2021 MERCEDES-BENZ C-CLASS CABRIOLET service

Display messages
Int
roduction In
fo rm ation about display messages
Displ aymessa ges appear on the multifunction
displa y.
Displ aymessa ges with graphical symbols are
simplified in the Owner's Manual and may dif fer
from the symbols on the multifunction displa y.
The multifunction display sho wshigh-priority dis‐
play messages in red. Cer tain display messages
are accompanied byawa rning tone.
Please act in acco rdance with the display mes‐
sages and follow the additional no tes in the
Owner's Manual.
Fo r some display messa ges, a symbol will also
be shown:
R Õ Further information
R ¨ Hide display message
Wi th th e left-hand Touch Control, you can select
th ere spective symbol byswiping tothe left or
ri ght. Press theÕ symbol toshow fur ther infor‐ mation on
the media displa y.Press the¨
symbol tohide the display message.
Yo u can hide lo w-priority display messages by
pressing theP back button or the left-hand
To uch Control. The displ aymessa ges will then
be stored in the message memor y.
Re ctify the cause of a display message as
qu ickly as possible.
High-priority display messages cannot be hid‐
den. The multifunction display sho wsthese dis‐
play messages continuously until the cause of
th e display message has been rectified.
Calling up sa ved displ aymessages
On-boa rdcompu ter:
4 Service 5
1 message
If th ere are no display messages, No messages
will appear on the multifunction displa y. #
Scroll thro ugh the display messages byswip‐
ing upwards or down wards on the left-hand
To uch Control. #
Toexitth e message memor y:press the
back button P. 430
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions &
WARNING Risk of bu rns when opening the bonn et
If yo u open the bonn etwhen the engine has overheated or when there is a fire inthe engine compartment, the
fo llowing situations may occur:
R You could come into contact with hot gases.
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 compartment, keep the bonn etclosed and call thefire service. #
Wait until the engine has cooled down. #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120°C.
ÿ *T
hefan mo tor is defective. #
Avoiding high loads on the engine, drive tothe nearest qualified specialist workshop. In doing so, ensure that
th e coolant temp erature display remains below 120 °C. Displ
aymessa ges and warning/indicator lamps 447

Mercedes me connect
Display messages
Possible causes/consequences and M
MSolutions
Mercedes me connect
Services limited See Own-
er's Manual *T
hevehicle functions forfa ult de tection are restricted.
At least one of the main functions of the Mercedes me connect sy stem is malfunctioning. #
Obser vethe no tes on the diagnostics connection (/ page 29). #
Consult a qualified specialist workshop.
G Inoperative *T
he Mercedes-Benz emer gency call sy stem malfunctioning The Mercedes me connect sy stem is also malfunction‐
ing. #
Consult a qualified specialist workshop. Battery
Display messages
Possible causes/consequences and M MSolutions
# 12 V battery See Owner's
Manual *T
he engine is off and thech arge leve l is too lo w. #
Switch off electrical consumers that are not required.
To charge the12 V battery: #
Lea vethe engine running for a few minutes, or drive an extended di stance. 472
Displaymessa ges and warning/indicator lamps

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
R The coolant pump is faulty
If th ere is an additional warning tone, the coolant temp erature has exceeded 120°C. &
WARNING Risk of bu rns when opening the bonn et
If yo u open the bonn etwhen the engine has overheated or when there is a fire inthe engine compartment, the
fo llowing situations may occur:
R You could come into contact with hot gases.
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 compartment, keep the bonn etclosed and call thefire service. #
Stop theve hicle immediately in accordance with the traf fic conditions and switch off the engine. Do not continue
driving. #
Notethe messages on the multifunction displa y.
If th e coolant temp erature display is at the lo wer end of thete mp erature scale: #
Consult a qualified specialist workshop.
If th e coolant temp erature display is at the upper end of thete mp erature scale: #
Exit theve hicle and keep a safe dis tance from it until the engine has cooled down. #
Check the coolant le vel (/ page 361). 490
Display messages and warning/indicator lamps

