sensor MERCEDES-BENZ C-CLASS CABRIOLET 2021 Service Manual

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

Display messages
Possible causes/consequences and M
MSolutions &
WARNING Thereis a risk of an accident if the tyre pressure monitoring sy stem is malfunctioning
The tyre pressure monitoring sy stem cann otissue a warning if there is pressure loss in one or more of the
tyres.
Ty res with insuf ficient tyre pressure may impair the driving characteristics as well as steering and braking. #
Have the tyre pressure monitoring sy stem checked at a qualified specialist workshop. Tyre press. monitor inoper-
ative No wheel sensors
*T
he wheels fitted do not ha vesuitable tyre pressure sensors. The tyre pressure monitoring sy stem is deactivated. #
Fit wheels with suitable tyre pressure sensors.
h
Wheel sensor(s) missing *T
here is no signal from the tyre pressure sensor of one or more wheels. Nopressure value is displa yedfo rthe
af fected tyre. #
Have thefa ulty tyre pressure sensor replaced at a qualified specialist workshop.
h Check tyre(s) *T
he tyre pressure in one or more tyres has dropped significantl y.
The wheel position is displa yed. A warning tone also sounds. &
WARNING Risk of an accident due toinsuf ficient tyre pressure
R The tyres can bu rst.
R The tyres can wearexc essively and/or une venly. 476
Displaymessa ges and warning/indicator lamps

Display messages
Possible causes/consequences and M
MSolutions
5 Engine oil pressure Stop
Switch off engine *D
isplay message only for cer tain engines:
The oil pressure is too lo w.
* NO
TEEngine dama gecaused bydriving with insuf ficient oil pressure #
Avoid driving with insuf ficient oil pressure. #
Stop theve hicle immediately in accordance with the traf fic conditions. Do not continue driving. #
Switch off the engine. #
Consult a qualified specialist workshop.
5 Engine oil level cannot be
measured *T
he electrical connection tothe oil le vel sensor has been inter rupte d or the oil le vel sensor is faulty. #
Consult a qualified specialist workshop. Wa
rning and indicator lamps Overview of indicator and
warning lamps Some sy
stems will per form a self-test when the
ignition is switched on. Some indicator and wa
rning lamps may briefly light up or flash. This
behaviour is non-critical. These indicator and
wa rning lamps indicate a malfunction only if they
light up or flash af terth e engine has been star‐
te d or during a journe y. Displ
aymessa ges and warning/indicator lamps 485

Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
ï Tr ailer tow hit chwarning
lamp *T
hered trailer hitch warning lamp is lit.
The trailer hitch is not operational. &
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. #
Notethe messages on the multifunction displa y.Engine
Wa
rning/indicator lamp
Possible causes/consequences and M
MSolutions
ÿ Coolant warning lamp *T
he red coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The coolant le vel is too low
R The air supply tothera diator is obstructed
R The radiator fan is faulty Display messages and
warning/indicator lamps 489

É
Stop vehicle Vehicle too low......... 465
ç suspended...................................4 58
: Switch off lights ........................... 439
: Switch on headla mps................... 439
K Top lo wering................................. 436
Ø Top up AdBlue Emergency op.
in XXX miles See Owner's Manual......... 480
+ Top up coolant See Owner ’s
Manual.................................................. 446
¥ Top up washer fluid ...................... 445
! Turn on the ignition torelease
th e parking brake..................................4 55
d Vehicle is operational Switch
off ignition before exiting....................... 441
É Vehicle rising Please wait............ .466
É Vehicle rising................................4 66
h Warning tyre defect..................... .477
h Wheel sensor(s) missing ...............476
K While stationar y,apply the
brakes before operating the soft top.....4 36 Ø
XX,X l Top up AdBlue Switch on
ignition, wait 60 sec. or eng. start
not poss................................................ .481
Ac tive Blind Spot Assi stcur rently
una vailable See Owner's Manual ...........462
Ac tive Blind Spot Assi stinope rative ...... 462
Ac tive Blind Spot Assi stnot available
when towing a trailer See Owner's
Manual .................................................. 463
Ac tive bonnet malfunction See Own‐
er's Manual........................................... 443
Ac tive Brake Assi stFunctions cur‐
re ntly limited See Owner's Manual ........470
Ac tive Brake Assi stFunctions limited
See Owner's Manual.............................. 471
Ac tive Dis tance Assi stavailable again ...4 59
Ac tive Dis tance Assi stcur rently
una vailable See Owner's Manual ...........458
Ac tive Dis tance Assi stinope rative ........ 458 Ac
tive Lane Keeping Assist Camera
view restricted See Owner's Manual..... 463
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual ...........463
Ac tive Lane Keeping Assist inopera‐
tive........................................................ 463
Ac tive Steering Assist cur rently
una vailable due tomultiple emer‐
ge ncy stops...........................................4 60
Ac tive Steering Assist cur rently
una vailable See Owner's Manual ...........459
Ac tive Steering Assist inoperative ......... 459
Ad aptive Highbeam Assist Plus Cam‐
era view restricted See Owner's
Manual.................................................. 440
Ad aptive Highbeam Assist Plus cur‐
re ntly una vailable See Owner's Man‐
ual......................................................... 440
Ad aptive Highbeam Assist Plus inop‐
erative.................................................. .440 Index
511

