2021 MERCEDES-BENZ C-CLASS CABRIOLET battery

Display messages
Possible causes/consequences and M
MSolutions
# Stop vehicle Leave engine
running *T
he12 V battery charge leve l is too lo w. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Lea vethe engine running. #
Ifth e display message disappears: drive on. #
Ifth e display message does not disappear: consult a qualified specialist workshop.
Û 48 V battery See Owner's
Manual *T
he 48 V on-board electrical sy stem has function restrictions. Comfort functions may be restricted. #
Consult a qualified specialist workshop immediatel y.
Ý
Please wait 48 V battery
charging *T
he 48 V battery is dischar ged. You ha veswitched on the ignition while the12 V battery was being charge d with a
suitable charge r or while ano ther vehicle was pr oviding starting assis tance.
The discha rged 48 V battery is charge d automatically via thevo ltage con verter. Af ter a few minutes, theMotor can
be started again display message will be shown on the multifunction displa y. #
Start theve hicle. #
Drive theve hicle for a while tocharge the12 V battery and the 48 V battery af ter disconnecting thech arger
from theve hicle.
If th eMotor can be started again display message does not appear af ter a few minutes: 474
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions #
Tryto start theve hicle. #
Ifth eve hicle does not start, consult a qualified specialist workshop.
Cannot start engine See
Owner's Manual *T
hestate of charge ofthe 48 V battery is too lo w.You can no lon gerst art theve hicle. #
Switch off electrical consumers that are not required. #
Connect a suitable charge r appro vedfo r Mercedes-Benz with suf ficient charge output tothe jump-s tart connec‐
tion point of the12 V battery (/ page 384).
The 48 V battery is charge d via thevo ltage con verter in theve hicle.
Motor can be started again *T
he 48 V battery has been charge d automatically via thevo ltage con verter. #
Start theve hicle and drive for a while tocharge the12 V battery and the 48 V batter y. Ty
re pressure moni tor Display messages
Possible causes/consequences and M MSolutions
Tyre press. monitor cur-
rently unavailable *T
here is inter fere nce from a po werful radio signal source. As a result, no signals from the tyre pressure sensors are
being recei ved. The tyre pressure monitoring sy stem is temp orarily una vailable.
The tyre pressure monitoring sy stem will restart automatically as soon as the cause has been rectified. #
Drive on.
Tyre press. monitor inoper-
ative *T
he tyre pressure monitoring sy stem is malfunctioning. Display messages and
warning/indicator lamps 475

1,
2, 3 ...
4MATIC Function................................................ 15 5
12 V battery
see Battery (vehicle)
12 V so cket
see Soc ket (12 V)
48 V on-board electrical sy stem
see EQ Boo sttech nology
360° Came ra
Button................................................... 209
Ca re...................................................... 368
Fu nction................................................ 206
Opening the camera co ver (r eve rsing
camera)................................................. 209
Selecting a view................................... .209
Setting favo urites.................................. 209
Swit ching automatic operation
on/off (r eversing camera).................... .209 A
A/C function Activating/deactivating (control
panel).................................................... 13 4
ABS (Anti-lock Braking Sy stem) .............. .170
Ac celeration
see Kickdown
Ac cess data
Editing (Blue tooth®
)...............................3 24
Setting (Blue tooth®
).............................. 323
Ac cident and Breakdown Manage‐
ment
Mercedes me connect.......................... .318
Ac oustic locking verification signal
Ac tivating/deactivating........................... 73
Ac tivating/deactivating automatic
vo lume adjustment
Ad vanced sound sy stem........................3 53
Burmes ter®
sur round sound sy stem..... 352
Ac tive Blind Spot Assi st
Brake application................................... 197
Fu nction................................................ 19 5
Sy stem limitations................................. 19 5Tr
ailer operatio n.................................... 197
Ac tive bonn et(pedestrian pr otection)
Operation.............................................. 355
Re setting...............................................3 55
Ac tive Brake Assi st
Fu nction/no tes..................................... 189
Setting................................................... 19 3
Ac tive Di stance Assist DISTRO NIC
Ac tive Emergency Stop Assis t............... 188
Calling up a spee d................................. 182
Fu nction................................................ 17 9
Increasing/decreasing speed................ 182
Ro ute-based speed adap tatio n.............. 184
Selecting............................................... 182
St oring a speed.....................................1 82
Switching off/deactivating.................... 182
Switching on/activating........................ 182
Sy stem limitations................................. 17 9
Ac tive Eme rgency Stop Assist ................ .188
Ac tive headlamps...................................... 12 2
Ac tive Lane Keeping Assist
Ac tivating/deactivating......................... 200
Ac tivating/deactivating thewa rning...... 201
Fu nction................................................ 19 8500
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

