change wheel MERCEDES-BENZ C-CLASS CABRIOLET 2021 Owners Manual

Climate control
........................................ 13 3
Overview of climate contro l systems ..........1 33
Operating the climate control sy stem ......... 13 3 Driving and pa
rking .................................. 137
Driving ........................................................ 137
DY NA MIC SELECT switch ............................1 48
Au tomatic transmission .............................. 15 0
Fu nction of the 4MATIC .............................. 15 5
Re fuelling .................................................... 15 5
Pa rking ........................................................ 161
Driving and driving sa fety sy stems .............1 68
Tr ailer hit ch................................................. 219
Bicycle rack function .................................. 224
Ve hicle towing instructions ........................ .225 Instrument display and on-board
comp
uter.................................................. 226
No tes on the instrument display and on-
board computer .......................................... 226
Instrument display overview ...................... .227
Overview of buttons on thesteering
wheel ..........................................................2 28
Operating the on-board computer .............. 228 Overview of displa
yson the multifunc‐
tion display .................................................2 29
Head-up display .......................................... 230 LING
UATRONIC ........................................ 232
No tes on operating saf ety .......................... 232
Ope ration ................................................... 232
Using LINGU ATRO NIC ef fectively ............... 234
Essential voice commands ........................ .235 Multimedia sy
stem .................................. 247
Overview and operation .............................. 247
Sy stem settings .......................................... 256
Fit & Healt hy............................................... 268
Na vigation .................................................. 269
Te lephone .................................................. .295
Online and Internet functions ..................... 322
Media ........................................................ .327
Ra dio .......................................................... 340
TV ............................................................... 343
Sound ......................................................... 351 Main
tenance and care ............................. 354
ASS YST PLUS service inter val display ........ 354
Engine compartment .................................. 355
Cleaning and care ...................................... .362 Breakdown assi
stance ............................ 372
Emergency ................................................. .372
Flat tyre ...................................................... 374
Battery (vehicle) .......................................... 381
To w- starting or towing away ....................... 386
Electrical fuses ........................................... 391 Wheels and tyres
..................................... 395
No tes on noise or unusual handling char‐
acteristics .................................................. .395
No tes on regular lyinspecting wheels and
tyres .......................................................... .395
No tes on snow chains ................................ 395
Ty re pressure .............................................. 396
Wheel change ............................................ .400
Emergency spa rewheel .............................. 41 0 Con
tents 3

tion, number of wheel
revo lutions or thefa s‐
te ned seat belts displ ay
R ambient conditions, such as temp erature,
ra in sensor or dis tance sensor
General ly,th e use of these data is temp orar y;
th ey will not be stored be yond the period of
operation and will only be processed within the
ve hicle itself. Control units of ten contain da ta
memories forve hicle keys,fo rex ample. Their
use permits thete mp orary or permanent docu‐
mentation of tech nical information about the
ve hicle's operating state, component loads,
main tenance requ irements and tech nical events
or faults.
Depending on theve hicle equipment, thefo llow‐
ing data are stored:
R operating status of sy stem components,
such as fill le vels, tyre pressure or battery
st atus
R malfunctions or faults in impor tant sy stem
components, such as lights or brakes
R system reactions in special driving situations,
such as airbag deployment or the inter ven‐
tion of stability control sy stems R
information on events leading tovehicle
damage
In cer tain cases, it may be requiredtostore data
th at wo uld ha veotherwise been used only tem‐
poraril y.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,st ored operational data as
we ll as theve hicle identification number can be
re ad out and used. They can be read out by
service network emplo yees, such as workshops
and manufacturers or third parties, such as
breakdown services. The same is true in the
case of warranty claims and quality assurance
measures.
In general, there adout is per form ed via the
legally prescribed port forth e diagnostics con‐
nection in theve hicle. The operational data that
are read out document tech nical states of the
ve hicle or of individual components and assist in
th e diagnosis of malfunctions, compliance with
wa rranty obligations and quality impr ovement.
To that end, these data, in particular information
about component loads, tech nical events, mal‐ functions and
other faults may be transmitted
along with theve hicle identification number to
th e manufacturer. Furthermore, the manufac‐
turer is subject toproduct liability. Forth is rea‐
son the manufacturer also uses operational data
from theve hicle, forex ample, forre calls. These
da ta can also be used toexamine the cus tom‐
er's warranty and guarantee claims.
Fa ult memories in theve hicle can be reset by a
service outlet or at your requ est as part of repair
or maintenance work.
Con venience and inf otainment functions
Yo u can store con venience settings and individ‐
ual settings in theve hicle and change or reset
th em 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 control settings
R individual settings, such as interior lighting
Depending on the selected equipment, you can
import data into vehicle inf otainment functions
yo urself. 34
General no tes

