi/cation number tothe manufacturer. Fur-
th ermore, the manufacturer is subject toproduct
liability. Forth is reason the manufacturer also uses operational data from
theve hicle, forex am-
ple, forre calls. These data can also be used to
ex amine the customer's warranty and guarantee
claims.
Fa ult memories in theve hicle can be reset by a
service outl etor at your requ est as part of repair
or maintenance work.
Conv
Conv enience and inf ot
enience and inf otainment functions ainment functions
Yo u can store con venience settings and individual
settings in theve hicle and change or reset them
at any time.
Depending on theve hicle equipment, this
includes thefo llowing settings, forex ample:
R seat and steering wheel positions
R suspension and climate cont rol settings
R individual settings, such as interior lighting
Depending on the selected equipment, you can
import data into vehicle inf otainment functions
yo urself. 36 36
General no
tes

K
K
e
ey
y Ov
Ov
er
ervie
vie w of ke
w of key functions
y functions &
W
WARNING
ARNING Risk of accident and inju rydue
to leaving children unattended in theve hi-
cle
If ch ildren are leT unattended in theve hicle,
th ey could, in particular:
R open doors, thereby endangering other
persons or road users.
R get out and be struck byoncoming tra1c.
R operate vehicle equipment and become
trapped, forex ample.
In addition, thech ildren could also set the
ve hicle in motion by,fo rex ample:
R releasing the parking brake.
R changing the transmission position.
R starting theve hicle. #
Never lea vechildren unattended in the
ve hicle. #
When leaving theve hicle, alw aysta ke the
ke y with you and lock theve hicle. #
Keep theve hicle key out of there ach of
ch ildren. *
N
NOOTE
TE Damage totheke y caused bymag-
netic /elds #
Keep theke yaw ay from strong magnetic
/elds. Ve
hicle key
1 Locks
2 Indicator lamp 3
Unloc ks
4 Opens the boot lid
% If indicator lamp 2does not light up aTer
pressing theÜ orß button, the battery
is we ak or possibly dischar ged. Re place the
battery as soon as possible.
Re place theke y battery (/ page 76).
The key loc ksand unloc ksthefo llowing compo-
nents:
R Doors
R Fuel /ller 0ap
R Boot lid
If th eve hicle is not opened within appr oximately
40 seconds aTer unlocking, it loc ksagain. Anti-
th eT pr otection is primed again.
Do not keep theke yto get her with elect ronic devi-
ces or me tal objects. This can a.ect theke y's
functionalit y. 74 74
Opening and closing

R
R
emo
emo ving/inser
ving/inser ting t
ting the emerg
he emerg encykey
ency key R R
emo emo ving t
ving t he emerg
he emerg encykey
ency key #
Press release button 1.
Emer gency key2 is pushed out slightl y.#
Pull out eme rgency key2 until it en gage s in
th e intermediate position. #
Press release button 1again and fully
re mo veemer gency key2.
Inser
Inser ting t
ting t he emerg
he emerg encykey
ency key #
Press release button 1. #
Insert emer gency key2 tothe intermediate
position or fully until it engages. %
You can use the intermediate position of
emer gency key2 toattach theke yto akey
ri ng. R
R
eplacing t
eplacing t heke
he key batt
y batt ery
ery &
D
DAN
AN GER
GER Risk of fatal injuries due toswal-
lowing batteries
Bat teries contain toxic and cor rosive subs tan-
ces. Swall owing batteries may cause se vere
internal burns tooccur within two hours.
There is a risk of fatal injur y. #
Keep batteries out of there ach of chil-
dren. #
Ifth e cap and/or the battery compart-
ment does not close securel y,do not use
th eke y any lon ger and keep it out of the
re ach of children. #
If batteries are swallo wed, seek medical
attention immediatel y. +
ENVIR
ENVIR
ONMENT
ONMENT AL NO
AL NOTE
TEEnvironmen tal
damage due toimproper disposal of bat-
te ries Batteries contain pollutants. It is
illegal todispose of them with the household
ru bbish. #
Dispose of batteries in an
environmentally responsible manner.
Ta ke dischar ged batteries toaqu ali/ed
specialist workshop or toa collection
point for used batteries. R
R
eq
eq uir
uir ements:
ements:
R Youre qu ire a CR 2032 3 V cell batter y.
Mercedes-Benz recommends that you ha vethe
battery replaced at a quali/ed specialist work-
shop. #
Remo vethe emer gency key (/ page 76). 76
76
Opening and closing

