battery MERCEDES-BENZ C-CLASS COUPE 2021 Owner's Guide

Ve
hicle Display messages
Possible causes/consequences and M
MSolutions
d Vehicle is operational
Switch off ignition before
exiting *Y
ou are leaving theve hicle in a ready-to-drive state. #
When you lea vetheve hicle, switch off the ignition, secure theve hicle against rolling away and take theke y with
yo u. #
Ifyo u do not lea vetheve hicle, switch off the electrical consumers, e.g. the seat heating. Otherwise, the12 ‑V
battery may discharge and starting the engine may be possible only with the help of a second battery (jump
st art).
ï
Check trailer hitch lock *T
he trailer hitch is not operational during a journey with a trailer. &
WARNING Risk of an accident if the ball neck is not loc ked
The trailer may become de tach ed. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Uncouple the trailer and secure it against rolling away. #
Initiate a new swivel mo vement and do not re-couple the trailer until thewa rning/indicator lamp goes out. #
Initiate a new swivel mo vement (/ page 227). #
When the display message disappears, couple up the trailer and drive on.
If th e display message does not disappear, the trailer hitch is malfunctioning and the ball neck is not loc ked. Display messages and
warning/indicator lamps 443

Display messages
Possible causes/consequences and M
MSolutions #
Consult a qualified specialist workshop.
Stop vehicle Leave engine
running Wait Transmission
cooling *T
he transmission is overheating. Pulling away may be temp orarily impaired or not possible. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Lea vethe engine running. #
Wait until the display message disappears before pulling away.
Auxiliary battery malfunc-
tion (whitedisplay mes‐
sage) *T
he auxiliary batteryforth e transmission is no longer being charge d. #
Consult a qualified specialist workshop. #
Untilthen, alw ays select park position jmanually before you swit choff the engine. #
Before leaving theve hicle, apply the electric parking brake.
Auxiliary battery malfunc-
tion (red display message) *T
he auxiliary batteryforth e transmission is no longer being charge d. #
Consult a qualified specialist workshop. #
Untilthen, alw ays select park position jmanually before you swit choff the engine. #
Before leaving theve hicle, apply the electric parking brake. 452
Display messages and warning/indicator lamps

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 *A
t least one of the main functions of the Mercedes me connect sy stem or of the Mercedes-Benz emer gency call
sy stem is malfunctioning. #
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. 474
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
*I fth e message appears while the engine is running, this indicates an on-board elect rical sy stem malfunction. #
Consult a qualified specialist workshop.
# See Owner's Manual *T
he12 V battery is not being charge d.
* NO
TEPossible engine damage if you continue driving #
Do not continue driving under any circum stances. #
Consult a qualified specialist workshop. #
Stop theve hicle immediately in accordance with the traf fic conditions and switch off the engine. #
Consult a qualified specialist workshop.
# Stop vehicle See Owner's
Manual *T
he12 V battery is no longer being charge d and thech arge leve l is too lo w.
* NO
TEPossible engine damage if you continue driving #
Do not continue driving under any circum stances. #
Consult a qualified specialist workshop. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Switch off the engine. #
Consult a qualified specialist workshop. Display messages and
warning/indicator lamps 475

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: 476
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 388).
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 477

1,
2, 3 ...
4MATIC Function................................................ 16 2
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.................................................... 216
Car e...................................................... .373
Fu nction................................................. 213
Opening the camera co ver (r eve rsing
camera)................................................. 216
Selecting a view..................................... 216
Setting favo urites.................................. .216
Switching au tomatic operation
on/off (r eversing camera).................... .216 A
A/C function Activating/deactivating (control
panel).................................................... 13 6
ABS (Anti-lock Braking Sy stem) .............. .177
Ac celeration
see Kickdown
Ac cess data
Editing (Blue tooth®
)...............................3 31
Setting (Blue tooth®
).............................. 330
Ac cident and Breakdown Manage‐
ment
Mercedes me connect.......................... .325
Ac oustic locking verification signal
Ac tivating/deactivating........................... 72
Ac tivating/deactivating automatic
vo lume adjustment
Ad vanced sound sy stem........................3 60
Burmes ter®
sur round sound sy stem..... 359
Ac tive Blind Spot Assi st
Brake application.................................. 204
Fu nction................................................ 202
Sy stem limitations................................. 202 Tr
ailer operatio n.................................... 204
Ac tive bonn et(pedestrian pr otection)
Operation.............................................. 362
Re setting...............................................3 62
Ac tive Brake Assi st
Fu nction/no tes..................................... 19 6
Setting................................................... 200
Ac tive Di stance Assist DISTRO NIC
Ac tive Emergency Stop Assis t............... 19 5
Calling up a spee d................................. 189
Fu nction................................................ 186
Increasing/decreasing speed................ 189
Ro ute-based speed adap tatio n.............. 191
Selecting............................................... 189
St oring a speed.....................................1 89
Switching off/deactivating.................... 189
Switching on/activating........................ 189
Sy stem limitations................................. 186
Ac tive Eme rgency Stop Assist ................ .195
Ac tive headlamps...................................... 124
Ac tive Lane Keeping Assist
Ac tivating/deactivating......................... 207
Ac tivating/deactivating thewa rning.... .208
Fu nction................................................ 205 502
Index

