battery MERCEDES-BENZ A-CLASS HATCHBACK 2021 Repair 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
483
483

Overview.................................................
.53
PA SSENGER AIR BAG indicator la mps...... 57
Pr otection................................................ 54
Re duced pr otection.................................. 55
Side airbag.............................................. 53
Wi ndow airbag......................................... 53
Air0 ow
Air0ow
Setting................................................... 153
Alar Alar m syst m syst em
em
see ATA (anti-theT alarm system)
All-wheel dr
All-wheel dr ive
ive
see 4M ATIC
Ambient lighting
Ambient lighting Setting (MBUX multimedia system)........ .142
Andr
Andr oid A
oid A uto
uto
see Smartphone integ ration
Animals
Animals Pets in theve hicle.................................... 80
Anti-loc
Anti-loc k br
k braking syst
aking syst em
em
see ABS (Anti-lock Braking System)
Anti-skid c
Anti-skid c hains
hains
see Sn owchains Anti-t
Anti-theT
heTprot
pr otection
ection
Ad ditional door loc k................................. 86
Immobiliser.............................................. 99
Anti-t
Anti-theT heTprot
pr otection
ection
see ATA (anti-theT alarm system)
Anticipat
Anticipat or
ory occupant pr ot
y occupant pr otection
ection
see PRE-SAFE ®
(anticipatory occu-
pant pr otection)
see PRE-SAFE ®
PLUS (anticipatory
occupant pr otection plus)
Apple CarPlay
Apple CarPlay ®
®
see Smartphone integ ration
Assist Assist ance syst ance syst ems
ems
see Driving saf ety sy stem
ASS YS
ASS YST PL
T PL US
US
Battery disconnection period s................ 331
Displaying the service due dat e.............. 330
Fu nction/no tes...................................... 330
Re gular maintenance work..................... 330
Special service requ irements................. 330
AT
ATA A(anti-t
(anti-theT heTalar
alarm syst
m syst em)
em)
Deactivating the alarm........................... 100
Fu nction.................................................. 99
Interior pr otection function.....................1 01Priming/deactivating interior pr
otec-
tion........................................................ 101
Priming/deactivating tow- awa y pro-
te ction................................................... 101
To w- awa y protection function................. 100
A
A TTENTION ASSIST TTENTION ASSIST
Function................................................ 227
Setting.................................................. .229
System limitations.................................. 227
A A tt tt ention assist
ention assist ant
ant
see ATTENTION ASSIST
A
A ut
ut hor
hor ised w
ised w ork
orkshop
shop
see Quali/ed specialist workshop
A
A ut
ut omatic car w
omatic car w ash mode
ash mode
Ac tivating............................................... 339
A
A ut
ut omatic co-dr
omatic co-dr iv
iver airbag
er airbag shut
shuto.
o.
Fu nction of co-driver airbag shuto........... 56
A
A ut
ut omatic dist
omatic dist ance contr
ance control
ol
see Active Distance Assist DISTRONIC
A
A ut
ut omatic dr
omatic dr iving lights
iving lights ................................ 135
A
A ut
ut omatic engine st
omatic engine st art
art
see ECO start/stop function 494
494
Index

