change time MERCEDES-BENZ C-CLASS CABRIOLET 2021 Owner's Guide

A CI+ module (Common Inter
face Module),
whi chis not included in the scope of deliver y,is
used todecrypt HD programmes according to
th e CI+ standard. In some countries, an addi‐
tional smart card is requ ired, which is inse rted
into the CI+ module (see the manufacturer's
operating manual).
The TVtuner is in the boot recess. The CI+ mod‐
ule is inse rted into theTV tune r.
* NO
TEDama getothe CI+ module and
Smart Card The CI+ module is designed
for use in the
home. The CI+ module can overheat and be
damaged bycontinuous exposure tohigh
outside temp eratures. #
Make sure that the CI+ module is not
subject tohigh temp eratures forex ten‐
ded pe riods of time.
If th e CI+ module is damaged, no
encryp tedch annels can be recei ved. The
TVtuner can recei veprogrammes in Dolby
Digital Plus. Manufactured under licence from Dolby Labora‐
to
ries. Dolb y,Dol byAudio and the double-D sym‐
bol are trademar ksof Dolby Laboratories.
The TVtuner au tomatically sets theTV standard.
TV reception is dependent on thefo llowing fac‐
to rs:
R Speed
R Characteristics of the selected TVchannel TV
reception may be influenced bythefo llowing
fa ctors:
R Electronic devices whi chare take n into the
ve hicle may impair TVreception.
R The conditions forre ception may change
whilst theve hicle is in motion.
Po or reception conditions can ha vethefo llowing
ef fect:
R The TVtuner switches toan alternative digi‐
ta lch annel with better reception wi th the
same programme content.
R The TVtuner mu testh e sound, freezes the
screen or hides it. The tsymbol appears
in the displa y. Switching
toTV mode Multimedia sy
stem:
4 Media 5
à Media sources #
Select TV.
The TVpicture appears. If available, the
ch annel and prog ramme information is dis‐
pla yed. 344
Multimedia sy stem

Multimedia sy
stem:
4 Media 5
à Media sources 5
TV
5 ß Presets #
Select theTV channel.
Selecting TVchannels in the bac kground
Re quirements:
R An application is active, e.g. the navigation.
R TVmode is switched on in the bac kground
and the sound from the selected TVchannel
can be heard #
Press theD button on theto uchpad.
The media menu is called up. #
Navigate up or down.
The next or pr evious TVchannel is selec ted. Displaying cur
rent prog ramme in form ation
fo r the selected channel (EPG)
Multimedia sy stem:
4 Media 5
à Media sources 5
TV
5 Z Options #
Select Electronic Program Guide.
EPG displa ys thefo llowing information (if
av ailable):
R Broadcast times
R Names of the cur rent and upcoming pro‐
grammes #
Select programme information and confirm.
The de tails are displa yed. #
Toscroll: swipe up or down on theto uch‐
pad. #
Toexitth e detailed displa y:press the%
button.
Fu nction of thech annel fix setting
Channel fix is switched on
The channel is not changed. This is useful if, for
ex ample, you drive theve hicle thro ugh reception re
gions that ove rlap. It pr events frequent switch‐
ing ba ckand forth between thech annels.
The FIXindicator is displa yed af terth e name of
th eTV channel.
Channel fix is switched off
Depending on reception qualit y,theTV tuner
au tomatical lyswitches toan alternative channel
with the same programme conte nt but better
re ception. Using this function, the best possible
te levision picture can be found, rega rdless of the
re ception qualit y.
Ac tivating/deactivating channel fix
Multimedia sy stem:
4 Media 5
à Media sources 5
TV
5 Z Options #
Switch Channel fix onO or off ª. Channel list
overview The
TVtuner sho wsthe cur rent programme on
th e digital TVchannels or radio stations with
adequate reception in its ownch annel list. Multimedia sy
stem 347