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

Tr
af fic Sign Assi stCamera view
re stricted See Owner's Manual.............. 461
Tr af fic Sign Assi stcur rently una vaila‐
ble See Owner's Manual ........................ 460
Tr af fic Sign Assi stinope rative ................ 461
Tr ansmission Malfunction Stop............. 450
Ty re press. monitor cur rently una vail‐
able ...................................................... .475
Ty re press. monitor inoperative.............4 75
Ty re press. monitor inoperative No
wheel sensors ........................................ 476
Ty re pressure Check tyres .....................479
Ty re(s) ove rheated................................. 478
Wi thout changing gear, consult work‐
shop......................................................4 50
Display on the windscreen
see Head-up display
Distance control see Active Dis tance Assi stDISTRONIC
DI STRO NIC
see Active Dis tance Assi stDISTRONIC Door
Additional door loc k................................ 75
Locking/unlocking (emergency key)....... 79
Opening (from inside ).............................. 76
Un locking (from inside)............................ 76
Door cont rol panel....................................... 16
Draught stop
Car e...................................................... .367
Dr aw bar
see Tow- bar sy stem
Drive Away Assist ...................................... 218
Drive Away Assist
see Pr otection against collision
Drive position Enga ging................................................1 52
Drive prog ram display ............................... 14 9
Drive prog rams
see DYNA MIC SELECT
Driver's seat see Seat
Driving abroad Light adjustment (low beam)..................1 19Driving saf
ety sy stem
ABS (Anti-lock Braking Sy stem).............1 70
Ac tive Brake Assi st................................ 189
Ad aptive brake lights............................. 174
BA S (Brake Assi stSystem).................... 17 0
Cameras............................................... .168
EBD (Electronic Brake forc e Distribu‐
tion).......................................................1 72
ESP ®
Crosswind Assi st.......................... 171
ESP ®
trailer stabilisation........................ 172
Overview............................................... 16 9
Ra dar and ultrasonic sensor s................ 16 8
Re sponsibility........................................1 68
ST EER CONTROL................................... 172
Driving sy stem
DY NA MIC BODY CONTROL.................... 201
Driving sy stem
see 360° Camera
see Active Blind Spot Assi st
see Active Dis tance Assi stDISTRONIC
see Active Emergency Stop Assist
see Active Lane Keeping Assist
see Active Parking Assist
see Active Speed Limit Assi st
see Active Steering Assist Index
513

Calling up.............................................. 252
Deleting................................................. 252
Moving................................................. .252
Overview................................................ 251
Re naming.............................................. 252
Fi lling station sear ch
St arting automatic sear ch..................... 273
Switching the automatic sear chon/
off.........................................................2 79
Using auto matic search......................... 279
Fire extinguisher....................................... 373
Fi rs t-aid kit (soft sided) ............................373
Flat towing
see Tow- bar sy stem
Flat tyre MOEx tended tyres................................. 375
No tes..................................................... 374
TIREFIT kit..............................................3 76
Wheel chang e....................................... .405
Floor mats.................................................. 11 8
Fo g light (enhanced) .................................1 23
Fo il co vering
Ra dar and ultrasonic sensor s................16 8Fo
lding draught stop
Car e...................................................... 368
Fitting...................................................... 85
Re moving............................................... .85
Fr ee software.............................................. 36
Fr equencies
Tw o-w ayradio........................................ 413
Fr ont airbag................................................. 44
Fr ont passenger seat
see Seat
Fu el
Ad ditives................................................ 419
Diesel..................................................... 419
E1 0........................................................ 41 8
Fu elreser ve........................................... 421
Low outside temp eratures..................... 419
Pe trol..................................................... 41 8
Quality (diesel )....................................... 419
Quality (petrol)....................................... 41 8
Re fuelling.............................................. 15 5
Sulphur content..................................... 41 8
Ta nk content.......................................... 421
Fu nction seat
see Door cont rol panel Fu
ses
Before replacing a fuse.......................... 391
Fu se assignment diagram...................... 391
Fu se box in the boot.............................. 394
Fu se box in the engine compartmen t.... 392
Fu se box in the front passenger foot‐
we ll....................................................... .394
Fu se box on the dashboard................... 393
No tes..................................................... 391 G
Garage door opener Cleari ngthe memory.............................1 64
Programming buttons............................ 16 2
Re solving problems...............................1 64
Synchronising thero lling code............. .163
Garage door openers Opening/closing the door.....................1 64
Gearshift recommendation..................... .153
Gene ral operating permit number (EU)... 414
Genuine parts.............................................. 22
Genuine wood (Care) ................................ 369
Glide mode................................................ .154 516
Index

