2021 MERCEDES-BENZ C-CLASS CABRIOLET service

Licence
fees may be applicable.
Using Mercedes-Benz Apps with voice con‐
trol
Re quirements:
R The registration forth e use of Mercedes-
Benz Apps has been comple ted.
R The general term s and conditions ha vebeen
con firm ed.
The o symbol indicates that a Mercedes-
Benz app can be used via voice control. #
Select a Mercedes-Benz app.
The app menu is displa yed. #
Touse voice control: selectoLan-
guage. #
Say thequ estion or command.
% Voice control is not available in all countries
and languages. Tu
neIn Radio Calling up
TuneIn Radio
Re quirements:
R There is an account on https://
www.me rcedes.me.
R The Internet Radio service is activated.
R The data volume is available.
Depending on the count ry, data volume may
need tobe pur chased.
R Afast Internet connection for data transmis‐
sion free of inter fere nce.
The services are countr y-dependent.
Fo r more information, consult a Mercedes-
Benz service centre.
Multimedia sy stem:
4 Radio 5
Þ Radio source #
Select TuneIn Radio.
The TuneIn Radio display appears. The last
st ation set starts playing.
% The connection quality depends on the local
mobile phone reception. Overview of
TuneIn Radio 1
Internet Radio pr ovider
2 Selec ted category
3 Display (if connec tedto private user
account)
4 Data transfer rate
5 Current station is stored as a favo urite
6 Additional information on the cur rent station 326
Multimedia sy stem

R
The audio equipment is "visible" forot her
devices.
Multimedia sy stem:
4 Media 5
à Media sources
5 á Bluetooth audio
Au thorising a new Blu etoo th®
audio device #
Select ¥. #
Select Add new Bluetooth audio device. #
Select Start search on the system .
De tected audio equipment is displ ayed in the
device list. #
Select a Blue tooth®
audio device.
Auth orisation starts. A code is displa yed on
th e multimedia sy stem and on the mobile
phone. #
Ifth e codes are identical, confi rmonthe
audio equipment.
The audio equipment is connec ted and play‐
back starts. Selecting pr
eviously authorised Blue tooth ®
audio equipment #
Select ¥. #
Select a Blue tooth®
audio device.
Establishing a connection from the Blue‐
to oth ®
audio equipment
The Blue tooth®
device name of the multimedia
sy stem is MB BLUETOOTH XXXXX. #
Select Search from device. #
Start the authorisation on the audio equip‐
ment (see manufacturer's operating instruc‐
tions).
A code is displa yed on the multimedia sys‐
te m and on the audio device. #
Confirm on bo thdevices if the codes are
identical.
The audio equipment is connected and play‐
back starts.
Wi th some audio equipment, playback must be
initially star ted on the device itself so that the
multimedia sy stem can play the audio files. %
Device-specific information on authorising
and connecting Blue tooth®
-capable mobile
phones can be ob tained at https://
www.me rcedes-benz-mobile.com/ or at a
Mercedes-Benz service cent re.
Ac tivating Blue tooth ®
audio
Multimedia sy stem:
4 Media 5
à Media sources #
Select áBluetooth audio.
The multimedia sy stem activates the connec‐
te d Blue tooth®
audio equipment.
Selecting the media pla yer on the Blue tooth ®
audio device
Multimedia sy stem:
4 Media 5
ª #
Select theBluetooth audio players category.
If multiple media pla yers are present on the
Blu etoo th®
audio equipment a list appears. #
Select a media pla yer.
Playback starts.
% The function is not suppo rted byeve ry
mobile phone. Multimedia sy
stem 339

Calling up
thera dio station list Multimedia sy
stem:
4 Radio 5
è #
Select a station. Sear
ching forra dio stations using station
names or direct frequency entry Multimedia sy
stem:
4 Radio 5
è #
Ente r astation name or frequenc y.#
Select a.
The sea rchre sults are displa yed. #
Select a station. St
oring radio stations Multimedia sy
stem:
4 Radio 5
ß Presets #
Select Store current station in the presets . Managing
radio station presets Multimedia sy
stem:
4 Radio 5
ß Presets
Moving stations: #
Highlight a preset entry and navigate tothe
left. #
Select Move highlighted station. #
Select a memo rypreset.
Deleting stations: #
Highlight a preset entry and navigate tothe
left. #
Select Delete highlighted station. #
Select Yes. Calling up a slide show (FM/DAB
radio mode) Multimedia sy
stem:
4 Radio 5
Þ Radio source
5 FM/DAB radio Slide show
1displa ysadditional information
pr ov ided bythest ation as an image. This can
include logos, album co vers, music trac ks, pro‐
grammes, ne wsor service information, forex am‐
ple. The additional information is shown in full-
sc reen mode byselecting 2. #
Toactivate full-screen mode: select#
Full screen. 342
Multimedia sy stem

