sensor MERCEDES-BENZ A-CLASS SALOON 2021 Service Manual

W
W
ar
ar ning/indicat
ning/indicat or lampP
or lam pP ossible causes/conseq
ossible causes/consequences and uences andM
MSolutions
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.
; 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. Display messages and
warning/indicator lamps
475
475

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 andM
MSolutions
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 235).
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 235). Display messages and
warning/indicator lamps
479
479

Br
Br
ak
ak es
es
ABS (Anti-lo ckBraking System).............. 215
Ac tive Brake Assist................................. 235
Ad aptive brake lights.............................. 220
BAS (Brake Assist System).................... .216
Driving tips............................................ 163
EBD (Electronic Brake forc e Distribu-
tion).......................................................2 18
HOLD function....................................... 219
Limited braking e.ect (salt-treated
ro ads)................................................... .163
Ne w/replaced brake linings/brake
discs...................................................... 162
Po st-collision brak e.................................. 60
Ru nning-in no tes.................................... 162
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........................................... 359
To wing away.......................................... 356
Tr anspo rting theve hicle........................ .357
Wheel chang e........................................ 373 Br
Br ea kdo
eakdo wn
wn
see Flat tyre
Butt
Butt ons
ons
St eering wheel....................................... 273 C
C
Calls
Calls Mercedes me......................................... 305
Camera
Camera
Information............................................ 214
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)............................................ 331
Car
Car -t
-to-X
o-X -Communication
-Communication
Displaying hazard warnings.................... 299
Care
Care 360° camera......................................... 336 Air-water duct........................................ 331
Au
tomatic car wash.............................. .331
Carpet................................................... 337
Decorative foil........................................ 335
Display................................................... 337
Exterior lighting...................................... 336
Head-up display..................................... 337
High-pressure cleaner............................3 33
Pa int...................................................... 334
Plastic trim............................................3 37
Re alwo od/trim elements..................... .337
Re versing camera..................................3 36
Ro of lining............................................. 337
Seat belt................................................ 337
Seat co ver............................................. 337
Sensors................................................. 336
St eering wheel....................................... 337
Ta ilpipes................................................ 336
Tr ailer hitc h............................................ 336
Ve hicle soc ketfo rth e high-voltage
battery................................................... 336
Wa shing byhand.................................... 334
Wheels/rims.......................................... 336
Wi ndo ws................................................ 336
Wi per blades.......................................... 336 488 488
Index

¸
temp orarily una vailable Sensors
dirty....................................................... 448
Ú Top up AdBlue Emer gency op. in
XXX miles See Owner's Manual.............. 463
+ Top up coolant See Owner ’s
Manual.................................................. 427
¥ Top up washer 0uid...................... .426
u Towing not permitted See Own-
er's Manual ............................................ 415
d Trans. oil overheated Drive on
with care................................................ 432
! Turn on the ignition torelease
th e parking brake ................................... 438
Ú .................................................... 463
d Vehicle is operational Switch o.
ignition before exiting............................. 421
h Warning tyre defect....................... 460
h Wheel sensor(s) missing ................ 459Ú
XX,X l Top up AdBlue Swit chon
ignition, wait 60 sec. or eng. start not
poss...................................................... 464
"Electric" drive prog ram cur rently
una vailable............................................. 417
Ac tive Blind Spot Assist cur rently
una vailable See Owner's Manual ............ 446
Ac tive Blind Spot Assist inoperative........ 446
Ac tive Blind Spot Assist not available
when towing a trailer See Owner's
Manual.................................................. 447
Ac tive bonnet malfunction See Own-
er's Manual............................................ 424
Ac tive Brake Assist Functions cur-
re ntly limi ted See Owner's Manual .........454
Ac tive Brake Assist Functions limi ted
See Owner's Manual.............................. 455
Ac tive Distance Assist available again ..... 443
Ac tive Distance Assist cur rently
una vailable See Owner's Manual ............ 442Ac
tive Distance Assist inoperative.......... 442
Ac tive Lane Keeping Assist cur rently
una vailable See Owner's Manual ............ 447
Ac tive Lane Keeping Assist inoperative... 447
Ac tive Steering Assist cur rently
una vailable due tomultiple emer-
ge ncy stops........................................... 444
Ac tive Steering Assist cur rently
una vailable See Owner's Manual ............ 444
Ac tive Steering Assist inoperative...........4 44
Ad aptive Highbeam Assist cur rently
una vailable See Owner's Manual ............ 410
Ad aptive Highbeam Assist inoperative ....4 11
Ad aptive Highbeam Assist Plus cur-
re ntly una vailable See Owner's Manual ... 411
Ad aptive Highbeam Assist Plus inop-
erative.................................................. .411
Anti-theT alarm system Malfunction ....... 426
Apply brake todeselect Park (P) posi-
tion....................................................... .430 494 494
Index