Ad
justing treble, mid-range and bass
setting s................................................. 353
Calling up the sound menu.................... 353
Information............................................ 353
Switching volume adjustment on/of f.... 353
Af ter-sales service centre
see ASS YST PLUS
Air distribution Setting................................................... 13 3
Air inlet see Air-water duct
Air pressu re
see Tyre pressure
Air suspension see AIRMATIC
Air vents
Ad justing (front).................................... 13 5
Ad justing (rear)..................................... .135
Ad justing the AIRSCARF vents............... 13 6
Air vents
see Air vents
Ai r-conditioning sy stem
see Climate control Air-recirculation mode..............................
13 4
Air-water duct Keeping free.......................................... 362
Airbag Activation................................................ 38
Fr ont airbag (driver, front passenger)...... 44
Head airba g............................................. 44
Ins tallation locations.............................. .44
Knee airbag............................................ .44
Overview................................................. 44
PA SSENGER AIR BAG indicator lamp....... 49
Pr otection................................................ 45
Re duced pr otection.................................46
Side airba g.............................................. 44
AIR CAP
Ac tivating................................................ 84
Deactivating............................................ 84
Airflow Setting................................................... 13 3
AIRM ATIC
Setting.................................................. .202
Suspension............................................ 201
AIRSCARF Adjusting the outlets............................. 13 6Switching on/of
f................................... 105
Alarm sy stem
see ATA (anti-theft alarm sy stem)
All-wheel drive see 4MATIC
Alternative route
see Route
Ambient lighting Setting (MBUX multimedia sy stem)....... 127
Android Auto
Connecting a mobile phone (wireless).. .312
Ending.................................................... 312
Information............................................ 312
Overview................................................3 11
Sound settings....................................... 312
Tr ans ferred vehicle data........................3 13
Animals Pets in theve hicle................................... 71
Anti-lock braking sy stem
see ABS (Anti-lock Braking Sy stem)
Anti-skid chains
see Snow chains 502
Index

Anti-theft pr
otection
Ad ditional door loc k................................ 75
Immobiliser............................................. 92
Anti-theft pr otection
see ATA (anti-theft alarm sy stem)
Anticipatory occupant pr otection
see PRE- SAFE®
(anticipatory occu‐
pant pr otection)
see PRE-SAFE ®
PLUS (anticipatory
occupant pr otection plus)
Apple CarPlay ®
Connecting an iPhone ®
.........................3 10
Ending.................................................... 311
No tes..................................................... 310
Overview................................................ 310
Sound settings....................................... 311
Tr ans ferred vehicle data........................3 13
Assistance sy stems
see Driving saf ety sy stem
ASS YST PLUS
Battery disconnection pe riods.............. 355
Displaying the service due dat e............. 354
Fu nction/no tes..................................... 354
Re gular maintenance work.................... 354 Special service
requirements............... .354
ATA (anti-theft ala rmsystem)
Deactivating the alarm............................ 93
Fu nction.................................................. 92
Fu nction of interior pr otection................. 93
Priming/deactivating interior pr otec‐
tion..........................................................94
Priming/deactivating tow- aw ay pro‐
te ction..................................................... 93
To w- aw ay protection function.................. 93
AT TENTION ASSI ST
Fu nction................................................. 174
Setting................................................... 176
Sy stem limitations................................. 174
At tention assistant
see ATTENTION ASSIST
Au dio mode
Connecting USB device s....................... 331
Co pyrights............................................. 329
Information............................................ 327
Inserting/re moving an SD car d............. 329
Media sea rch........................................ .335
Overview............................................... 331
Pa use and playback function................ .332 Selecting a track................................... 332
Selecting playba
ckoptions.................... 332
Switching on media mode..................... 329
Tr ack list............................................... .332
Au thorised workshop
see Qualified specialist workshop
Au tomatic distance control
see Active Dis tance Assi stDISTRONIC
Au tomatic driving lights ...........................12 0
Au tomatic engine start (ECO start/
sto p function)............................................ 14 5
Au tomatic engine stop (ECO start/
sto p function)............................................ 14 5
Au tomatic front passen ger front air‐
bag deacti vation sy stem
see Automatic front passenger front
airbag shutoff
Au tomatic front passen ger front air‐
bag shu toff
Fu nction of the automatic front
passenger front airbag deactivation
sy stem..................................................... 47
PA SSENGER AIR BAG indicator lamp....... 49 Index
503