#
Make sure that the CI+ module is not
subject tohigh temp eratures forex ten‐
ded pe riods of time.
If th e CI+ module is damaged, no
encryp tedch annels can be recei ved. The
TVtuner is in the boot recess. #
Ifre qu ired (countr y-dependent), insert the
smart card into the CI+ module slot. #
Remo vethe pr otective cap from theTV tune r. #
Insert the CI+ module into theTV tuner sl ot. #
Place the pr otective cap on theTV tune r.
When the CI+ module is inser ted cor rectly,
encryp ted HD programmes can be recei ved
according toCI+ standard.
If th e CI+ module is not compatible, an er ror
messa geappears.
Calling up the CI+ module menu
Multimedia sy stem:
4 Media 5
à Media sources 5
TV
5 Z Options #
Select CA module. #
Select a menu option.
% You can view the subscription number in the
CI+ menu. You need this to extend the sub‐
scription, forex ample.
If playback is malfunctioning, you can try to
re sol vethe problem with Restart CI+ mod-
ule.
Fu rther information can be found in the man‐
ufacturer's operating instructions. Sound
To
ne settings Information about
the sound sy stem
The sound sy stem has a total output of 100 W
and is equipped with five speakers. It is available
fo r all functions in thera dio and media modes.
% The call can also be made from other audio
sources. Replace Media with, forex ample,
Ra dio in the menu path. Calling up
the sound menu
Multimedia sy stem:
4 Media 5
à Sound
The following functions are available:
R Equaliser
R Balance and Fader
R Automatic volume adjustment
R Other sound settings #
Select a sound menu.
Ad justing treble, mid- range and bass set‐
tings
Multimedia sy stem:
4 Media 5
à Sound 5
Equaliser #
Select Treble, MidorBass. #
Change the settings. Multimedia sy
stem 351

#
Left-hand drive vehicle: pulltab1
upwards. #
Right-hand drive vehicle: pulltab1 down‐
wa rds. #
Remo vefire extinguisher 2. Flat tyre
Note
s onflat tyres &
WARNING Risk of accident due toaflat
tyre
A flat tyre se verely affects the driving charac‐
te rist ics as well as thesteering and braking
of theve hicle.
Ty res without run-flat characteristics: #
Do not drive with a flat tyre. #
Chan getheflat tyre immediately with
an emer gency spa rewheel or spare
wheel. Alternativel y,consult a qualified
specialist workshop.
Ty res with run-flat characteristics: #
Obse rveth e information and warning
no tes on MOExtended tyres (run-flat
tyres). In
theeve nt of a flat tyre, thefo llowing options
are available depending on your vehicle's equip‐
ment:
R Vehicles with MOExtended tyres: it is pos‐
sible tocontinue the journey for a short
period of time. Make sure you obse rvethe
no tes on MOExtended tyres (run-flat tyres)
(/ page 375).
R Vehicles with a TIREFIT kit: you can repair
th e tyre so that it is possible tocontinue the
jou rney for a short period of time. Todo this,
use the TIREFIT kit (/ page376).
R Vehicles with Mercedes me connect: you
can make a call for breakdown assi stance via
th eove rhead control panel in the case of a
breakdown (/ page313).
R Allvehicles: change the wheel
(/ page 405). 374
Breakdown assis tance

Aluminium hub cap
#
Toremo ve:position soc ket2 from the tyre-
ch ange tool kit on hub cap 1.#
Position wheel spanner 3on soc ket2. #
Using wheel spanner 3, turn hub cap1
anti-clo ckwise and remo veit. #
Tofit: follow the instructions abo vein
re ve rse order.
% Specified tightening torq ue: 25 Nm. Ra
ising theve hicle when changing a wheel Re
quirements:
R There are no persons in theve hicle.
R The vehicle has been prepared for a wheel
ch ange (/ page 405).
R The wheel trims and hub caps ha vebeen
re mo ved (/ page 405).
Impor tant no tes on using the jack:
R Use only a vehicle-specific jack that has
been appr oved byMercedes-Benz toraise
th eve hicle.
R The jack is only designed forra ising and
holding theve hicle for a short time while a
wheel is being changed and not for mainte‐
nance workunder theve hicle.
R The jack must be placed on a firm ,fl at and
non-slip sur face. If necessar y,use a lar ge,
fl at, load-bearing, non-slip unde rlay.
R The foot ofthe jack must be positioned verti‐
cally under the jack support point. Ru
les of conduct when theve hicle is raised:
R Never place your hands or feet under the
ve hicle.
R Never lie under theve hicle. 406
Wheels and tyres