A
A
ut
ut omatic engine st
omatic engine st op
op
see ECO start/s top function
A
A ut
ut omatic fr
omatic fr ont passeng
ont passeng er airbag
er airbagshut
shuto.
o.
PA SSENGER AIR BAG indicator la mps...... 57
A
A ut
ut omatic measur
omatic measur es
esaTer
aTer an accident
an accident ............ 61
A
A ut
ut omatic mirr
omatic mirr or f
or folding function
olding function
Ac tivating/deactivating.......................... 152
A
A ut
ut omatic tr
omatic tr ansmission
ansmission
DIRECT SELECT le ver............................. 183
Drive prog rams...................................... 178
DY NAMIC SELECT switch....................... 178
Engaging drive position.......................... 185
Engaging reve rsege ar............................ 184
Kickdown............................................... 186
Manual gear changing........................... .185
Selecting park position........................... 184
St eering wheel gearshiT paddles............ 185
Tr ansmission position displ ay................. 183
Tr ansmission position s........................... 183
A
A ut ut omatic tr
omatic tr ansmission (pr
ansmission (problem) oblem)
see Transmission (problem)
Axle load
Axle load Perm issible............................................ 392
Tr ailer operatio n..................................... 408 B
B
Bag hook
Bag hook..................................................... 126
Ball neck
Ball neck Folding out/in........................................ 271
B B AS (Br AS (Br ak
ake Assis
e Assist Syst t System)
em)........................... 222
Batt
Batt ery
ery
see High-voltage battery
Batt
Batt er
ery (high-v
y (high-v olt
oltag
age on-boar
e on-boar d electr
d electrical
ical
syst
syst em)
em)
see High-voltage battery
Batt
Batt er
ery (ke
y (ke y)
y)
Re placing................................................. 84
Batt
Batt er
ery (v
y (v ehicle)
ehicle)
Charging (Remo teOnline)..................... .167
No tes..................................................... 354
No tes (starting assis tance and charg-
ing)........................................................ 355
Batt
Batt er
ery oper
y oper ation
ation......................................... 162
Belt
Belt
see Seat belt
Bicy
Bicy cle r
cle r ack
ack
Load capacit y........................................ 407 Tr
ailer operatio n.................................... .274
Blind Spo
Blind Spo t Assist
t Assist
Ac tivating/deactivating.......................... 252
Fu nction................................................ 249
System limi tations.................................. 249
Blow
Blow er
er
see Clima tecont rol
BlueTEC
BlueTEC see AdBlue ®
Bonnet
Bonnet Function (active bonnet)......................... 331
Opening/closing.................................... 332
Re setting (active bonn et)........................ 331
Boo
Boo t lid t lid
see Tailgate
Br
Br ak
ak e Assis
e Assist Syst t System
em
see BAS (Brake Assist System)
Br
Br ak
ak e
e0uid
0uid
No tes..................................................... 401
Br
Br ak
ak e f
e f or
orce disce distr tribution
ibution
EBD (Elect ronic Brake forc e Distribu-
tion)....................................................... 224 Index
495
495

Br
Br
ak
ak es
es
ABS (Anti-lo ckBraking System).............. 221
Ac tive Brake Assist................................. 241
Ad aptive brake lights.............................. 226
BAS (Brake Assist System).................... .222
Driving tips............................................ 169
EBD (Electronic Brake forc e Distribu-
tion).......................................................2 24
HOLD function....................................... 225
Limited braking e.ect (salt-treated
ro ads)................................................... .169
Ne w/replaced brake linings/brake
discs...................................................... 168
Po st-collision brak e.................................. 61
Ru nning-in no tes.................................... 168
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........................................... 364
To wing away.......................................... 360
Tr anspo rting theve hicle........................ .362
Wheel chang e........................................ 378 Br
Br ea kdo
eakdo wn
wn
see Flat tyre
Butt
Butt ons
ons
St eering wheel....................................... 279 C
C
Calls
Calls Mercedes me......................................... 311
Camera
Camera
Information............................................ 220
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)............................................ 337
Car
Car -t
-to-X
o-X -Communication
-Communication
Displaying hazard warnings.................... 305
Care
Care 360° camera......................................... 342 Air-water duct........................................ 337
Au
tomatic car wash.............................. .337
Carpet................................................... 343
Decorative foil........................................ 341
Display................................................... 343
Exterior lighting...................................... 342
Head-up display..................................... 343
High-pressure cleaner............................3 39
Pa int...................................................... 340
Plastic trim............................................3 43
Re alwo od/trim elements..................... .343
Re versing camera..................................3 42
Ro of lining............................................. 343
Seat belt................................................ 343
Seat co ver............................................. 343
Sensors................................................. 342
St eering wheel....................................... 343
Ta ilpipes................................................ 342
Tr ailer hitc h............................................ 342
Ve hicle soc ketfo rth e high-voltage
battery................................................... 342
Wa shing byhand.................................... 340
Wheels/rims.......................................... 342
Wi ndo ws................................................ 342
Wi per blades.......................................... 342 496 496
Index