Cruise control
Activating.............................................. 17 7
Buttons.................................................. 17 7
Calling up a spee d................................. 17 7
Deactivating.......................................... 17 7
Fu nction................................................. 176
Re quirements........................................ 17 7
Selecting............................................... 17 7
Setting a speed...................................... 17 7
St oring a speed.....................................1 77
Sy stem limitations................................. 176D
Dashboa rd
see Cockpit
Data acquisition Vehicle.................................................... 33
Data import/export Function/no tes..................................... 262
Importing/exporting............................. 263
Data pr otection rights
Data storage............................................ 36
Data storage
Data pr otection rights............................. 36 Electro
nic control units.......................... .33
Online services........................................35
Ve hicle.................................................... 33
Date Setting the time and date automati‐
cally....................................................... 257
Deactivating the alarm (A TA )...................... 93
Deale rship
see Qualified speciali stwo rkshop
Declaration of conformity Electromagnetic compatibility.................25
Jack......................................................... 28
Specific absor ption rate.......................... 25
TIREFIT kit............................................... 29
Wi reless vehicle components.................. 25
Decorative foil (cleaning instructions) .... 365
DeNOx agent see AdBlue ®
De stination
Editing intermediate destinations......... .274
Editing the pr evious destinations.......... 285
Ex tern al................................................. 285
Saving (cur rent vehicle position)........... 285 Saving as a
favo urit e............................. 285
Saving asglobal favo urit e...................... 285
St oring a map position..........................2 85
Dest ination entry
En tering a 3 wordaddress..................... 275
Entering a POI or address...................... 270
Entering an intermedia tedestination.....2 74
Entering geo-coordinates....................... 275
Selecting a contact................................ 275
Selecting a POI...................................... 273
Selecting from the map......................... 276
Selecting pr evious destinations............ .273
De tecting inat tentiveness
see ATTENTION ASSIST
Diagnostics connection .............................. 29
Diesel Low outside temp eratures..................... 419
No tes..................................................... 419
Digital Owner's Manual .............................. 20
Digital TV
see TV
Dinghy towing
see Tow- bar sy stem 508
Index

App
lybrake todeselect Park (P)
position................................................. 449
App lybrake toselect R......................... 449
Au xilia rybattery malfunction (red
display message) ...................................4 51
Au xilia rybattery malfunction (white
display message) ...................................4 51
Beginning eme rgency stop.................... 460
Blind Spot Assist cur rently una vaila‐
ble See Owner's Manual ........................ 461
Blind Spot Assist inope rative ................. 462
Blind Spot Assi stnot available when
to wing a trailer See Owner's Manual .....4 62
Cannot start engine See Owner's
Manual................................................. .475
Check brake pads See Owner's Man‐
ual ........................................................ .455
Che cktyre pressu resth en restart
Ru n Flat Indicator................................. .479
Cruise control and Limi ter inoperative.. 457 Cruise control inoperative..................... 457
Cruise control off.................................. 457
Fr ont-passenger airbag disabled See
Owner's Manual....................................4 32
Fr ont-passenger airbag enabled See
Owner's Manual....................................4 32
Hazard warning lamps malfunctioning.. .441
Limiter inoperative................................ 457
Limiter passive ...................................... 457
Mercedes me connect Services limi‐
te d See Owner's Manual........................4 72
Mo tor can be star ted again.................... 475
N permanently active Risk of vehicle
ro lling .................................................... 449
Only select Park (P) when vehicle is
st ationary.............................................. 448
Pa rking Assist and PARKTRONIC
inoperative See Owner's Manual ...........466
Pa rking Assist Manoeuvring assis‐
ta nce limited See Owner's Manual........ 466 Place
theke y in the mar ked space
See Owner's Manual............................. 435
PRE-SAFE inoperative See Owner's
Manual..................................................4 33
Ra dar sensors dirty See Owner's
Manual................................................... 471
Re duce speed ........................................ 478
Re versing not poss. Consult work‐
shop......................................................4 50
Risk of vehicle rolling Driver door
open and transmission not in P............. 449
Ru n Flat Indicator inope rative............... .479
Speed limit (winter tyres) XXX km/h..... 459
St op vehicle Lea veengine running
Wa itTransmission cooling .....................450
To shift out of P or N,depress brake
and start engine.................................... 449
To switch off the engine, press
St art/ Stop button for at least 3 sec‐
onds or 3 times. ................................... .446 512
Index