sensor MERCEDES-BENZ B-CLASS HATCHBACK 2021 Service Manual

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
ï
Tr ailer tow hitch warning
lamp *T
hered trailer hitch warning lamp is lit.
The trailer hitch is not operational. &
W
W ARNING
ARNING 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 tra1c conditions. Do not continue driving. #
Uncouple the trailer and secure it against rolling away. #
Initiate a new swivelling procedu reand do not re-couple the trailer until the display message disappears. #
Notethe messages on the instrument displa y.Engine
Engine
W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
ÿ
Coolant warning lamp (red) *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 484
484
Display message
s andwarning/indicator lamps

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions #
Make sure that the air supply tothera diator is not obstructed. #
Avoiding high loads on the engine, drive tothe nearest quali/ed specialist workshop. In doing so, ensu rethat the
coolant temp erature display remains below 120°C.
ÿ
Coolant warning lamp (yel-
low) *T
he yellow coolant warning lamp is lit while the engine is running.
Po ssible causes:
R The temp erature sensor is malfunctioning
R The charge air, transmission oil or battery cooling is faulty
R The radiator shutters are bloc ked or defective #
Avoiding high loads on the engine, drive tothe nearest quali/ed specialist workshop.
00B9 Engine diagnosis warning
lamp *T
he yellow engine diagnostics warning lamp is lit while the engine is running.
A malfunction has occur red in the engine, theex haust system or the fuel system.
The emissions limit value may ha vebeen exceeded and the engine may be running in eme rgency operation mode. #
Have theve hicle checked as soon as possible at a quali/ed specialist workshop.
V
V ehicles wit
ehicles wit h a diesel engine:
h a diesel engine: the fuel tank may ha vebeen run dr y. #
Start the engine thre eto four times aTer refuelling.
If th eye llow engine diagnosis warning lamp goes out, emer gency ope ration mode is cancelled. The vehicle need not
be checked. 486
486
Display messages and
warning/indicator lamps

Dr
Dr
iving syst
iving syst ems
ems W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
L
Wa rning lamp for distance
wa rning function *T
he red distance warning lamp lights up while theve hicle is in motion.
The dis tance totheve hicle in front is too small forth e speed selected.
If th ere is an additional warning tone, you are approaching an obstacle at too high a speed. #
Be prepared tobrake immediatel y. #
Increase the distance.
Fu nction of Active Brake Assist (/ page 244).
Ó Ac tive Brake Assist warning
lamp *T
heActive Brake Assist warning lamp is on.
Due todirty sensors or a malfunction, the system is not available or thera nge of functions is restric ted. #
Notethe messages on the instrument displa y.
ê
Ac tive Brake Assist warning
lamp *T
heActive Brake Assist warning lamp is on.
The system is switched o. or thera nge of functions has been automatically restric ted.
This may be the case if the driver is not wearing a seat belt or ano ther driving system has been activated. #
Obser vethe no tes on Active Brake Assist (/ page 244).490
490
Display messages and
warning/indicator lamps