#
Using buttons 1to4 , adjust the conto ur
of the backrest individually tosuit your bac k. Head
restra ints Ad
justing the front seat head restra ints man‐
ually &
WARNING Risk of accident due to
adjusting vehicle settings while theve hi‐
cle is in motion
Yo u could lose cont rol of theve hicle in the
fo llowing situations in particular:
R Ifyo u adjust the driver's seat, the head
re stra ints, thesteering wheel or the mir‐
ro r while theve hicle is in motion.
R Ifyo ufast enyour seat belt while theve hi‐
cle is in motion. #
Before starting the engine: adjust the
driver's seat, the head restra ints, the
st eering wheel and the mir ror and fas‐
te nyo ur seat belt. &
WARNING Risk of inju rydue tohead
re stra ints not being fitted or being adjus‐
te d incor rectly
If head restra ints ha venot been ins talled or
ha ve not been adjus ted cor rectly, there is an
increased risk of injury in the head and neck
area, e.g. in theev ent of an accident or when
braking. #
Alw ays drive with the head restra ints
fi tted. #
Before driving off, ma kesure forev ery
ve hicle occupant that the cent reofthe
head restra int supports the back of the
head at about eye le vel. Do not inter
change the head restra ints of the
front and rear seats. Otherwise, you will not be
able toadjust the height and angle of the head
re stra ints cor rectl y.
Ad just the head restra int fore -and-aft position so
th at it is as close as possible tothe back of your
head. #
Toraise: pullthe head restra int up. #
Tolowe r:press release knob 1inthe direc‐
tion of the ar row and push the head restra int
down. #
Tomo veforw ards: pullthe head restra int
fo rw ards. #
Tomo vebackwards: press and hold release
knob 2. 100
Seats and stowing

Operating
the memory function St
oring #
Set the desired position for all sy stems. #
Brief lypress memory button Vandthen
press preset position 4,TorU
within thre e seconds.
An acoustic signal sounds. The settings are
st ored. #
Tocall up: press and hold preset position
button 4,TorU until all the sys‐
te ms are in thestored position.
% When youre lease the preset position button,
st eering wheel, the seat and mir ror setting
functions stop immediatel y.The head-up dis‐
play continues tobe adjus ted. St
ow age areas Note
s on loading theve hicle &
DANG ER Risk of exhaust gas poisoning
Combustion engines emit poisonous exhaust
ga ses such as carbon monoxide. Exhaust
ga ses can enter theve hicle interior if the
boot lid is open when the engine is running,
especially if theve hicle is in motion. #
Alw ays switch off the engine before
opening the boot lid. #
Never drive with the boot lid open. &
WARNING Risk of inju ryfrom unsecu red
items in theve hicle
If objects, luggage or loads are not secured
or not secured suf ficientl y,they could slip,
tip ove r or be throw n around and thereby hit
ve hicle occupants.
There is a risk of injur y,particularly in the
ev ent of sudden braking or a sudden change
in direction. #
Alw aysstow objects in such a wayth at
th ey cannot be thro wn around. #
Before the journe y,secure objects, lug‐
ga ge or loads against slipping or tipping
ove r. &
WARNING Risk of inju rydue toobjects
being stowed incor rectly
If objects in theve hicle interior are stowed
incor rectly, they can slide or be thrown
around and hit vehicle occupants. In addi‐
tion, cup holders, open stowage spaces and
mobile phone brac kets cann otalw aysre tain
all objects they contain. 11 0
Seats and stowing