PRE-SAFE inoperati
veSee Owner's
Manual.................................................. 406
Re duce speed........................................ 461
Re duced drive system per form ance
See Owner's Manual.............................. 417
Re versing not poss. Consult workshop ... 431
Risk of vehicle rolling away App ly
parking brake See Owner's Manual ........ 433
Risk of vehicle rolling awayPa rking
brake not applied See Owner's Manual ... 438
Risk of vehicle rolling Driver door
open and transmission not in P .............. 431
Ru n Flat Indica tor inoperative................. 462
Speed limit (winter tyres) XXX km/h .......443
Speed Limit Assist cur rently una vaila-
ble See Owner's Manual........................ 443
Speed Limit Assist inoperative................ 443
Te aching in transmission comple te......... 433 Te
aching in transmission Operate
selector le ver Brake for XX seconds
Risk of vehicle rolling ............................. 432
To shiT out of P or N,depress brake
and start engine.................................... .430
To switch o. the engine, press the
St art/ Stop button for at least 3 sec-
onds or 3 times...................................... 427
Tr a1c Sign Assist cur rently una vaila-
ble See Owner's Manual........................ 445
Tr a1c Sign Assist inoperative................. 445
Tr ansmission Malfunction ....................... 432
Tr ansmission Malfunction Stop............... 431
Tr ansmission Malfunction Visit work-
shop ...................................................... 433
Ty re press. monitor cur rently una vaila-
ble......................................................... 458
Ty re press. monitor inoperative .............. 458
Ty re press. monitor inoperative No
wheel sensors ........................................ 459 Ty
re pressure Check tyres ...................... 461
Ty re(s) ove rheated .................................. 461
Ve hicle not cur rently being charged
Charging station fault............................. 416
Wi per malfunctioning .............................426
Wi thout changing gear, consult work-
shop ............................................. .418, 431
Wi thout starting engine again, consult
wo rkshop ............................................... 418
Dist
Dist ance contr
ance contr ol ol
see Active Distance Assist DISTRONIC
DIS
DIS TR
TRONIC
ONIC
see Active Distance Assist DISTRONIC
Door
Door Additional door loc k................................. 86
Child saf ety lock (rear door )..................... 79
Locking/unlocking (emer gency key)........ .89
Opening (from inside).............................. .86
Unlo cking (from inside)............................ 86
Door contr
Door contr ol panel
ol panel......................................... 18
Dra
Dra wbar
wbar
see Tow- bar system 496
496
Index