EBD (Electronic Brake
forc e Distribu-
tion).......................................................2 27
HOLD function....................................... 228
Limited braking e.ect (salt-treated
ro ads)................................................... .173
Ne w/replaced brake linings/brake
discs...................................................... 172
Po st-collision brak e.................................. 60
Ru nning-in no tes.................................... 172
Br
Br ak ak es
es
see Recuperation
Br
Br aking assist
aking assist ance
ance
see BAS (Brake Assist System)
Br
Br eakdo
eakdo wn
wn
Assistance overview. ................................ 20
To w- starting........................................... 370
To wing away.......................................... 367
Tr anspo rting theve hicle........................ .368
Wheel chang e........................................ 383
Br
Br ea kdo
eakdo wn
wn
see Flat tyre
Butt
Butt ons
ons
St eering wheel....................................... 282 C
C
Calls
Calls Mercedes me......................................... 314
Camera
Camera
Information............................................ 223
Camera Camera see 360° Camera
see Dashcam
see Reversing camera
Car key
Car key
see Key
Car w Car w ash
ash
see Care
Car w
Car w ash (car
ash (car e)
e)............................................ 343
Car
Car -t
-to-X
o-X -Communication
-Communication
Displaying hazard warnings.................... 308
Care
Care 360° camera......................................... 348
Air-water duct........................................ 343
Automatic car wash.............................. .343
Carpet................................................... 349
Decorative foil........................................ 347
Display................................................... 349 Exterior lighting...................................... 348
Head-up display..................................... 349
High-pressure cleaner............................3
45
Pa int...................................................... 346
Plastic trim............................................3 49
Re alwo od/trim elements..................... .349
Re versing camera..................................3 48
Ro of lining............................................. 349
Seat belt................................................ 349
Seat co ver............................................. 349
Sensors.................................................3 48
St eering wheel....................................... 349
Ta ilpipes................................................ 348
Tr ailer hitc h............................................ 348
Ve hicle soc ketfo rth e high-voltage
battery................................................... 348
Wa shing byhand.................................... 346
Wheels/rims.......................................... 348
Wi ndo ws................................................ 348
Wi per blades.......................................... 348
Car
Car pe pet (Car
t (Car e)
e)............................................... 349
Changing bulbs Changing bulbs Dipped beam......................................... 149
Fitting/removing co ver (front wheel
ar ch )...................................................... 148 Index
499 499

:
Intelligent Light System inopera-
tive........................................................ 421
Á Key being initialised Please wait.... 418
Á Key not de tected (red display
message).............................................. .418
Á Key not de tected (white display
message).............................................. .418
: LeT dipped beam (e xample).......... 419
0075 LeT windowbag malfunction
Consult workshop (e xample).................. 415
: Malfunction See Owner's Man-
ual.........................................................4 20
00D7 Malfunction Visit workshop ........... 429
0080 Malfunction.................................. 430
00D7 Malfunction.................................. 429
ð Maximum speed exceeded ............ 455
ç O................................................. 453
00D9 O................................................. 451
0024 Parking brake See Owner's
Manual..................................................4 460080
Performance se verely limited........ 430
00B4 Please wait Depressurising tank .... 431
003B Pre-entry clima tecont rol (via
ke y) available again aTer engine start..... 425
003B Pre-ent ryclimate cont rol (via
ke y) inoperati veHV-battery low .............. 425
0077 Rectify tyre pressure ..................... 471
Ú Re/ll AdBlue See Owner ’sMan-
ual ......................................................... 474
0024 Release parking brake ...................449
009E Replace air cleaner ....................... 440
Á Replace key.................................. 417
00D4 Reser vefuel le vel.......................... 440
0075 Restraint sys. malfunction Con-
sult workshop ....................................... .413
003D See Owner's Manual..................... 467
Ù Steering malfunction Increased
ph ysical e.ort See Owner's Manual....... 434
Ù Steering malfunction See Own-
er's Manual ............................................ 435 Ù
Steering malfunction Stop
immediately See Owner's Manual ........... 434
0080 Stop Switch engine o.................. .430
003D Stop vehicle Lea veengine run-
ning ....................................................... 469
003D Stop vehicle See Owner's Man-
ual......................................................... 468
ç suspended .................................... 453
: Switch o. lights............................ 421
: Switch on headlamps .................... 421
00B4 Tank is dep ressurised Ready for
re fuelling ............................................... 431
00B4 Tank ventilation Malfunction
Consult workshop ................................. .431
á temp orarily una vailable Camera
view restric ted....................................... 460
¸ temp orarily una vailable Sensors
dirty....................................................... 459
Ú Top up AdBlue Emer gency op. in
XXX miles See Owner's Manual.............. 474 504 504
Ind
ex