%
The duration until the colour changes varies
depending on the usage conditions. Mir
rors Operating
the outside mir rors &
WARNING Risk of inju ryifve hicle set‐
tings are adjus ted while theve hicle is in
motion
Yo u could lose cont rol of theve hicle in par‐
ticular in thefo llowing situations:
R Ifyo u adjust the driver's seat, the head
re stra ints, thesteering wheel or the mir‐
ro r while theve hicle is in motion.
R Ifyo ufast enyour seat belt while theve hi‐
cle is in motion. #
Before starting the engine: adjust the
driver's seat, head restra ints, steering
wheel and mir ror in particular and fas‐
te nyo ur seat belt. &
WARNING Risk of accident due tomis‐
judgement of dis tance when using the
outside mir ror
The outside mir rors reflect objects on a
smaller scale. The objects in view are in fact
closer than they appear. #
Therefore, alw ays look over your shoul‐
der in order toensure that you are
aw are of the actual dis tance between
yo u and thero ad users driving behind
yo u. Fo
lding the outside mir rors in/out #
Brief lypress button 1.
Re setting the outside mir rors
% Ifth e battery has been disconnected or com‐
ple tely discharged, the outside mir rors must
be reset. Only then will the automatic mir ror
fo lding function workproperly. #
Brief lypress button 1. 13 0
Light and sight

Non-combus
ted fuel may get into the cata‐
lytic con verter. #
Only depress the accelera tor pedal
slightl y. #
Have the cause rectified immediately at
a qu alified specialist workshop. *
NO
TEReduced battery life due tofre‐
qu ent short-dis tance trips The
12V battery may not be suf ficiently
ch arge d when theve hicle is used only for
short-dis tance trips. This reduces the life of
th e batter y. #
Drive longer di stances regular lyto
ch arge the batter y. Note
s on driving with a roof load, trailer or
fully laden vehicle
When driving with a loaded roof luggage rack or
trailer as well as with a fully laden or fully occu‐
pied vehicle, theve hicle's driving and steering
ch aracteristics change. Yo
u should bear thefo llowing in mind:
R Do not exceed the permissible roof load and
to wing capacity. Also obser vethete ch nical
da ta inthe printed Owner's Manual.
R Evenly distribute thero of load, and place
heavy objects at the bottom. Also comply
with the no tes on loading theve hicle
(/ page 110).
R Drive attenti vely, and avoid suddenly pulling
aw ay, braking and steering as well as rapid
cornering.
Note s on driving on salt-treated roads
The braking ef fect is limited on salt-trea ted
ro ads.
Therefore, obse rveth efo llowing no tes:
R due tosalt build-up on the brake disks and
brakepads, the braking dis tance can increase
conside rably or result in braking only on one
side
R maintain a much greater safe dis tance tothe
ve hicle in front To
remo vesalt build-up:
R brake occasionally while paying attention to
th e tra ffic conditions
R carefully depress the brake pedal at the end
of the journey and when starting the next
journey
Note s on aquaplaning
Aq uaplaning can take place once a cer tain
amount of water has accumulated on thero ad
sur face.
Obser vethefo llowing no tes during heavy precip‐
itation or in conditions in which aquaplaning may
occur:
R reduce speed
R avoid tyre ruts
R avoid sudden steering mo vements
R brake careful ly
% Also obser vethe no tes on regular lych ecking
wheels and tyres (/ page 395).14 4
Driving and pa rking

