2021 MERCEDES-BENZ B-CLASS HATCHBACK fuse

Changing bulbs (only
forve hicles with hal-
ogen headlamps) ......................................... 147
Wi ndsc reen wipers and windscreen
wa sher system ............................................ 149
Mir rors ........................................................ 153 Climat
Climat
e contr
e control ol........................................... 157 157
Overview of climate control systems ............ 157
Operating the climate control system .......... 158 Dr
Dr
iving and par
iving and par king
king..................................... 166 166
Driving ........................................................1 66
DY NAMIC SELECT switch ........................... .182
Manual transmission ................................... 185
Au tomatic transmission .............................. .187
Fu nction of the 4MATIC ...............................1 91
Re fuelling .................................................... 191
Charging the high-voltage battery (plug-in
hy brid) ........................................................ 198
Pa rking .......................................................2 15
Driving and driving saf ety sy stems ............... 223
Tr ailer hitch ................................................ .273
Bicycle rack function ................................... 277
Ve hicle towing instructions .......................... 279 Ins
Ins
tr
trument displa
ument displa y and on-boar
y and on-boar d com-
d com-
put
put er
er........................................................... 280 280
No tes on the inst rument display and on-
board computer .......................................... 280
Overview of instrument display .................... 281
Overview of buttons on the steering wheel ... 282
Operating the on-board computer ................2 82
Fu nction of the po wer me ter (plug-in
hy brid) ........................................................ 284
Fu nction of the electric mo tor po wer
av ailability displ ay(plug-in hybrid) ................ 284
Displaying the po wer me ter (plug-in
hy brid) ........................................................ 285
Overview of displa ysinthe inst rument
display ........................................................ 285
Head-up display .......................................... 285 MBUX multimedia syst MBUX multimedia syst
em
em........................... .288
288
Overview and operation ............................... 288
System settings .......................................... 297
Plug-in hybrid settings ................................ .301
Na vigation .................................................. .302
Te lephone ................................................... 311
Mercedes me app ....................................... 314 Mercedes-Benz emer
gency call system ....... 323
Ra dio & media ............................................ .330
Sound settings ............................................ 335 Maint Maint
enance and car
enance and car e
e................................. 336 336
ASS YST PLUS service inter val display .......... 336
Engine compartment ................................... 337
Cleaning and care ....................................... 343 Br Br
eakdo
eakdo wn assist
wn assist ance
ance................................. 352 352
Emer gency .................................................. 352
Flat tyre ...................................................... 354
Battery (vehicle) .......................................... 361
To w- starting or towing away ........................ 365
Electrical fuses ............................................ 371 Wheels and tyr Wheels and tyr
es
es......................................... 374 374
No tes on noise or unusual handling char-
acteristics ................................................... 374
No tes on regula rly inspecting wheels and
tyres .......................................................... .374
No tes on snow chains ................................. 374
Ty re pressure .............................................. 375 Contents
3 3

higher
than the amount of energy actually absor-
bed bythe high-voltage batter y.This is there sult
of di.erent le vels of charging losses and is descri-
bed as rech arge e1ciency. Charging losses occur,
fo rex ample, due toheat that builds up when
ch arging or from auxiliary consumers that are
switched on. Further information on rech arge e1-
ciency can be obtained at a quali/ed specialist
wo rkshop. Se
Se
tting t
tting t he maximum per
he maximum per missible c
missible c har
harging cur-
ging cur-
r
r ent f
ent f or c
or char
harging at a mains soc ket
ging at a mains soc ket *
N
NO
OTE
TE Overloading the mains soc ket due
to excessive charging cur rent If
th ech arging cur rent is too high, the fuse
could be tripped or theex tern al mains supply
could overheat. #
Make sure that theex tern al mains supply
has been designed tohandle the set
ch arging cur rent. #
If necessar y,reduce the set charging
cur rent or use a di.erent mains soc ket. #
For saf etyre asons, only use thech arging
cable supplied with theve hicle or an
original Mercedes-Benz charging cable.
Mercedes-Benz thoroughly tests these
original charging cables forth eir suitabil-
ity for high-voltage charging of your vehi-
cle. Pur chase these parts at a Mercedes-
Benz Service Centre and obtain advice
th ere. #
Check the setting of the maximum
ch arge cur rent using thech arging capa-
city shown in the Instrument Displa y. Before
charging at a mains soc ket, ha vethe maxi-
mum permissible charging cur rent forth ere leva nt
mains soc ket or the building inspected byaqu ali-
/ed elect rician. The charging cable supplied is set
to a countr y-speci/c maximum charging cur rent
va lue. When charging abroad, the maximum value
may exceed the permitted value forth at countr y.
When abroad, obser vethe count ry-speci/c la ws
when charging. If you ha vequestions concerning
setting thech arging cur rent or if there is a mal-
function, please contact a quali/ed specialist
wo rkshop. #
Set the maximum permissible charging cur-
re nt in the multimedia system menu
(/ page 301).
If th eex act value of the maximum permissible
ch arging cur rent cannot be set, select the next
smaller adjustable value.
% Ifth eve hicle requ ires more time than usual to
ch arge the high-voltage batter y,ch eck the
maximum charging cur rent settings in the
multimedia system menu. Ov Ov
er
er vie
vie w of t
w of t he c
he char
harging cable contr
ging cable contr ol panel
ol panel The
charging cable cont rol panel sho ws the cur-
re nt status of thech arging process. Driving and parking
203
203