00BD
Top up coolant See Owner ’s
Manual.................................................. 439
00B2 Top up washer 0uid...................... .437
u Towing not permitted See Own-
er's Manual ............................................ 426
0080 Trans. oil overheated Drive on
with care................................................ 444
0024 Turn on the ignition torelease
th e parking brake ................................... 449
Ú .................................................... 474
0072 Vehicle is operational Switch o.
ignition before exiting............................. 432
0077 Warning tyre defect....................... 471
0077 Wheel sensor(s) missing ................ 470
Ú XX,X l Top up AdBlue Swit chon
ignition, wait 60 sec. or eng. start not
poss...................................................... 475
"Electric" drive prog ram cur rently
una vailable............................................. 428 Ac
tive Blind Spot Assist cur rently
una vailable See Owner's Manual ............ 458
Ac tive Blind Spot Assist inoperative........ 458
Ac tive Blind Spot Assist not available
when towing a trailer See Owner's
Manual.................................................. 458
Ac tive bonnet malfunction See Own-
er's Manual............................................ 435
Ac tive Brake Assist Functions cur-
re ntly limi ted See Owner's Manual .........465
Ac tive Brake Assist Functions limi ted
See Owner's Manual.............................. 466
Ac tive Distance Assist available again ..... 454
Ac tive Distance Assist cur rently
una vailable See Owner's Manual ............ 453
Ac tive Distance Assist inoperative.......... 454
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual ............ 458
Ac tive Lane Keeping Assist inoperative... 459 Ac
tive Steering Assist cur rently
una vailable due tomultiple emer-
ge ncy stops........................................... 456
Ac tive Steering Assist cur rently
una vailable See Owner's Manual ............ 455
Ac tive Steering Assist inoperative...........4 55
Ad aptive Highbeam Assist cur rently
una vailable See Owner's Manual ............ 421
Ad aptive Highbeam Assist inoperative ....4 22
Ad aptive Highbeam Assist Plus cur-
re ntly una vailable See Owner's Manual ... 422
Ad aptive Highbeam Assist Plus inop-
erative.................................................. .422
Anti-theT alarm system Malfunction ....... 437
Apply brake todeselect Park (P) posi-
tion....................................................... .441
Apply brake toselect D or R ...................442
Apply brake toselect R .......................... 442
Au xiliary battery malfunction (red dis-
play message) ....................................... .446 Index
505 505

Re
duced drive system per form ance
See Owner's Manual.............................. 428
Re versing not poss. Consult workshop ... 443
Risk of vehicle rolling away App ly
parking brake See Owner's Manual ........ 444
Risk of vehicle rolling awayPa rking
brake not applied See Owner's Manual ... 450
Risk of vehicle rolling Driver door
open and transmission not in P .............. 442
Ru n Flat Indica tor inoperative................. 473
Speed limit (winter tyres) XXX km/h .......455
Speed Limit Assist cur rently una vaila-
ble See Owner's Manual........................ 454
Speed Limit Assist inoperative................ 454
Te aching in transmission comple te......... 444
Te aching in transmission Operate
selector le ver Brake for XX seconds
Risk of vehicle rolling ............................. 444
To shiT out of P or N,depress brake
and start engine.................................... .441 To
switch o. the engine, press the
St art/ Stop button for at least 3 sec-
onds or 3 times...................................... 438
Tr a1c Sign Assist cur rently una vaila-
ble See Owner's Manual........................ 456
Tr a1c Sign Assist inoperative................. 456
Tr ansmission Malfunction ....................... 443
Tr ansmission Malfunction Stop............... 443
Tr ansmission Malfunction Visit work-
shop ...................................................... 445
Ty re press. monitor cur rently una vaila-
ble......................................................... 469
Ty re press. monitor inoperative .............. 469
Ty re press. monitor inoperative No
wheel sensors ........................................ 470
Ty re pressure Check tyres ...................... 472
Ty re(s) ove rheated .................................. 472
Ve hicle not cur rently being charged
Charging station fault............................. 427
Wi per malfunctioning .............................437 Wi
thout changing gear, consult work-
shop ............................................. .429, 442
Wi thout starting engine again, consult
wo rkshop ............................................... 429
Dist
Dist ance contr ance contr ol
ol
see Active Distance Assist DISTRONIC
DIS DIS TR
TR ONIC ONIC
see Active Distance Assist DISTRONIC
Door
Door Additional door loc k................................. 84
Child saf ety lock (rear door )..................... 78
Locking/unlocking (emer gency key)........ .88
Opening (from inside).............................. .85
Unlo cking (from inside)............................ 85
Door contr
Door contr ol panel
ol panel......................................... 18
Dra
Dra wbar
wbar
see Tow- bar system
Dr
Dr iv
ive Awa
e Away Assi st
y Assi st........................................ .272
Dr
Dr iv
ive position
e position
Engaging................................................ 189
Dr
Dr iv
ive pr
e pr ogr
ogram display
am display .................................. 183 Index
507
507