#
Shift the transmission toposition hork.
If h is selected, the transmission only shifts
to one gear; if kis selec ted, the transmis‐
sion shifts toreve rsege ar. #
Have the transmission checked at a qualified
specialist workshop immediately. Manual
gearshifting When
the automatic transmission is shif tedto
position h,you can manually shift it with the
st eering wheel gearshift paddle. If permit ted, the
automatic transmission shifts toa higher or
lo we rge ar depending on thesteering wheel
ge arshift paddle being pulled. Yo
u ha vetwo options tomanually shift the auto‐
matic transmission:
R Temp orary setting
R Perm anent setting
The gears shift automatically when manual shift‐
ing is deactivated.
Te mp orary setting: #
Toactivate: Pullsteering wheel gearshift
paddle 1or2.
Manual shifting is activated for a short time.
The transmission position display sho wsp
and the cur rent gear.
% How long the manual shifting stay s activated
is dependant on various factors.
Manual shi fting can be automatically deacti‐
va ted in thefo llowing cases:
R Changing the drive prog ram
R Restarting theve hicle
R When the transmission position his
engaged again
R Driving style #
Toshift up: Pullsteering wheel gearshift
paddle 2. #
Toshift down: Pullsteering wheel gearshift
paddle 1. #
Todeactivate: Pullsteering wheel gearshift
paddle 2and hold it in place.
The transmission position display sho wsh.
Pe rm anent setting: #
Change todrive prog ram =(/ page149). #
Select drive setting p(/ page 150). Gearshif
tre commendation The
gearshift recommendation assists you in
adopting an economical driving style. Driving and parking
15 3

%
Glide mode can be ended bypressing a
st eering wheel gearshift paddle
(/ page 153). Fu
nction of the 4MATIC
4MATIC ensures that all four wheels are driven.
To get her with ESP ®
and 4ETS, 4MATIC impr oves
th e traction of your vehicle whene ver a driven
wheel spins due toinsuf ficient traction.
If yo ufa ilto adapt your driving style, 4MATIC can
neither reduce therisk of an accident nor over‐
ri de the la wsof ph ysics. 4MATIC cannot take
account of road, weather and traf fic conditions.
4MATIC is only an aid. You are responsible espe‐
cially for maintaining a safe dis tance from the
ve hicle in front, forve hicle speed, for braking in
good time and forst ay ing in lane.
% In wint ryroad conditions, the maximum
ef fect of 4MATIC can be achie ved only if you
use winter tyres (M+S tyres), with sn ow
ch ains if necessar y. Re
fuelling Re
fuelling theve hicle &
WARNING Risk offire or explosion from
fuel
Fu els are highly flammable. #
Fire, naked flames, smoking and crea‐
tion of spar ksmust be avoided. #
Swit choff the ignition and, if available,
th est ationary heater, before and while
re fuelling theve hicle. &
WARNING Risk of inju ryfrom fuels
Fu els are poisonous and hazardous to your
health. #
Do not swallow fuel or let it come into
contact with skin, eyes or clo thing. #
Do not inhale fuel vapour. #
Keep children away from fuel. #
Keep doors and windo wsclosed du ring
th ere fuelling process. If
yo u or other people come into contact with
fuel, obser vethefo llowing: #
Immediately rinse fuel off your skin with
soap and water. #
If fuel comes into contact with your
ey es, immediately rinse them thor‐
oughly with clean water.Seek medical
attention immediately. #
Ifyo u swallow fuel, seek medical atten‐
tion immediatel y.Do not induce vomit‐
ing. #
Change immediately out of clo thing that
has come into con tact wi thfuel. &
WARNING Risk offire and explosion due
to electros tatic charge
Electros tatic charge can igni tefuel vapour. #
Before you open the fuel filler cap or
ta ke hold of the pump nozzle, touch the
me tallic vehicle body. Driving and parking
15 5