#
Do not al terth e engine oil or oil filter in
order toachie velonger change inter vals
th an presc ribed. #
Do not use additives. #
Have the engine oil rene we d at regular
inter vals. Mercedes-Benz
recommends that you ha vethe
oil change car ried out at a qualified specialist
wo rkshop.
Only use engine oils appr oved byMercedes-
Benz.
Pe trol engines: for cer tain countries, dif fere nt
engine oils can be used in conjunction wi th
re duced maintenance inter vals.
% Further information on dif fere nt engine oils
can be ob tained at a qualified specialist
wo rkshop. Quality and capacity of engine oil Pe
trol engine sM B-Freigabe or MB-
Appr oval
C 400 4MATIC 229.5
229.6*
All other models 229.51 , 229.52,
229.61
229.71* Diesel engines MB-
Freigabe or MB-
App roval
All model s2 29.52, 229.61
229.71* *
re commended for lo west possible fuel con‐
sum ption (lo westSA E viscosity class in ea ch
case; obser vepossible restrictions of the
appr ovedSA E viscosity classes)
To achie vethe lo west possible fuel consum ption,
it is recommended touse the engine oil specifi‐
cations mar ked in theta ble forth e lo west SAE viscosity class.
Possible restrictions of the
appr ovedSA E viscosity classes mu stbe
obser ved.
% Ifth e engine oils lis ted in theta ble are not
av ailable, you may add a maximum of
1. 0 litr e ofthefo llowing engine oils once
onl y.
Engine oils for one-time filling only in exceptional
cases:
R vehicles with a petrol engine:
- C 400 4MATIC: MB-Freigabe or MB-
Appr oval 229.3 or ACEA A3/B4
- allother models: MB-Freigabe or MB-
Appr oval 229. 31orAC EA C3
R vehicles with a diesel engine: ACEA C3
The following values referto an oil change,
including the oil filter. Te
ch nical da ta423

DIRECT SELECT le
ver
Engaging drive position........................ .152
Engaging neutral................................... .151
Engaging pa rkposition.......................... 15 2
Engaging pa rkposition automatically....1 52
Engaging reve rsege ar........................... .151
Fu nction................................................ 15 0
Display (care) ............................................ .369
Display (multimedia sy stem)
Settings................................................. 256
Display (on-boa rdcompu ter)
Displ ays on the multifunction displa y.... 229
Displ aymessage
Calling up (on-board compu ter)............ .430
No tes....................................................4 30
Display messages ¯ - - - km/h ..................................... 457
ç - - - km/h ..................................... 458
È - - - km/h ..................................... 457
# 12V battery See Owner's Man‐
ual......................................................... 472K
12V battery See Owner's Man‐
ual......................................................... 437
Û 48 V battery See Owner's Man‐
ual..........................................................4 74
: Active Light Sy stem inoperative... 439
¯ AdBlue sy stem fault Emer. op.:
max. XXX mphSt art not poss. in XXX
miles .................................................... .482
¯ AdBlue sy stem fault Emer‐
ge ncy op. in XXX km See Owner's
Manual.................................................. 481
¯ AdBlue sy stem fault Engine
st art not possible................................. .482
¯ AdBlue sy stem fault See Own‐
er's Manual ............................................ 481
5 Add 1 litre engine oil when
next refuelling....................................... 483
é ATTENTION ASSIST inoperative ....456
é ATTENTION ASSIS T:Take a
break!....................................................4 56:
Automatic driving lights inoper‐
ative...................................................... 438
Á Change key bat teries ...................4 34
J Checkbrake fluid le vel................. 455
5 Check engine oil le vel when
next refuelling....................................... 483
ï Checktrailer hitch lo ck................ 441
h Check tyre(s) ................................ 476
! Clean the fuel filter ...................... 448
J Close boot separator .................... 437
K Convertible Top Operation pos‐
sible to60 km/h................................... 436
ÿ Coolant Stop vehicle Switch
engine off..............................................4 46
! currently una vailable See Own‐
er's Manual ............................................ 467
÷ currently una vailable See Own‐
er's Manual .......................................... .468
5 Engine oil le vel cannot be
measured .............................................. 485 Index
509