Dr
Dr
iv
ive pr
e pr ogr
ograms
ams
see DYNAMIC SELECT
Dr
Dr iv
iver's seat
er's seat
see Seat
Dr
Dr iving abr
iving abr oad
oad
Light adjustment (l owbeam).................. 138
Dr
Dr iving safe
iving safe ty syst
ty system
em
ABS (Anti-lock Braking System)............. .225
Ac tive Brake Assist................................. 244
Ad aptive brake lights.............................. 229
BAS (Brake Assist System).................... .225
Cameras................................................2 23
EBD (Electronic Brake forc e Distribu-
tion).......................................................2 27
ESP ®
Crosswind Assist.......................... 226
ESP ®
trailer stabilisation........................ 227
Overview................................................ 224
Ra dar and ultrasonic sensor s................. 223
Re sponsibility......................................... 223
ST EER CONTROL................................... 227
Dr
Dr iving syst iving syst em
em
Suspension with adaptive damping
adjustment............................................ 257 Dr
Dr iving syst
iving syst em
em
see 360° Camera
see Active Blind Spot Assist
see Active Distance Assist DISTRONIC
see Active Emer gency Stop Assist
see Active Lane Keeping Assist
see Active Parking Assist
see Active Speed Limit Assist
see Active Steering Assist
see ATTENTION ASSIST
see Blind Spot Assist
see Cruise cont rol
see Driving saf ety sy stem
see HOLD function
see Limi ter
see Parking Assist PARKTRONIC
see Reversing camera
see Speed Limit Assist
see Start-o. assist
see Tra1c Sign Assist
Dr
Dr iving tips iving tips
Driving abroad (low beam light adjust-
ment)..................................................... 138
Gene ral driving tips................................1 73
Ru nning-in no tes.................................... 172 Dr Dr
iving tips
iving tips
see Recuperation
Dr ow
Dr ow siness det
siness det ection
ection
see ATTENTION ASSIST
Dynamic handling contr
Dynamic handling contr ol syst
ol syst em
em
see ESP ®
(Electronic Stability Prog ram)
D
D YN
YNAMIC SELECT AMIC SELECT
Ad aptive damping adjustmen t................257
Calling up the fuel consum ption indi-
cator...................................................... 185
Con/guring drive prog ram I................... .184
Displaying engine data........................... 185
Displaying vehicle dat a........................... 185
Drive prog ram displa y............................ 183
Drive prog rams..................................... .182
Fu nction................................................ 182
Ope rating.............................................. 183
Selects the drive prog ram...................... 183 E E
E10
E10............................................................. .397
Easy entr
Easy entr y f
y feature
eature
Fu nction/no tes...................................... 116
Setting.................................................. .117 508
508
Index