Car
Car
pe
pet (Car
t (Car e)
e)............................................... 343
Changing bulbs
Changing bulbs Dipped beam.........................................1 45
Fi tting/removing co ver (front wheel
ar ch )...................................................... 144
Main beam............................................. 145
No tes..................................................... 143
Overview................................................ 144
Re versing lights......................................1 45
Tu rn signal lights (rear)........................... 145
Changing g
Changing g ears ears
Manually................................................ 185
Changing hub caps
Changing hub caps ....................................... 378
Char
Char ging
ging
Char geleve l displa y............................... 211
Charg ing cable control panel.................. 200
Ending thech arging process (alternat-
ing cur rent, mode 2/3).......................... 206
Ending thech arging process (direct
cur rent, mode 4).................................... 210
Indica tor lamps on vehicle soc ket........... 201
No tes - charging station (mode 3)......... .197
No tes - fast charging station (mode 4)... .199
No tes - mains soc ket (Mode 2)............... 196 No
tes - wallbox (mode 3)........................ 197
No tes on charging the high-voltage
battery................................................... 194
On-board electrical system battery
(12 V).................................................... 357
Setting the maximum possible charg-
ing cur rent (mains soc ket)...................... 199
St arting thech arging process (alter-
nating cur rent, mode 2/3)..................... 203
St arting thech arging process (direct
cur rent, mode 4).................................... 207
St ow ing thech arging cable.................... 194
USB port............................................... .130
Char
Char ging cable ging cable
Control panel......................................... 200
St ow ing................................................. 194
Child safe
Child safe ty lock ty lock
Re ar door................................................ .79
Re ar side wind ows................................... 80
Child seat
Child seat Appr oval catego ries.................................67
At tach ing (no tes)..................................... .66
Basic instructions.................................... 61
Fr ont passenger seat (no tes).................... 76 Fr
ont passenger seat (without auto-
matic airbag shuto.)............................... .76
ISOFIX/i-Size (/tting).............................. .70
No tes on risks and danger s...................... 62
Re commendations forch ild restraint
systems................................................... 65
Seats suitable for belt-secured child
re straint systems..................................... 73
Seats suitable for i‑Size child restraint
systems................................................... 70
Seats suitable for ISOFIX child
re straint systems..................................... 68
Securing on the co-driver seat..................77
Securing on there ar seat......................... 75
To pTe ther................................................ 72
Childr
Childr en
en
Av oiding dangers in theve hicle............... .62
Basic instructions.................................... 61
Chock Chock Storage location..................................... 377
Chock Chock see Chock
City lighting
City lighting.................................................. 138 Index
497
497

Operating.............................................
.287
Displa
Displa y (on-boar
y (on-boar d com
d comput
puter)
er)
Displa yson the inst rument displa y......... 282
Displa
Displa y in t
y in the windscr
he windscr een
een
see Head-up display
Displa
Displa y message
y message
Calling up (on-board computer).............. 409
No tes..................................................... 409
Displa
Displa y messag
y messag es
es
ç - - - km/h.................................... .449
È - - - km/h..................................... 449
h - - - km/h..................................... 448
# 12 V battery See Owner's Man-
ual......................................................... 464
ò Acoustic presence indicator
inoperative............................................ .423
: Active Light System inoperative..... 417
¯ AdBlue system fault Emer. op.:
max. XXX km/h Start not poss. in
XXX km.................................................. 473 ¯
AdBlue system fault Emer gency
op. in XXX miles See Owner's Manual.... 472
¯ AdBlue system fault Engine
start not possible................................... 473
¯ AdBlue system fault See Own-
er's Manual............................................ 472
5 Add 1 litre engine oil when next
re fuelling ............................................... 474
é ATTENTION ASSIST inoperati ve..... 448
é ATTENTION ASSIS T:Take a
break!.................................................... 448
: Automatic driving lights inoper-
ative...................................................... 417
Û Battery overheated Stop, every-
body out! Outdoors if possible ................ 425
û Before starting the engine, turn
th e steering wheel..................................4 32
J Brake immediately ........................ 446
Á Change key batteries .................... 414
è Charger cable connected .............. 423 J
Check brake 0uid le vel.................. 447
ï Check trailer hitch lock (white
display message) .................................... 429
h Check tyre(s) ................................ 467
! Clean the fuel /lter....................... 437
ÿ Coolant Stop vehicle Switch
engine o............................................... 436
! currently una vailable See Own-
er's Manual............................................4 59
÷ currently una vailable See Own-
er's Manual............................................4 60
5 Engine oil le vel cannot be meas-
ured....................................................... 475
5 Engine oil le velRe duce oil le vel..... 474
5 Engine oil le velSt op vehicle
Switch engine o.................................... 474
5 Engine oil pressure Stop Switch
o. engine.............................................. 475
ä Fault Drive at max. 80 km/h ......... 458500 500
Index