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 ®
.......................... 317
Ending.................................................... 318
No tes..................................................... 317
Overview................................................ 317
Sound settings....................................... 318
Tr ans ferred vehicle data........................3 20
Assistance sy stems
see Driving saf ety sy stem
ASS YST PLUS
Battery disconnection pe riods.............. 362
Displaying the service due dat e............. 361
Fu nction/no tes...................................... 361
Re gular maintenance work.................... 361
Special service requirements............... .361
ATA (anti-theft ala rmsystem)
Deactivating the alarm............................ 92 Fu
nction.................................................. 91
Fu nction of interior pr otection................. 93
Priming/deactivating interior pr otec‐
tion.......................................................... 93
Priming/deactivating tow- aw ay pro‐
te ction..................................................... 93
To w- aw ay protection function.................. 92
AT TENTION ASSI ST
Fu nction................................................. 181
Setting................................................... 183
Sy stem limitations................................. 181
At tention assistant
see ATTENTION ASSIST
Au dio mode
Connecting USB device s....................... 338
Co pyrights............................................. 336
Information............................................ 334
Inserting/re moving an SD car d............. 336
Media sea rch........................................ .342
Overview............................................... 338
Pa use and playback function................ .339
Selecting a track................................... 339
Selecting playba ckoptions.................... 339
Switching on media mode..................... 336
Tr ack list............................................... .339 Au
thorised workshop
see Qualified specialist workshop
Au tomatic distance control
see Active Dis tance Assi stDISTRONIC
Au tomatic driving lights ...........................12 2
Au tomatic engine start (ECO start/
sto p function)............................................ 15 2
Au tomatic engine stop (ECO start/
sto p function)............................................ 15 2
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
Au tomatic mir rorfo lding function
Ac tivating/deactivating......................... 13 4
Au tomatic transmission
DIRECT SELECT le ver............................. 157 Index
505

Drive program display............................
15 6
Drive programs...................................... 15 5
DY NA MIC SELECT switch...................... 15 5
Engaging drive position........................ .159
Engaging neutral................................... .158
Engaging park position.......................... 15 9
Engaging reve rsege ar........................... 15 8
Kickdown............................................... 161
Manual gear changing.......................... .160
St eering wheel gearshift paddles.......... 16 0
Tr ansmission position displa y................ 157
Tr ansmission position s..........................157
Au tomatic transmission (problem)
see Transmission (problem)
Axle load Perm issible............................................ 41 8
Tr ailer operation.................................... 432 B
Bad weather light...................................... 12 6
Bag hook..................................................... 11 4
Ball ne ck
Fo lding out/in....................................... 227
BA S (Brake Assist Sy stem)....................... 17 7Battery
Remo tecontrol (s tationary heater)........ 141
Battery see Battery (vehicle)
Battery (k ey)
Re placing.................................................73
Battery (vehicle) Charging................................................ 388
Charging (Remo teOnline)...................... 14 6
No tes....................................................3 85
No tes (s tarting assis tance and
ch arging)............................................... 386
Re placing.............................................. 390
St arting assis tance................................ 388
Belt see Seat belt
Bic ycle rack
Load capacity........................................ 431
Tr ailer operation.................................... 231
Blind Spot Assist Activating/deactivating......................... 205
Fu nction................................................ 202
Sy stem limitations................................. 202 Blo
wer
see Climate control
BlueTEC see AdBlue ®
Blue tooth ®
Information............................................ 265
Setting up an Internet connection.........3 30
Switching on/off.................................. .265
Switching profile (DUN/PAN)................ 331
Blue tooth ®
audio
Ac tivating.............................................. 346
De-authorising (de-regis tering) the
device.................................................... 347
Information...........................................3 44
Overview............................................... 345
Sear ching for a track............................. 347
Sear ching for and auth orisingthe
device.................................................... 345
Selecting a media pla yer....................... 346
Switching device via NFC...................... 347
Bonnet Resetting (active bonnet)...................... 362 506
Index

Car
wash
see Care
Car wash (care)......................................... 369
Care 360° camera......................................... 373
Air-water duct........................................ 369
Au tomatic car wash............................... 369
Carpe t.................................................... 374
Deco rative foil...................................... .372
Displ ay................................................... 374
Exterior lighting.................................... .373
High-pressu recleaner........................... 370
Matt finis h............................................. 371
Pa int wo rk.............................................. 371
Plastic trim............................................ 374
Re alwo od/trim elements......................3 74
Re versing camera................................. .373
Ro of lining.............................................. 374
Seat belt................................................ 374
Seat co ver............................................. 374
Senso rs................................................. 373
St eering wheel....................................... 374
Ta ilpipes................................................ 373
Tr ailer hit ch........................................... 373
Wa shing byhand................................... 371Wheels/rims.........................................
373
Wi ndo ws................................................ 373
Wi per blades.......................................... 373
Carpet (Care).............................................. 374
Changing gears
Manually. ............................................... 16 0
Changing hub caps .................................. .409
Charging Battery (vehicle).................................... 388
Chassis Damping characteristics....................... .208
DY NA MIC BODY CONTROL.................... 208
Child seat Appr oval categories................................ .58
At tach ing (no tes).....................................57
Basic instructions.................................... 53
Fr ont passenger seat (no tes)...................68
Fr ont passenger seat (without auto‐
matic airbag shutoff)...............................67
ISOFIX/i-Size (fitting)............................... 61
No tes on risks and dangers..................... 54
Re commended child restra int sy stems....56
Seats suitable for belt-secu redch ild
re stra int sy stems..................................... 65 Seats suitable
for i‑Size child
re stra int sy stems..................................... 61
Seats suitable for ISOFIX child
re stra int sy stems..................................... 60
Securing on the co-driver seat................69
Secu ring on there ar seat........................ 66
To pTe ther............................................... 64
Child ren
Av oiding dangers in theve hicle............... 54
Basic instructions.................................... 53
Cho ck
St orage location.................................... 408
Chock see Chock
CI+ module Calling up a menu................................. 358
Inserting the smart card........................ 357
City lighting ............................................... 12 6
Cleaning see Care
Climate control Activating/deactivating the A/C
function (cont rol panel)........................ .136 508
Index