ESC (Electr
ESC (Electr
onicSt
onic Stability Contr
ability Contr ol)
ol)
see ESP ®
(Elect ronic Stability Prog ram)
ESP
ESP ®
®
Crosswind Assis t.................................... 226
Tr ailer stabilisatio n................................. 227
ESP
ESP ®
®
(Electr
(Electronic St
onic Stability Pr
ability Pr ogr
ogram)
am)
Ac tivating/deactivating.......................... 227
Fu nction/no tes...................................... 225
EU type appr ov
EU type appr oval number
al number ............................. 394
Ext
Ext er
erior lighting
ior lighting
Care..................................................... .348
Ext
Ext er
erior lighting
ior lighting
see Lights F F
F F atigue det
atigue det ection
ection
see ATTENTION ASSIST
F
F ir
ir e e
e e xtinguisher
xtinguisher.......................................... 353
F
F irs
irst-aid kit t-aid kit (soT
(soTsided)
sided)................................. 353
Flat to
Flat towing
wing
see Tow- bar system Flat tyre
Flat tyre
MOExtended tyres................................. 354
No tes..................................................... 354
TIREFIT kit.............................................. 356
Wheel chang e........................................ 383
Floor mats
Floor mats................................................... 136
F
F oil cov
oil cov er
er ing
ing
Ra dar and ultrasonic sensor s................. 223
Fr
Fr ee
ee soTw
soTw are
are................................................. 45
Fr
Fr eq
eq uencies
uencies
Mobile phone......................................... 393
Tw o-w ayradio........................................ 393
Fr Fr ont airbag (dr
ont airbag (dr iv
iver
er , fr
, fr ont passeng
ont passeng er)
er).............. 52
Fr
Fr ont passeng
ont passeng er seat
er seat
see Load compartment
see Seat
Fr
Fr ont wheel ar ch
ont wheel ar ch
Fi tting/removing the co ver..................... 148
Fr
Fr ont wheel arc
ont wheel arc h cov
h cover
er
Fi tting/removing.................................... 148
F
F uel
uel
Additives................................................ 398
Diesel.................................................... 399 E10........................................................ 397
Fu
elreser ve........................................... 400
Low outside temp eratures...................... 399
Pe trol..................................................... 397
Quality (diesel )....................................... 399
Quality (petrol)....................................... 397
Re fuellin g.............................................. .191
Sulphur content..................................... 397
Ta nk content.......................................... 400
F F uel consump
uel consump tion indicat
tion indicator
or
Calling up.............................................. 185
F
F unction seat
unction seat
see Door cont rol panel
F
F uses
uses
Before replacing a fuse.......................... 371
Fu se assignment diag ram...................... .371
Fu se box in the engine compartment......3 72
Fu se box in the front passenger foot-
we ll........................................................3 72
Fu se box in the load compartment......... 373
No tes..................................................... 371 510
510
Index

Fo
lding the backrest forw ards (rear)...... .122
Locking the backrest (rear).................... 124
Operating the memory function.............. 118
Re setting the settings............................ 113
Setting options......................................... 18
Seat belt
Seat belt Activating/deactivating seat belt
adjustment.............................................. 51
Care...................................................... 349
Fa stening................................................. 50
Pro tection................................................ 48
Re ar seat belt status displ ay..................... 52
Re duced pr otection.................................. 49
Re leasing................................................. 51
Seat belt adjustment (function)................ 51
Wa rning lamp........................................... 51
Seat belt adjus Seat belt adjustment tment
Ac tivating/deactivating............................ 51
Fu nction.................................................. 51
Seat belt t Seat belt t ensioners
ensioners
Ac tivation................................................ 47
Seat belt w
Seat belt w ar
arning
ning
see Seat belt
Seat cov
Seat cov er (Car
er (Care)
e)......................................... 349 Seat heating
Seat heating
Activating/deactivating.......................... 113
Seat v
Seat v entilation
entilation
Switching on/o..................................... 114
Selecting a g
Selecting a g ear
ear
see Changing gears
Select
Select or lev
or lever
er
see DIRECT SELECT le ver
Self-t
Self-t est
est
Au tomatic front passenger airbag shut
o............................................................. 57
Sensor
Sensor s (car
s (care)
e)............................................. 348
Ser
Ser vice
vice
see ASSY STPLUS
Ser
Ser vice cent re
vice centre
see Quali/ed specialist workshop
Ser
Ser vice int
vice int erv
erval display
al display
see AS SYST PLUS
Se
Se tting a speed
tting a speed ............................................ 182
Se
Se tting a speed
tting a speed
see Cruise cont rol Se
Se
tting t
tting t he map scale
he map scale
see Map
ShiT
ShiT paddles
paddles
see Steering wheel gearshiT paddles
ShiTing
ShiTing g
gears
ears
GearshiT recommendation............ .187, 190
Side airbag
Side airbag..................................................... 52
Side im Side im pact prot
pact pr otection
ection ................................. 265
Side windo ws
Side windo ws
Au tomatic function.................................. .96
Child saf ety lock in there ar..................... .80
Closing using theke y............................... 97
Co nve nience closing............................... .97
Con venience opening.............................. .96
Opening with theke y................................ 96
Opening/closing...................................... 95
Problem................................................... 97
Ra in closing function................................96
Sliding sunr
Sliding sunr oof oof
Au tomatic functions............................... 101
Closing................................................... .98
Closing using theke y............................... 97
Opening................................................... 98
Opening wi th theke y................................ 96 522 522
Index