6
Front leT malfunction Consult
wo rkshop (e xample)...............................4 11
& inoperative Battery low................. 420
& inoperative Char geHV battery ...... 421
& inoperati veHigh-voltage battery
ch arging inco mplete ............................... 421
& inoperative Refuel vehicle............. .421
& inoperative See Owner's Man........ 420
! inoperative See Owner's Manual.. .460
÷ inoperative See Owner's Manual.. .461
T inoperative See Owner's Manual.. .462
G Inoperative................................... 463
: Intelligent Light System inopera-
tive........................................................ 418
Á Key being initialised Please wait.... 415
Á Key not de tected (red display
message).............................................. .415
Á Key not de tected (white display
message).............................................. .415
: LeT dipped beam (e xample).......... 416 6
LeT windowbag malfunction
Consult workshop (e xample).................. 412
: Malfunction See Owner's Man-
ual.........................................................4 17
Û Malfunction Visit workshop ........... 426
d Malfunction.................................. 427
Û Malfunction.................................. 426
ð Maximum speed exceeded ............ 451
ç O................................................. 450
ë O................................................. 447
! Parking brake See Owner's
Manual..................................................4 43
d Performance se verely limited........ 427
6 Please wait Depressurising tank .... 428
& Pre-entry clima tecont rol (via
ke y) available again aTer engine start..... 422
& Pre-ent ryclimate cont rol (via
ke y) inoperati veHV-battery low .............. 422
h Rectify tyre pressure ..................... 468 Ú
Re/ll AdBlue See Owner ’sMan-
ual ......................................................... 471
! Release parking brake ...................445
¸ Replace air cleaner ....................... 437
Á Replace key.................................. 414
æ Reser vefuel le vel.......................... 437
6 Restraint sys. malfunction Con-
sult workshop ....................................... .410
# See Owner's Manual..................... 464
Ù Steering malfunction Increased
ph ysical e.ort See Owner's Manual.......4 31
Ù Steering malfunction See Own-
er's Manual ............................................ 432
Ù Steering malfunction Stop
immediately See Owner's Manual ........... 431
d Stop Switch engine o.................. .427
# Stop vehicle Lea veengine run-
ning ....................................................... 466
# Stop vehicle See Owner's Man-
ual......................................................... 465 Index
501 501

Ad
aptive Highbeam Assist Plus cur-
re ntly una vailable See Owner's Manual ... 419
Ad aptive Highbeam Assist Plus inop-
erative.................................................. .419
Anti-theT alarm system Malfunction ....... 434
Apply brake todeselect Park (P) posi-
tion....................................................... .438
Apply brake toselect D or R ...................438
Apply brake toselect R .......................... 438
Au xiliary battery malfunction (red dis-
play message) ....................................... .442
Au xiliary battery malfunction (white
displ aymessage) .................................... 442
Beginning emer gency stop..................... 452
Blind Spot Assist cur rently una vailable
See Owner's Manual.............................. 453
Blind Spot Assist inoperative.................. 454
Blind Spot Assist not available when
to wing a trailer See Owner's Manual ...... 454Cann
otstart engine See Owner's
Manual................................................. .435
Charging fault Please change charging
me thod See Owner's Manual .................424
Charging me thod cur rently una vaila-
ble Please try again or change charg-
ing me thod............................................ 424
Check brake pads See Owner's Man-
ual........................................................ .447
Check tyre pressures then restart Run
Flat Indicator......................................... 470
Clutch overheated Avoid pulling away
until thewa rning goes out...................... 441
Cruise control and Limiter inoperative.... 448
Cruise control inoperative...................... 448
Cruise control o.................................... 449
Depress clutch fully tostart engine........ 441
Device de tected at diagnostics con-
nection See Owner's Manual................. .464 Drive system Malfunction
Stop Switch
engine o............................................... 437
Drive system Malfunction Visit work-
shop ...................................................... 437
Fr ont-passenger airbag disabled See
Owner's Manual .................................... .412
Fr ont-passenger airbag enabled See
Owner's Manual .................................... .413
Hazard warning lamps malfunctioning .... 420
Head-up display cur rently una vailable
See Owner's Manual.............................. 430
Head-up display inoperative ...................431
Limiter inoperative................................. 449
Limiter passive....................................... 449
N permanently active Risk of vehicle
ro lling....................................................4 39
Not possible tounlock charging cable
See Owner's Manual.............................. 423
Only elect ric drive available Power
limited................................................... 424 Index
503 503