Dr
Dr
iv
ive Awa
e Away Assi st
y Assi st........................................ .263
Dr
Dr iv
ive position
e position
Engaging................................................ 179
Dr
Dr iv
ive pr
e pr ogr
ogram display
am display .................................. 173
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).................. 130
Dr
Dr iving safe
iving safe ty syst
ty system
em
ABS (Anti-lock Braking System)............. .215
Ac tive Brake Assist................................. 235
Ad aptive brake lights.............................. 220
BAS (Brake Assist System).................... .216
Cameras................................................2 14
EBD (Electronic Brake forc e Distribu-
tion).......................................................2 18
ESP ®
Crosswind Assist.......................... 217
ESP ®
trailer stabilisation........................ 217
Overview................................................ 214
Ra dar and ultrasonic sensor s................. 214
Re sponsibility......................................... 213
ST EER CONTROL................................... 218 Dr
Dr iving syst
iving syst em
em
Suspension with adaptive damping
adjustment............................................ 248
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)..................................................... 130
Gene ral driving tips................................1 63
Ru nning-in no tes.................................... 162
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 system
em
see ESP ®
(Electronic Stability Prog ram)
D
D YN
YNAMIC SELECT AMIC SELECT
Ad aptive damping adjustmen t................248
Calling up the fuel consum ption indi-
cator...................................................... 175
Con/guring drive prog ram I................... .174
Displaying engine data........................... 175
Displaying vehicle dat a........................... 175
Drive prog ram displa y............................ 173
Drive prog rams..................................... .172
Fu nction................................................ 172
Ope rating.............................................. 173
Selects the drive prog ram...................... 173 Index
497 497

To
pping up............................................ .328
ERA
ERA -GL
-GLON
ONASS tASS t es
est modet mode
St arting/ending.................................... .317
Err
Err or message
or message
see Display message
ESC (Electr
ESC (Electr onicSt
onic Stability Contr
ability Contr ol)
ol)
see ESP ®
(Elect ronic Stability Prog ram)
ESP
ESP ®
®
Crosswind Assis t.................................... 217
Tr ailer stabilisatio n................................. 217
ESP
ESP ®
®
(Electr
(Electronic St
onic Stability Pr
ability Pr ogr
ogram)
am)
Ac tivating/deactivating.......................... 218
Fu nction/no tes...................................... 216
EU type appr ov
EU type appr oval number
al number ............................. 384
Ext
Ext er
erior lighting
ior lighting
Care..................................................... .336
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.......................................... 341
F
F irs
irst-aid kit t-aid kit (soT
(soTsided)
sided)................................. 341
Flat to
Flat towing
wing
see Tow- bar system
Flat tyre
Flat tyre MOExtended tyres................................. 342
No tes..................................................... 342
TIREFIT kit.............................................. 344
Wheel chang e........................................ 373
Floor mats
Floor mats................................................... 129
F F oil cov
oil cov er
ering
ing
Ra dar and ultrasonic sensor s................. 214
Fr
Fr ee
ee soTw
soTw are
are................................................. 45
Fr
Fr eq
eq uencies
uencies
Mobile phone......................................... 382
Tw o-w ayradio........................................ 382
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 Seat
Fr
Fr ont wheel ar ch
ont wheel ar ch
Fi tting/removing the co ver..................... 140 F
F
r
ront wheel arc
ont wheel arc h cov
h cover
er
Fi tting/removing.................................... 140
F
F uel
uel
Additives................................................ 388
Diesel.................................................... 388
E10........................................................ 387
Fu elreser ve........................................... 389
Low outside temp eratures...................... 388
Pe trol..................................................... 387
Quality (diesel )....................................... 388
Quality (petrol)....................................... 387
Re fuellin g.............................................. .182
Sulphur content..................................... 387
Ta nk content.......................................... 389
F F uel consump
uel consump tion indicat
tion indicator
or
Calling up.............................................. 175
F
F unction seat
unction seat
see Door cont rol panel
F
F uses
uses
Before replacing a fuse.......................... 360
Fu se assignment diag ram...................... .360
Fu se box in the boo t.............................. .362
Fu se box in the engine compartment......3 61 Index
499
499