#
Press release knob 2down fully and slide
co ver1 inthe direction of the ar row. #
Fold out co ver1 inthe direction of the ar row
and remo ve. #
Remo vebattery compartment 3and take
out the dischar ged batter y. #
Insert the new battery into battery compart-
ment 3. Obser vethe positive pole marking in
th e battery compartment and on the battery
when doing this. #
Push in battery compartment 3.#
Re-attach co ver1 and push it until it
engages. Pr
Pr
oblems wit
oblems wit h t
h the key
he key , tr
, troubleshoo
oubleshoo ting
ting Y Y
ou can no long ou can no long er loc
er lock or unloc
k or unloc k t
k the v
he v ehicle
ehicle
Po ssible causes:
R The key battery is weak or dischar ged. #
Check the battery using the indicator lamp
(/ page 74). #
Replace theke y batter y,if necessary
(/ page 76). #
Use there placement key. #
Use the emer gency keyto lock or unlock
(/ page 81). #
Have theke ych ecked at a quali/ed specialist
wo rkshop.
Ther
Ther e is int
e is int erf
erfer
erence fr
ence fr om a pow
om a pow er
erful r
ful r adio signal
adio signal
sour sour ce ce
Po ssible causes if the function of theke y is
impaired:
R high voltage po wer lines
R mobile phones
R electronic devices (no tebooks, tablets) R
shielding due tome tal objects or induction
loops for electrical gate systems or automatic
bar riers #
Make sure that there is su1cient distance
between theke y and the po tential sou rce of
inter fere nce.
Y
Y ou hav
ou hav e los
e lost a key
t a key #
Have theke y deactivated at a quali/ed spe-
cialist workshop. #
If necessar y,ha ve the mechanical lock
re placed as well. Doors
Doors
N
No
ot
tes on t
es on t he additional door lock
he additional door lock The additional door lock is only
available forve hi-
cles forth e United Kingdom. Opening and closing
77
77

This does not lock or unlo
ckthe fuel /ller 0ap.
The vehicle is not unloc ked:
R ifyo u ha veloc kedth eve hicle using thekey
R ifyo u ha veloc kedth eve hicle using KEYLESS-
GO Loc
Loc
king/unloc
king/unloc king t
king the v
he vehicle wit
ehicle wit h KEYLESS-GO
h KEYLESS-GO R
R
eq
eq uir
uir ements:
ements:
R The key is outside theve hicle.
R The dis tance between theke y and theve hicle
does not exceed 1 m.
R The driver's door and the door on which the
door handle is used are closed.
* NO
NO TE
TEDamage totheve hicle caused by
unintentionally opening the boot lid R
when using an automatic car wash
R when using a high pressure cleaner #
Deactivate the function of theke y in
th ese situations.
or #
Make sure that theke y is at a minimum
dis tance of 3 m away from theve hicle. Obser
vethe no tes:
R onwashing theve hicle in a car wash
(/ page 305)
R on using a high pressure cleaner
(/ page 306) #
T To unloc
o unloc k t
k the v
he v ehicle:
ehicle: touch the inner sur face
of the door handle. #
T
To loc
o loc k t
k the v
he v ehicle:
ehicle: touch sensor sur face 1
or 2. #
Conv
Conv enience closing:
enience closing: touch recessed sensor
sur face 2 until the closing process has been
comple ted.
% Further information on con venience closing
(/ page 94).
If yo u open the boot lid from outside, the boot lid
is automatically unloc ked. Pr
Pr
oblems wit
oblems wit h KEYLESS-GO, tr
h KEYLESS-GO, tr oubleshoo
oubleshooting
ting Y
Y
ou can no long
ou can no long er loc
er lock or unloc
k or unloc k t
k the v
he v ehicle using
ehicle using
KEYLESS-GO
KEYLESS-GO
Po ssible causes:
R The function of theke y has been deactivated.
R The key battery is weak or dischar ged. #
Activate the function of theke y (/ page 75). #
Check the battery using the indicator lamp
(/ page 74). Opening and closing
79 79