Saf
etyve st................................................. 372
Satellite map............................................. 295
SD card Inserting/re moving.............................. .329
Seat 4-waylumbar suppor t............................. 99
Ad justing (electrically)............................ .99
Ad justing (manually and electrically)....... 96
Ad justing (Seat Comfort)........................ .98
Con figuring the settings........................ 101
Cor rect driver's seat position.................. 95
Fo lding back the backrest (rear)............ 11 4
Fo lding the backrest forw ards (rear)...... 11 3
Fo lding the backrest forw ards/back
(with memory function)........................ .102
Fo lding the backrest forw ards/back‐
wa rds (without memory function)..........1 02
Operating the memory function.............1 10
Re setting the settings............................1 02
Setting options........................................ 16
Switching AIRSCARF on/of f.................. 105
Seat belt Activating/deactivating seat belt
adjustment.............................................. 43 Ca
re...................................................... 369
Fa stening................................................. 42
Pr otection................................................ 39
Re ar seat belt status displa y................... 43
Re duced pr otection.................................40
Re leasing................................................ .43
Seat belt adjustment (function)............... 43
Seat belt extende r................................... 41
Wa rning lamp.......................................... 43
Seat belt adju stment
Ac tivating/deactivating........................... 43
Fu nction.................................................. 43
Seat belt extender ....................................... 41
Seat belt tensioners
Ac tivation................................................ 38
Seat belt warning
see Seat belt
Seat co ver (Care)....................................... 369
Seat hea ter
Ac tivating/deactivating......................... 103
Seat ventilation
Switching on/o ff................................... 104Second
telephone
Connecting........................................... .299
Fe atures................................................ 299
Selecting a gear
see Changing gears
Selector le ver
see DIRECT SELECT le ver
Self-test Automatic front passenger front air‐
bag shutoff............................................. .49
Sensors (care) ...........................................3 68
Service see ASS YST PLUS
Service centre see Qualified specialist workshop
Service inter val display
see AS SYST PLUS
Service station sear ch
St arting automatic sear ch..................... 280
Setting a speed see Cruise control
Setting summer time ................................ 257528
Index

St
arting (Remo teOnline).......................1 40
St arting (s tart/s top button).................. 13 8
SV HC (subs tances of very high con‐
cern)........................................................ 31
Switching off (s tart/s top button)...........1 61
To wing.................................................. .225
Ve ntilating (co nvenience opening)........... 90
Vo ice commands (LINGU ATRO NIC)....... 24 4
Ve hicle camera
Information............................................ 16 8
Ve hicle data
Displ aying (DYNAMIC SELECT).............. 15 0
Ro of load............................................... 427
Tr ans ferring toAndroid Auto.................. 313
Tr ans ferring toApple CarPl ay®
.............. 313
Ve hicle height........................................4 26
Ve hicle length........................................4 26
Ve hicle width.........................................4 26
Wheelbase............................................. 426
Ve hicle dimensions ................................... 426
Ve hicle identification number
see VIN
Ve hicle identification plate
EU general operating pe rmit number.... .414 Pa
int code............................................. .414
Pe rm issible axle load............................ .414
Pe rm issible gross mass......................... 414
VIN.........................................................4 14
Ve hicle interior
Cooling or heating (Remo teOnline).......1 39
Ve hicle key
see Key
Ve hicle location
Ac tivating/deactivating transmission.... 258
Ve hicle maintenance
see ASS YST PLUS
Ve hicle sensors
Information............................................ 16 8
Ve hicle tool kit
TIREFIT kit............................................. .376
To wing eye............................................ 390
Ve ntilating
Con venience opening.............................. 90
Ve ntilation
see Climate cont rol
Ve nts
see Air vents Vi
deo mode
Ac tivating.............................................. 333
Ac tivating/deactivating full-screen
mode..................................................... 334
Overview............................................... 334
Setting s................................................. 335
VIN Identification plate................................. 414
Seat....................................................... 414
Wi ndsc reen............................................ 414
Vi sion
Demisting windo ws............................... 13 4
Vo ice command types (LINGUA‐
TRONIC)...................................................... 233
Vo ice control sy stem
see LINGU ATRO NIC W
Wa rning lamp
see Warning/indicator lamp
Wa rning sy stem
see ATA (anti-theft alarm sy stem) 536
Index