Seat cov
Seat cov
er (Car
er (Care)
e)......................................... 337
Seat heating
Seat heating Activating/deactivating.......................... 113
Seat v
Seat v entilation
entilation
Switching on/o..................................... 113
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)............................................. 336
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 ............................................ 172
Se
Se tting a speed
tting a speed
see Cruise control 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............ .177, 180
Side airbag
Side airbag..................................................... 52
Side im Side im pact prot
pact pr otection
ection ................................. 256
Side windo ws
Side windo ws
Au tomatic function.................................. .95
Child saf ety lock in there ar..................... .80
Closing using theke y............................... 96
Co nve nience closing............................... .96
Con venience opening.............................. .95
Opening with theke y................................ 95
Opening/closing...................................... 94
Problem................................................... 96
Ra in closing function................................ 95
Sliding sunr
Sliding sunr oof oof
Au tomatic functions................................. 99
Closing................................................... .97
Closing using theke y............................... 96
Opening................................................... 97
Opening wi th theke y................................ 95 Problem................................................. 100
Ra in-closing feature................................ .99
Smar
Smar tphone tphone
see Sma rtphone integ ration
see Telephone
Smar
Smar tphone int
tphone int egr
egration
ation
Overview................................................ 313
Sno
Sno w c
w chains
hains................................................3 63
Soc ke
Soc ket (12 V)
t (12 V)
Boot/luggage compartment................... 125
Fr ont centre console.............................. 125
Soc ke
Soc ket (115 V)
t (115 V)
Re ar....................................................... 125
SoTw
SoTw are
areupdate
update
System updates.................................... .288
Sound
Sound PRE-SAFE ®
Sound................................... 59
Sound menu
Sound menu Functions overview................................ 323
Spar Spar e wheel e wheel
see Emer gency spa rewheel
Specialis
Specialis t w
t w ork
ork shop
shop
see Quali/ed specialist workshop Index
511
511

Equipment............................................... 26
Implied warrant y...................................... 41
Locking (automatically)............................ 88
Locking/unlocking (emer gency key)........ .89
Locking/unlocking (from inside)............... 87
Locking/unlocking (KEYLESS-GO)............ 87
Lo we ring................................................ 377
Medical aids............................................ 40
Pa rking up............................................. 212
QR code rescue car d............................... 41
Quali/ed specialist workshop.................. .39
Ra ising................................................... 374
REACH regulation.................................... 40
Re gistration............................................. 40
Setting collision de tection (par ked
ve hicle).................................................. 212
St andby mode function.......................... 212
St arting (emer gency ope ration mode ).... 160
St arting (Remo teOnline)........................ 162
St arting (start/stop but ton)................... 160
SV HC (substances of very high conce rn)..40
Switching o. (start/stop button)............ 205
Switching on (start/stop button)............ 159
To wing................................................... 270
Ve ntilating (con venience opening)........... .95V V
ehicle batt
ehicle batt ery
ery
see On-board electrical system battery (12 V)
V
V ehicle camera
ehicle camera
Information............................................ 214
V
V ehicle data
ehicle data
Displaying (DYNAMIC SELECT)............... 175
Ro of load............................................... 395
Ve hicle height....................................... .395
Ve hicle length........................................ 395
Ve hicle widt h......................................... 395
Wheelbase............................................. 395
V
V ehicle dimensions
ehicle dimensions...................................... 395
V
V ehicle emerg
ehicle emerg ency st
ency start
art............................... 359
V
V ehicle
ehicle identi/cation
identi/cation number
number
see VIN
V
V ehicle
ehicle identi/cation
identi/cation plate
plate
EU type appro val number....................... 384
Maximum gross vehicle weight............... 384
Pa int code............................................. 384
Pe rm issible axle load.............................. 384
VIN........................................................3 84
V
V ehicle int
ehicle int er
erior
ior
Cooling or heating (Remo teOnline)........ 161 V
V
ehicle key
ehicle key
see Key
V
V ehicle maint
ehicle maint enance
enance
see ASS YST PLUS
V
V ehicle sensors
ehicle sensors
Information............................................ 214
V
V ehicle soc ket
ehicle soc ket
Care...................................................... 336
Indicator lamps...................................... 195
V V ehicle t
ehicle t ool kit
ool kit
TIREFIT kit...................................... 343, 344
To wing eye............................................. 359
V
V entilating
entilating
Con venience opening.............................. .95
V
V entilation
entilation
see Climate control
V
V ents
ents
see Air vents
VIN
VIN Engine compartment.............................. 384
Identi/cation pla te................................. 384
Wi ndsc reen............................................ 384 516 516
Index