#
Todeactivate full-sc reen mode: select
%. Ac
tivating or deactivating the frequency fix
function Multimedia sy
stem:
4 Radio 5
Z Options 5
Frequency fix #
Activate Oor deacti vate ª the function.
If th e function is activated, the set frequency
is ke pt eve n ifthere ception is poo r. Ta
gging music trac ks Multimedia sy
stem:
4 Radio
If ra dio stations pr ovide there leva nt information,
th is function allo wsyouto trans fer information
on the music track cur rently pl aying toan
Apple ®
device. You can then pur chase the audio
fi le from iTunes ®
. #
Select ♫→ Tag this song.
The track information is sa ved. Switching traf
fic announcements on/off Multimedia sy
stem:
4 System 5
õ Audio
5 Navigation and traffic announcements #
Activate Oor deacti vate ª the function.
or #
Press and hold the8 button on the multi‐
function steering wheel. Setting
the traf fic information service vol‐
ume increase Multimedia sy
stem:
4 System 5
õ Audio
5 Navigation and traffic announcements #
Select Traffic announcements volume
increase. #
Select No increase or avalue. Ac
tivating/deactivating radio text Multimedia sy
stem:
4 Radio 5
Z Options
5 Display radio text information #
Activate Oor deacti vate ª the function. TV
Information on
TVmode In
fo rm ation on copy right pr otection and
tradema rks
Ubiquitous DTCP-MOST
Copyright ®
20 15 Ubiquitous Corp.
DV B and DVB logos are tradema rks of theDVB
Project.
The TVtuner enables reception of digital chan‐
nels according tothefo llowing standards:
R DVB-T
R DVB-T2
In some countries, thest andards may not be
av ailable, or may not be available in all areas. Multimedia sy
stem 343

ASS
YST PLUS se rvice inter val display Fu
nction of the ASS YST PLUS se rvice inter val
displ ay The ASS
YST PLUS service inter val display on the
instrument display pr ovides information on the
re maining time or dis tance be fore the next
service due date.
Yo u can hide this service display using the back
button on the left-hand side of thesteering
wheel.
Depending on how theve hicle is used, the
ASS YST PLUS service inter val display may
shor tenth e service inter val, e.g. in thefo llowing
cases:
R mainly short-dis tance driving
R when the engine is of ten le ftidling for long
periods
R intheeve nt of frequent cold start phases
R vehicles with a diesel particulate filter: in
th eev ent of frequently inter rupted rege nera‐
tion of the diesel particulate filter Mercedes-Benz
recommends avoiding such
operating conditions.
Yo u can obtain information concerning the serv‐
icing of your vehicle from a qualified specialist
wo rkshop, e.g. a Mercedes-Benz Service Centre. Displaying
the service due da te On-board computer:
4 Service 5
ASSYST PLUS
The next service due date is displa yed. #
Toexitth e displa y:press the back button
on the left-hand side of thesteering wheel.
Bear in mind thefo llowing related topic:
R Operating the on-board computer
(/ page 228). Information on
regular maintenance work *
NO
TEPremature wearthro ugh failure to
obser veservice due dates Maintenance
workwhich is not car ried out at
th eright time or incomple tely can le adto
inc reased wear and damage totheve hicle. #
Adhere tothe prescribed service inter‐
va ls. #
Alw ays ha vethe prescribed mainte‐
nance workcar ried out at a qualified
specialist workshop. Special service
requ irements The prescribed service inter
val is based on nor‐
mal operation of theve hicle. Maintenance work
will need tobe per form ed more of ten if theve hi‐
cle is operated under arduous conditions or
increased loads.
The ASS YST PLUS service inter val display is only
an aid. The driver of theve hicle bears responsi‐
bility as rega rdsto whe ther maintenance work
needs tobe per form ed more of tenth an speci‐ 354
Maintenance and care

fi
ed based on the actual operating conditions
and/or loads.
Examples of arduous operating conditions:
R regular city driving with frequent intermedi‐
ate stops
R mainly short-dis tance driving
R frequent operation in mountainous terrain or
on poor road sur faces
R when the engine is of ten le ftidling for long
periods
R operation in particula rly dusty conditions
and/or if air-recirculation mode is frequently
used
In these or similar operating conditions, ha vethe
interior air filter, engine air cleaner, engine oil
and oil filter etc. changed more frequent ly. The
ty re s must be checked more frequently if the
ve hicle is operated under increased loads. Fur‐
th er information can be obtained at a qualified
specialist workshop. Battery disconnection periods
The ASS
YST PLUS service inter val display can
calculate the service due date only when the
battery is connec ted. #
Notedown the service due date displa yed on
th e instrument display before disconnecting
th e battery (/ page 354). Engine compartment
Ac
tive bonn et(pedestrian pr otection) Operation of
the active bonnet (pedestrian
pr otection)
In cer tain accident situations, the actuation of
th e active bonn etreduces therisk of injury to
pedestrians. The rear area of the bonn etis
ra ised byappr oximately 85 mm.
Fo rth e drive tothewo rkshop, reset the actuated
active bonn etyourself (/ page 355).
Af terth e active bonn ethas been actuated,
pedestrian pr otection may be limited.
Ha ve the full functionality of the active bonn et
re stored in a qualified specialist workshop. Re
setting the active bonnet &
WARNING Risk of bu rns from hot com‐
ponent parts in the engine compartment
Cer tain component parts in the engine com‐
partment can be very hot, e.g. the engine,
th e cooler and parts of theex haust sy stem. #
Allow the engine tocool down and only
to uch co mponent parts described in
th efo llowing. Maintenance and care
355