R
R
esol
esol ving pr
ving pr oblems wit
oblems wit h t
h the side windo ws
he side wind ows &
W
W ARNI NG
ARNI NGRisk of becoming trapped or
fata lly injured if reve rsing pr otection is not
activated
If yo u close a side window again immediately
aTer it has been bloc ked, the side window will
close with increased or maximum forc e. The
re ve rsing function is then not active and body
parts may become trapped. #
Make sure that no parts of the body are
in the closing area. #
Tostop the closing process, release the
button or press the button again to
re open the side windo w. A side windo
A side windo
w canno
w cannot be closed and y
t be closed and y ou cannot
ou cannot
see t
see t he cause.
he cause. #
Che cktosee whe ther any objects are in the
wind owguide. #
Adjust the side windo ws.
A
A djus
djus ting t
ting t he side window
he side window s
s If a side window is obstructed during closing and
re
opens again immediatel y: #
Immediately aTer this, pull and hold the cor re-
sponding button again until the side window
has closed and hold the button for at least one
more second (re-adjustment).
The side window will be closed without the
automatic reve rsing function.
If th e side window is obstructed again and
re opens again immediatel y: #
Immediately aTer this, pull and hold the cor re-
sponding button again until the side window
has closed and hold the button for at least one
more second (follo w-up adjustment).
The side window will be closed without the
automatic reve rsing function.
The side window The side window s canno
s cannot be opened or closed
t be opened or closed
using t
using t he conv
he conv enience opening f
enience opening f eatur
eature.
e.
Po ssible causes:
R The key battery is weak or dischar ged. #
Check the battery using the indicator lamp
(/ page 74). #
Replace theke y batter y,if necessary
(/ page 76). Anti-t
Anti-theT
heTprot
pr otection
ection F
F
unction of t
unction of t he immobiliser
he immobiliser The immobiliser pr
events your vehicle from being
star ted without the cor rect key.
The immobiliser is automatically activated when
th eve hicle is switched o., and deactivated when
th eve hicle is switched on. A A
T
TA
A (Anti-
(Anti- TheT
TheT Alar
Alarm syst
m syst em)
em) F
F
unction of t
unction of t heAT
he ATA systA syst em
em
If th eATA system is primed, a visual and audible
alarm is triggered in thefo llowing situations:
R when a door is opened
R when the boot lid is opened
R when the bonnet is opened
R when interior pr otection is triggered
(/ page 97) Opening and closing
95
95

AIRSCARF uses hea
ted air towa rm the head and
neck area of vehicle occupants. The warm air
0o ws out of theve nts in the head restraints. #
Press button 1repeatedly until the desired
heating le vel is set.
Depending on the heating le vel, up tothree
indicator lamps will light up. If all the indicator
lamps are o., AIRSCARF is switched o.. %
When switching on, the blo wer will start up
only aTer a preheating phase lasting a few
seconds.
ATer switching o., the blo wer will continue to
ru nfo r a few seconds tocool down the heat-
ing elements.
% Ifth eve hicle battery voltage is too lo w,AIR-
SCARF may switch o.. #
Adjust the AIRSCARF vent (/ page 152).
Make sure that no objects are co vering the air
inlet grille on the back of the head restraints.
Ma kesure that objects do not enter the air
intakes and outlets in the head restraints. S S
t
teer
eer ing wheel
ing wheel A
A
djus
djusting t ting t he st
he steer
eering wheel manually
ing wheel manually &
W
WARNING
ARNING Risk of accident due toadjust-
ing theve hicle settings while theve hicle is
in motion
Yo u could lose control of theve hicle in thefo l-
lowing situations in particular:
R ifyo u adjust the driver's seat, the head
re straint, the steering wheel or the mir ror
while theve hicle is in motion
R ifyo ufa sten your seat belt while theve hi-
cle is in motion #
Before starting theve hicle: in particular,
adjust the driver's seat, head restraint,
stee ring wheel and mir ror,and fasten
yo ur seat belt. &
W
WARNING
ARNING Risk of entrapment forch ildren
when adjusting the steering wheel
Children could injure themsel ves if they adjust
th e steering wheel. 110
110
Seats and st
owing

5
L Low beam/high beam
6 R Switches there ar fog light on/o.
When low beam is activated, theT indicator
lamp forth e standing lights will be deactivated
and replaced bytheL low- beam indicator
lamp. #
Always park your vehicle safely using su1cient
lighting, in accordance with there leva nt legal
stipulations.
* N
NOOTE
TE Battery dis charging byoperating the
standing lights Operating
the standing lights over a period of
hours puts a strain on the batter y. #
Where possible, switch on theright X
or leT Wparking light. Fo
rve hicles that are wider than 2 m or lon ger
th an 6 m,single-sided parking lighting is not per-
mitted in some countries. In this case, the stand-
ing lights are also switched on in the parking
lights position. If
th e battery is insu1cient lych arge d, the stand-
ing lights or parking lights will be switched o.
automatically tofacilitate the next engine start.
The exterior lighting (e xcept standing and parking
lights) will switch o. automatically when the driv-
er's door is opened.
R Obser vethe no tes on sur round lighting
(/ page 133).
A
A ut ut omatic dr
omatic dr iving lights function
iving lights function
When theve hicle is switched on, the standing
lights, low beam and daytime running lights are
switched on automatically depending on the light
conditions. &
W
WARNING
ARNING Risk of accident when the
dipped beam is switched o. in poor visi-
bility
When the light switch is set toà ,the
dipped beam may not be switched on auto-
matically if there is fog, snow or other causes
of poor visibility such as spr ay. #
In such cases, turn the light switch to
L . The automatic driving lights are only an aid.
Yo u
are responsible forve hicle lighting.
Switc Switc hing t
hing t he r
he rear f
ear f og lights on or
og lights on or o.
o.
R
R eq
eq uir
uir ements:
ements:
R The light switch is in theL orà posi-
tion. #
Press the R button.
Please obser vethe count ry-speci/c la wsonthe
use of rear fog lamps. 126
126
Light and sight