Au
tomatic mir rorfo lding function
Ac tivating/deactivating......................... 13 2
Au tomatic transmission
DIRECT SELECT le ver............................. 15 0
Drive program display............................ 14 9
Drive programs...................................... 14 8
DY NA MIC SELECT switch...................... 14 8
Engaging drive position........................ .152
Engaging neutral................................... .151
Engaging pa rkposition.......................... 15 2
Engaging reve rsege ar........................... .151
Kickdown............................................... 154
Manual gear changing.......................... .153
St eering wheel gearshift paddles.......... 15 3
Tr ansmission position displa y................ 15 0
Tr ansmission position s..........................15 0
Au tomatic transmission (problem)
see Transmission (problem)
Axle load Perm issible............................................ 414
Tr ailer operation.................................... 429 B
Bad weather light...................................... 124Ball ne
ck
Fo lding out/in....................................... 220
BA S (Brake Assist Sy stem)....................... 17 0
Battery see Battery (vehicle)
Battery (k ey)
Re placing.................................................74
Battery (vehicle) Charging................................................ 384
Charging (Remo teOnline)...................... 13 9
No tes..................................................... 381
No tes (s tarting assis tance and
ch arging)............................................... 382
Re placing.............................................. 386
St arting assis tance................................ 384
Belt see Seat belt
Bic ycle rack
Load capacity........................................ 428
Tr ailer operation.................................... 224
Blind Spot Assist Activating/deactivating......................... 19 8
Fu nction................................................ 19 5Sy
stem limitations................................. 19 5
Blo wer
see Climate control
BlueTEC see AdBlue ®
Blue tooth ®
Information............................................ 258
Setting up an Internet connection.........3 23
Switching on/off.................................. .258
Switching profile (DUN/PAN)................ 324
Blue tooth ®
audio
Ac tivating.............................................. 339
De-authorising (de-regis tering) the
device.................................................... 340
Information............................................ 337
Overview............................................... 338
Sear ching for a track............................. 340
Sear ching for and auth orisingthe
device.................................................... 338
Selecting a media pla yer....................... 339
Switching device via NFC...................... 340
Bonnet Resetting (active bonnet)...................... 355 504
Index

Car
key
see Key
Car wash
see Care
Car wash (care)......................................... 362
Care 360° camera......................................... 368
Air-water duct........................................3 62
Au tomatic car wash............................... 362
Carpe t.................................................. .369
Decorative foil...................................... .365
Displ ay.................................................. 369
Draught stop......................................... 367
Exterior lighting..................................... 368
Fo lding draught stop.............................3 68
High-p ressure cleaner........................... 364
Matt finis h............................................. 364
Pa int wo rk.............................................. 364
Plastic trim............................................ 369
Re alwo od/trim elements..................... 369
Re versing camera................................. .368
Ro of lining.............................................3 69
Seat belt............................................... .369
Seat co ver............................................. 369
Senso rs................................................. 368 Soft
top................................................. 366
St eering wheel...................................... 369
Ta ilpipes................................................ 368
Tr ailer hit ch........................................... 368
Wa shing byhand................................... 364
Wheels/rims.........................................3 68
Wi nd de flector.......................................3 66
Wi ndo ws................................................ 368
Wi per blades.........................................3 68
Carpet (Care)............................................. 369
Changing gears
Manually. ............................................... 15 3
Changing hub caps .................................. .405
Charging Battery (vehicle).................................... 384
Chassis Damping characteristics....................... .201
DY NA MIC BODY CONTROL.................... 201
Child seat Appr oval categories................................ .58
At tach ing (no tes).....................................58
Basic instructions.................................... 53
Fr ont passenger seat (no tes)...................69 Fr
ont passenger seat (without auto‐
matic airbag shutoff)...............................68
ISOFIX/i-Size (fitting).............................. 62
No tes on risks and dangers..................... 54
Re commended child restra int sy stems.... 57
Seats suitable for belt-secu redch ild
re stra int sy stems..................................... 65
Seats suitable for i‑Size child
re stra int sy stems..................................... 62
Seats suitable for ISOFIX child
re stra int sy stems..................................... 60
Securing on the co-driver seat................70
Secu ring on there ar seat........................ 67
To pTe ther............................................... 64
Child ren
Av oiding dangers in theve hicle............... 54
Basic instructions.................................... 53
Cho ck
St orage location.................................... 404
Chock see Chock
CI+ module Calling up a menu..................................3 51
Inserting the smart card........................ 350 506
Index

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

5
Engine oil le velRe duce oil le vel.... 484
5 Engine oil le velSt op vehicle
Switch engine off.................................. 484
5 Engine oil pressure Stop
Switch off engine.................................. 485
ä Fault Drive at max. 80 km/h........ 464
6 Front left malfunction Consult
wo rkshop (e xample).............................. 431
_ Front left seat backrest not
loc ked (e xamp le).................................. .445
! inoperative See Owner's Man‐
ual......................................................... 468
÷ inoperative See Owner's Man‐
ual......................................................... 469
T inoperative See Owner's Man‐
ual......................................................... 470
G Inoperative................................... 472
: Intellige nt Light Sy stem inoper‐
ative...................................................... 439 Á
Key not de tected (red displ ay
messa ge)............................................... 435
Á Key not de tected (white displ ay
messa ge)............................................... 434
: Left dipped beam (e xamp le)........ .438
6 Left wind owbag malfunction
Consult workshop (e xample)................ .431
¢ Lowe ring...................................... 465
: Malfunction See Owner's Man‐
ual......................................................... 438
ð Maximum speed exceeded ........... 459
Ø ..................................................... 480
ç Off................................................4 58
ë Off................................................ 456
K Open/close top comple tely.......... 437
! Parking brake See Owner's
Manual .................................................. .451
É Please reduce speed .................... 466
Ý Please wait 48 V battery charg‐
ing ........................................................ .474 _
Rear left seat backrest not
loc ked (Example)................................... 445
h Rectify tyre pressure.................... 477
Ø Refill Ad Blue See Owne r’s
Manual.................................................. 480
! Release parking brake .................. 454
¸ Replace air cleaner ......................448
Á Replace key.................................. 434
8 Reser vefuel le vel......................... 448
6 Restra int sys. malfunction Con‐
sult workshop........................................ 431
# See Owner's Manual....................4 73
Ù Steering malfunction Incre ased
ph ysical ef fort See Owner's Manual ......443
Ù Steering malfunction Stop
immediately See Owner's Manual .........443
# Stop vehicle Lea veengine run‐
ning ........................................................ 474
# Stop vehicle See Owner's Man‐
ual......................................................... 47351 0
Index