sensor MERCEDES-BENZ C-CLASS ESTATE 2020 Service Manual

Display messages
Possible causes/consequences and M MSolutions #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra ffic conditions and restart
th e engine. #
If necessar y,clean there ar bumper. If the bumper is especially dirty, the sensors in the bumper may be mal‐
functioning.
Blind Spot Assist inopera-
tive *B
lind Spot Assist is malfunctioning. #
Consult a qualified specialist workshop.
Blind Spot Assist not availa-
ble when towing a trailer
See Owner's Manual *W
hen you es tablish the electrical connection tothe trailer, Blind Spot Assist will be una vailable. #
Press the left-hand Touch Control and ackn owledge the display message.
Active Blind Spot Assist
currently unavailable See
Owner's Manual *A
ctive Blind Spot Assi stistemp orarily una vailable.
The sy stem limits ha vebeen reached (/ page219).
Once the cause of the problem is no longer present, the sy stem will be available again. #
Drive on.
or #
Ifth e display message does not disappear, stop theve hicle in accordance with the tra ffic conditions and restart
th e engine.
Active Blind Spot Assist
inoperative *A
ctive Blind Spot Assi stis malfunctioning. #
Consult a qualified specialist workshop. 482
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M MSolutions
É Vehicle rising *Y
our vehicle is adjusting tothe le velyo u ha veselected.
É Vehicle rising Please wait *T
hevehicle le vel is too lo w.The vehicle will be raised tothe selected vehicle le vel. #
Wait until the display message disappears before pulling away.
É Please reduce speed *Y
ou are driving toofast forth e selected vehicle le vel. #
Toadjust theve hicle le vel,yo u must not drive at speeds greaterth an 60 km/h. #
Toadjust theve hicle le vel during trailer operation, you must not drive at speeds greaterth an 30 km/h.
Active Parking Assist
Manoeuvring assistance
limited See Owner's Manual *T
heParking Assist manoeuvring assis tant is temp orarily una vailable or only partially available. #
Clean all sensors of the parking and camera sy stem (/ page 390). #
Ifth e display message still appears, consult a qualified specialist workshop.
Active Parking Assist and
PARKTRONIC inoperative
See Owner's Manual *
Ve hicles with Active Parking Assis t:Ac tive Parking Assist and Parking Assist PARKTRONIC are malfunctioning.
Ve hicles without Active Parking Assis t:Pa rking Assist PARKTRONIC is malfunctioning. #
Stop theve hicle in accordance with the tra ffic conditions and restart the engine. 486
Display messages and warning/indicator lamps

Display messages
Possible causes/consequences and M MSolutions
Active Brake Assist Func-
tions limited See Owner's
Manual *
Ve hicles with the Driving Assistance Package: Active Brake Assi stwith cross-traf fic function, Evasi veSteering
Assist or PRE‑SAFE ®
PLUS are temp orarily una vailable or only partially available.
Ve hicles without the Driving Assistance Package: Active Brake Assi stistemp orarily una vailable or only partially
av ailable. #
Consult a qualified specialist workshop.
Radar sensors dirty See
Owner's Manual *T
heradar sensor sy stem is malfunctioning. Possible causes:
R dirt on the sensors
R heavy rain or snow
R extended country driving wi thout other traf fic, e.g. in the desert
Driving sy stems and driving saf ety sy stems may be malfunctioning or temp orarily una vailable.
Once the cause of the problem is no longer present, the driving sy stems and driving saf ety sy stems will be available
again.
If th e display message does not disappear: #
Stop theve hicle in accordance with the tra ffic conditions. #
Clean all sensors (/ page 390). #
Restart the engine. Display messages and
warning/indicator lamps 491

Display messages
Possible causes/consequences and M MSolutions #
Tryto start the engine again. #
Ifth e engine does not start, consult a qualified specialist workshop.
Cannot start engine See
Owner's Manual *T
hecharge leve l of the 48 V battery is too lo w.You can no lon gerst art the engine. #
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 406).
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 the engine and drive theve hicle 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 495

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 burs t.
R The tyres can wearexc essively and/or une venly. 496
Display messages 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 damage causedbydriving 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. #
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.504
Display messages and warning/indicator lamps

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 508
Display messages and warning/indicator lamps