#
With your hand flat, push down active bonnet
1 inthe area around the hinges on bo th
sides (ar rows).
In doing so, the actuator is depressurised
and you may hear a hissing sound.
The engine bonnet must en gage in position. #
Ifth e active bonn etcan be raised slight lyat
th ere ar in the area of the hinges, repeat the
st ep until it engages cor rectl y. Opening and closing
the bonnet &
WARNING Risk of accident due todriv‐
ing with the bonn etunlo cked
The bonn etmay open and block your vie w. #
Neverre lease the bonn etwhen driving. #
Before every trip, ensure that the
engine bonn etis loc ked. &
WARNING Risk of accident and inju ry
when opening and closing the bonn et
The bonnet may suddenly drop into the end
position.
There is a risk of injury for an yone in the
engine bonn et's range of mo vement. #
Do not open or close the bonn etifth ere
is a person in the bonn et's range of
mo vement. &
WARNING Risk of bu rns when opening
th e bonn et
If yo u open the bonn etwhen the engine has
ove rheated or when there is a fire inthe
engine compartment, thefo llowing situations
may occur:
R You could come into contact with hot
ga ses.
R You could come into contact with other
hot, escaping operating fluids. #
Before opening the bonn et, allow the
engine tocool down. #
Intheeve nt of a fire inthe engine com‐
partment, keep the bonn etclosed and
call thefire service. &
WARNING Risk of inju rydue tomoving
parts
Components in the engine compartment may
continue running or start up sudden ly,even if
th e ignition is switched off.
Make sure of thefo llowing before per form ing
ta sks in the engine compartmen t: #
Switch the ignition off. #
Neverre ach into the danger zone sur‐
ro unding moving co mponents, e.g. the
ro tation area of thefa n. #
Remo vejewe llery and watches. #
Keep items of clo thing and hair away
from moving parts. 356
Maintenance and care

#
Slowly slide oil dipstick 1into the guide
tube tothestop, and pull it out again af ter
about thre e seconds.
R Oil le vel is cor rect: oil le vel is between 2
and 3.
R Oil le velto o low: oil le vel is at 3or
belo w.
R Oil le velto o high: oil le vel is abo ve2 . #
Ifth e oil le vel is too lo w,top up with 1 litre of
engine oil. #
Ifth e oil le vel is too high, drain off excess
engine oil. Consult a qualified specialist
wo rkshop.
Checking the engine oil le vel using the on-
board compu ter
Re quirements:
R The engine has an oil le vel sensor. If not, the
engine oil le vel can be checked only with the
oil dipstick (/ page 358).
R The engine has been warmed up.
R The vehicle is par ked on a le vel sur face.
R The engine is running at idle speed. R
The bonnet is closed.
The engine oil le vel is de term ined during driving.
De term ining the engine oil le vel can take up to
30 minutes with a normal driving style and even
longer with an active driving style.
On-board computer: 4 Service 5
Engine oil level
One of thefo llowing messages will appear on
th e multifunction display:
R Engine oil level Measuring now : measure‐
ment of the oil le vel is not yet possible. #
Repeat there qu est af ter a maximum of
30 minutes' driving.
R Engine oil level OK andthe bar display for
indicating the oil le vel on the multifunction
display is green and is between "min" and
"max": the oil le vel is cor rect.
R Engine oil level Add 1.0 l andthe bar display
fo r indicating the oil le vel on the multifunc‐
tion display is orange and is below "min": #
Add 1 l of engine oil. R
Reduce engine oil level andthe bar display
fo r indicating the oil le vel on the multifunc‐
tion display is orange and is abo ve"max": #
Drain off any excess engine oil that has been
added. Todo so, consult a qualified specialist
wo rkshop.
R For engine oil level turn on ignition #
Switch on the ignition tocheck the engine oil
le ve l.
R Engine oil level System inoperative : The oil
le ve l sensor is defective or not connec ted. #
Consult a qualified specialist workshop.
R Engine oil level System currently unavail. #
Close the bonn et.
To pping up engine oil &
WARNING Risk of bu rns from hot com‐
ponent parts in the engine compartment
Cer tain component parts in the engine com‐
partment can be very hot, e.g. the engine,
th e cooler and parts of theex haust sy stem. Maintenance and care
359