Ac
tive Steering Assist Fu
nction of Active Steering Assist
Ac tive Steering Assist is only available up to a
speed of 210 km/h. The sy stem helps youto
st ay inthe cent reofthe lane bymeans of mod‐
erate steering inter ventions. Depending on the
speed driven, Active Steering Assist uses the
ve hicles ahead and lane markings as a refer‐
ence.
% Depending on the count ry, in the lo wer
speed range Active Steering Assist can use
th e sur rounding traf fic as a refere nce. If nec‐
essar y,Ac tive Steering Assist can then also
pr ov ide assis tance when driving outside the
centre of the lane, forex ample, toform a
re scue lane.
If th e de tection of lane markings and vehicles
ahead is impaired, Active Steering Assist
switches topassive mode. The sy stem pr ovides
no support in this case.
St atus display of Active Steering Assist in
th e multifunction display
R Ø (gre y): activated and passive
R Ø (gre en): activated and active R
Ø (red): sy stem limits de tected
R Ø (white, red hands): "hands on thesteer‐
ing wheel" prom pt
% During the transition from active topassive
st atus, theØ symbol is shown as
enlar ged and flashing. Once the sy stem is
passive, theØ symbol is shown as gr eyin
th e multifunction displa y.
% Depending on the selected vehicle settings,
Ac tive Steering Assist may be una vailable.
Ste ering and touch de tection
The driver is requiredtokeep their hands on the
st eering wheel at all times and be able tointer‐
ve ne at any time tocor rect the course of the
ve hicle and keep it in lane. The driver must
ex pect a change from active topassive mode or
vice versa at any time. If
th e sy stem de tects that the driver has not
st eered theve hicle for a considerable period of
time or has remo vedth eir hands from thesteer‐
ing wheel, display 1appears. If the driver still
does not steer theve hicle, a warning tone
sounds in addition tothe visual warning mes‐
sage.
If th e driver does not react tothewa rning for a
considerable period, the sy stem can initiate an
emer gency stop (/ page188).
The warning is not issued or is stopped when the
driver gives con firm ation tothe sy stem:
R The driver steers theve hicle. 18 6
Driving and pa rking

R
Depending on the count ry:th e driver
presses a steering wheel button or operates
To uch Control
If Ac tive Steering Assist de tects that a sy stem
limit has been reached, a visual warning is
issued and a warning tone sounds.
Obser vethe no tes on driving sy stems and your
re sponsibility; you may otherwise failto recog‐
nise dangers (/ page 168).
Sy stem limits
Ac tive Steering Assist has a limited steering tor‐
qu efo r lateral guidance. In some cases, the
st eering inter vention is not su fficient tokeep the
ve hicle in the lane or todrive thro ugh exits.
The sy stem may be impaired or may not function
in thefo llowing ins tances:
R The reis poor visibilit y,e.g. due tosno w,rain,
fo g, heavy spr ay, greatly varying light condi‐
tions or strong shado wsonthe car riag ewa y.
R There is glare, e.g. from oncoming traf fic,
di re ct sunlight or reflections.
R Insuf ficient road illumination. R
The windsc reen is dirty, mis ted up, damaged
or co vered in the vicinity of the camera, e.g.
by ast icke r.
R No, or se veral, unclear lane markings are
present for one lane, or the markings change
qu ickl y,forex ample, in a con stru ction area
or junctions.
R The lane markings are wornaw ay, dark or
co vered up, e.g. bydirt or sno w.
R Ifth e dis tance totheve hicle in front is too
short and thus the lane markings cann otbe
de tected.
R The road is nar rowand winding.
R There are obs tacles on the lane or projecting
out into the lane, such as object mar kers.
The sy stem does not pr ovide assis tance in the
fo llowing conditions:
R On tight bends and when turning.
R When crossing junctions.
R Atroundabouts or tollst ations.
R When towing a trailer.
R When the tyre pressure is too lo w. &
WARNING Risk of accident if Active
St eering Assist unexpectedly stops func‐
tioning
If th e sy stem limits of Active Steering Assist
are reached there is no guarantee that the
sy stem will remain active or will keep the
ve hicle in lane. #
Alw ayske ep your hands on thesteering
wheel and obser vethe tra ffic carefull y. #
Alw aysst eer theve hicle paying atten‐
tion totraf fic conditions. &
WARNING Risk of accident if Active
St eering Assist unexpectedly inter venes
The de tection of lane markings and objects
may malfunction and cause unexpected
st eering inter ventions. #
Steer according totraf fic conditions. Ac
tivating Active Steering Assist
Re quirements:
R ESP ®
must be activated, but not inter vening. Driving and pa
rking 187