Ý
Please wait 48 V battery charg‐
ing ........................................................ .494
_ Rear left seat backrest not
loc ked (Example)................................... 465
h Rectify tyre pressure.................... 497
Ø Refill Ad Blue See Owne r’s
Manual.................................................. 499
! Release parking brake ..................474
¸ Replace air cleaner ...................... 468
Á Replace key.................................. 455
8 Reser vefuel le vel......................... 468
6 Restra int sys. malfunction Con‐
sult workshop........................................ 452
# See Owner's Manual....................4 93
Ù Steering malfunction Incre ased
ph ysical ef fort See Owner's Manual ...... 463
Ù Steering malfunction Stop
immediately See Owner's Manual ......... 464
# Stop vehicle Lea veengine run‐
ning ....................................................... 494 #
Stop vehicle See Owner's Man‐
ual......................................................... 493
É Stop vehicle Vehicle too low......... 485
ç suspended.................................... 478
: Switch off lights ........................... 458
: Switch on headlamps................... 458
Ø Top up AdBlue Emergency op.
in XXX miles See Owner's Manual......... 499
+ Top up coolant See Owner ’s
Manual.................................................. 466
¥ Top up washer fluid ...................... 466
! Turn on the ignition torelease
th e parking brake................................... 474
d Vehicle is operational Switch
off ignition before exiting..................... .462
É Vehicle rising Please wait............ .486
É Vehicle rising................................4 86
h Warning tyre defect..................... .497
h Wheel sensor(s) missing .............. 496Ø
XX,X l Top up AdBlue Switch on
ignition, wait 60 sec. or eng. start
not poss................................................ 500
Ac tive Blind Spot Assi stcur rently
una vailable See Owner's Manual ...........482
Ac tive Blind Spot Assi stinope rative ...... 482
Ac tive Blind Spot Assi stnot available
when towing a trailer See Owner's
Manual .................................................. 483
Ac tive bonnet malfunction See Own‐
er's Manual........................................... 464
Ac tive Brake Assi stFunctions cur‐
re ntly limited See Owner's Manual ........ 490
Ac tive Brake Assi stFunctions limited
See Owner's Manual.............................. 491
Ac tive Dis tance Assi stavailable again ...4 79
Ac tive Dis tance Assi stcur rently
una vailable See Owner's Manual ...........478
Ac tive Dis tance Assi stinope rative ......... 478 530
Index

Only select
Park (P) when vehicle is
st ationary.............................................. 468
Place theke y in the mar ked space
See Owner's Manual............................. 456
PRE-SAFE inoperative See Owner's
Manual..................................................4 54
Ra dar sensors dirty See Owner's
Manual..................................................4 91
Re duce speed ........................................ 498
Re versing not poss. Consult work‐
shop......................................................4 70
Risk of vehicle rolling Driver door
open and transmission not in P............. 469
Speed limit (winter tyres) XXX km/h .....479
St op vehicle Lea veengine running
Wa itTransmission cooling .....................470
To shift out of P or N,depress brake
and start engine.................................... 469 To
switch off the engine, press
St art/ Stop button for at least 3 sec‐
onds or 3 times. ................................... .466
Tr af fic Sign Assi stCamera view
re stricted See Owner's Manual............. 481
Tr af fic Sign Assi stcur rently una vaila‐
ble See Owner's Manual ........................ 480
Tr af fic Sign Assi stinope rative ............... 481
Tr ansmission Malfunction Stop.............. 470
Ty re press. monitor cur rently una vail‐
able ...................................................... .495
Ty re press. monitor inoperative.............4 95
Ty re press. monitor inoperative No
wheel sensors ...................................... .496
Ty re(s) ove rheated................................. 498
Wi thout changing gear, consult work‐
shop......................................................4 70
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................................ .76
Child saf ety lock (rear door).................... 70
Locking (emer gency key)......................... 79
Opening (from inside ).............................. 77
Un locking (emer gency key)..................... 79
Un locking (from inside).......................... .77
Door cont rol panel....................................... 16
Dr aw bar
see Tow- bar sy stem
Drive Away Assist ...................................... 24 2
Drive Away Assist
see Pr otection against collision
Drive position Enga ging................................................1 76
Drive prog ram display ............................... 173
Drive prog rams
see DYNA MIC SELECT
Driver's seat see Seat 532
Index

Driving abroad
Symmetrical low beam.......................... 12 8
Driving saf ety sy stem
ABS (Anti-lock Braking Sy stem).............1 94
Ac tive Brake Assi st................................ 213
Ad aptive brake lights............................. 19 8
BA S (Brake Assi stSystem).................... 194
Cameras............................................... .192
EBD (Electronic Brake forc e Distribu‐
tion).......................................................1 96
ESP ®
Crosswind Assis t.......................... 19 6
ESP ®
trailer stabilisation.......................1 96
Overview.............................................. .193
Ra dar and ultrasonic sensor s................ 19 2
Re sponsibility........................................1 92
ST EER CONTROL................................... 197
Driving sy stem
DY NA MIC BODY CONTROL.................... 225
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
see AIRMATIC
see ATTENTION ASSIST
see Blind Spot Assist
see Cruise control
see Driving saf ety sy stem
see HOLD function
see Limiter
see Parking Assist PARKTRONIC
see Reversing camera
see Traf fic Sign Assi st
Driving tips Driving abroad (symmetrical low
beam)....................................................1 28
Gene ral driving tips.............................. .166
optimised acceleratio n..........................16 5
Ru nning-in no tes.................................... 16 4
Dr ows iness de tection
see ATTENTION ASSIST
DY NA MIC BODY CONT ROL
Chassis................................................ .225
Dynamic handling control sy stem
see ESP ®
(Elect ronic Stability Prog ram) DY
NA MIC SELECT
Configuri ng drive program I................... 174
Displ aying engine data........................... 174
Displ aying vehicle dat a.......................... 174
Drive prog ram displa y............................ 173
Drive prog rams...................................... 172
Fu nction................................................ 172
Operating (DYNAMIC SELECT switch)....1 73
Selecting the drive prog ram................... 173
Showing ope ration feedback.................. 174 E
E10 ............................................................ .439
Easy entry feature
Fu nction/no tes..................................... 107
Setting................................................... 108
Easy exitfeature
Fu nction/no tes..................................... 107
Setting................................................... 108
EAS Y-PA CK load-securing kit
Ins talling/ removing thete lescopic rod.. 121
No tes..................................................... 121 Index
533