Ending
thech arging process (direct
cur rent, mode 4).................................... 210
Energy 0ow displa y................................. 299
General no tes on chargin g.................... .194
Indicator lamps on vehicle soc ket........... 201
No tes on charging (charging station,
mode 3)................................................ .197
No tes on charging (fast charging sta-
tion, mode 4)......................................... 199
No tes on charging (mains soc ket,
mode 2)................................................. 196
No tes on charging (wallbox, mode 3)...... 197
Ra nge.................................................... 404
Setting the maximum possible charg-
ing cur rent (mains soc ket)...................... 199
St arting thech arging process (alter-
nating cur rent, mode 2/3)..................... 203
St arting thech arging process (direct
cur rent, mode 4).................................... 207
St ow ing thech arging cable.................... 194
Ty pe....................................................... 404
Vo ltage types......................................... 404
High-v
High-v olt oltag
age on-boar
e on-boar d electr
d electrical syst
ical syst em
em
Indicator lamps on vehicle soc ket........... 201
Hill St
Hill Star art Assist
t Assist............................................ 226 HOLD function
HOLD function
Function/no tes...................................... 225
Switching on/o..................................... 225
Home scr
Home scr een (media displa een (media displa y)
y)
Overview................................................ 286
Hybr
Hybr id syst
id syst em
em
Con/guring settings via the multime-
dia system............................................. 298
Manual swit ch-o................................... .163
Hybr
Hybr id syst
id syst em
em
see Battery operation
see Electric drive I I
i-Size c
i-Size c hild seat secur
hild seat secur ing syst
ing system
em
Fi tting...................................................... 70
Seats suitable for attaching...................... 70
Identi/cation
Identi/cation plate
plate
Engine................................................... 392
Ve hicle.................................................. 392
Ignition key
Ignition key
see Key
Immediat Immediat e pr
e pre-entr
e-entr y climat
y climat e contr
e control
ol............ .158 Immobiliser
Immobiliser
.................................................... 99
Im
Im plied w
plied w arr
arranty
anty
Ve hicle..................................................... 42
Im
Im port
port er addr
er addr esses
esses
Wi reless components...............................36
In-Car
In-Car O1ce
O1ce
Fe atures................................................ 317
Indicat
Indicat or lamp
or lamp
see Warning/indicator lamp
Individual dr
Individual dr iv
ive pr
e pr ogr
ogram
am
Con/guring............................................ 180
Selecting............................................... 179
Inspection Inspection see ASS YST PLUS
Ins
Instr trument clust
ument clust er
er
Fu nction/no tes.............................. 277, 278
Ins
Ins tr
trument display
ument display
Fu nction/no tes...................................... 278
Instrument clus ter.................................... 12
Overview of displa ys............................... 282
Wa rning/indicator lamps........................ 476 Index
509
509

Ins
Ins
tr
trument displa
ument displa y and on-boar
y and on-boar d com-
d com-
put
put er
er
Fu nction/no tes...................................... 277
Int
Int ellig
ellig ent Light Syst
ent Light Syst em
em
Ac tivating/deactivating.......................... 138
Ac tive headlamps................................... 137
Ad aptive Highbeam Assis t...................... 139
Ad aptive Highbeam Assist Plu s............... 140
City lighting............................................ 138
Cornering light....................................... 138
Mo torw ay mode.................................... .138
Overview................................................ 137
Int Int ellig
ellig ent oper
ent oper ating-mode s
ating-mode str trat
at egy
egy
see Route-based operating-mode strategy
Int
Int er
erior lighting
ior lighting
Ad justing............................................... 142
Ambient lighting.................................... .142
Re ading lamp......................................... 142
Switch-o. delay time.............................. 143
Int
Int er
erior pr ot
ior pr otection
ection
Fu nction................................................ 101
Priming/deactivating............................. 101
Int
Int er
erne
ne t r
t radio
adio
see TuneIn iPhone
iPhone
®
®
see Smartphone integ ration
ISOFIX c
ISOFIX c hild seat anc
hild seat anc hor
hor
Seats suitable for attaching...................... 68
ISOFIX c
ISOFIX c hild seat secur
hild seat secur ing syst
ing syst em
em
Fi tting...................................................... 70 J
J
Jack Jack Declaration of conformity......................... 36
Storage location.................................... .377
Jum Jum p-st
p-st ar
art connection
t connection
General no tes....................................... .355 K
K
K K e ey
y
Ac oustic locking veri/cation signal.......... .83
Ac tivating/deactivating pre-entry cli-
mate control.......................................... 156
Battery..................................................... 84
Deactivating a function............................ 83
Emer gency key......................................... 84
Energy consum ption................................ 83
Fu nction overview.................................... 82 Ke
yring attachment................................. 84
Problem................................................... 85
Unlocking setting..................................... 83
KEYLESS-GO KEYLESS-GO Deactivating a function............................ 83
Locking/unlocking theve hicle................. 87
Problem................................................... 88
Unlocking setting.................................... .83
Kic Kic kdo
kdo wn
wn
Using..................................................... 186
Knee airbag
Knee airbag.................................................... 53 L
L
Lamp
Lamp see Interior lighting
Lam
Lam p (ins
p (instr trument displa
ument displa y)
y)
see Warning/indicator lamp
Lane det
Lane det ection (aut
ection (aut omatic)
omatic)
see Active Lane Keeping Assist
Lane K
Lane K eeping Assist
eeping Assist
see Active Lane Keeping Assist
Language
Language Notes..................................................... 297 510
510
Index