The
003D indicator lamp 4and status dis-
play 30ash orange and, as soon as the high-
vo ltage battery is charge d, green.
When thech arging cable is connected totheve hi-
cle, theve hicle cann otbe star ted or mo ved.
At the start of thech arging process, thech arge
le ve l display is shown in the Instrument Display
with a charging prediction. The charging predic-
tion either refers to the predicted charge leve l at
th e set departure time, or the time at which the
high- voltage battery will be fully charge d.
% Depending on thete mp erature, thefa n and
bat tery cooling system may audibly switch on
during thech arging process.
% Ifth eve hicle is idle for lengt hyperiods and
connected tothe mains suppl y,the high-volt-
age battery will be rech arge d automatically as
needed or when electrical consumers are
activated (e.g. the pre-entry climate control).
% The vehicle is equipped with an elect rical fuse
which pr otects it against overvoltage in the
mains suppl y.This electrical fuse may trip dur-
ing se vere thunderstorms, forex ample, and
may cause the fuse in the building totrip or may inter
rupt thech arging process. These
functions pr otect theve hicle.
ATer the fuse in the building is switched on
again, thech arging process resumes automat-
icall y.Fo llowing an inter ruption in the po wer
supply without the fuse in the building being
tripped, it may take up to te n minutes for
ch arging toresume automaticall y. Ending t
Ending t
he alt
he alter
ernating curr
nating curr ent c
ent char
harging pr
ging pr ocess
ocess
(mode 2/3)
(mode 2/3) R
R
eq
eq uir
uir ements:
ements:
R The dis tance between theke y and theve hicle
does not exceed 1 m. Combo 1 v
Combo 1 v ehicle socket
ehicle soc ket #
Press charging inter ruption button 3.
or #
Unlock theve hicle.
The charging process is ended. The 0036indi-
cator lamp 1lights up white. The vehicle
soc ket is unloc ked. Driving and parking
209
209

#
Tow- start theve hicle while the clutch pedal is
fully depressed. #
Slowly re leasethe clutch pedal. #
Immediately shiT toneutral if the engine
starts. #
Stop theve hicle in accordance with the tra1c
conditions. #
Remo vetheto w bar. #
Remo vetheto wing eye. #
Have theve hicle checked at a quali/ed spe-
cialist workshop. Electr
Electr
ical fuses
ical fuses N
No
ot
tes on electr
es on electr ical fuses
ical fuses &
W
WARNING
ARNING Risk of accident and injury due
to ove rloaded lines
If yo u manipulate or bridge a faulty fuse or if
yo ure place it with a fuse with a higher amper-
age, the electric line could be overloaded.
This could result in a /re. #
Alwaysre place faulty fuses with speci-
/ed new fuses containing the cor rect
amperage. *
N
NOOTE
TE Damage due toincor rect fuses Electrical components or systems may be
damaged
byincor rect fuses, or their function-
ality may be signi/cantly impaired. #
Only use fuses that ha vebeen appr oved
by Mercedes-Benz and which ha vethe
cor rect fuse rating. Blown fuses must be
replaced with fuses of the
same rating, whi chyou can recognise bythe col-
our and the label. The fuse ratings and fur ther
information tobe obser ved can be found in the
fuse assignment dia gram.
F F use assignment diagr
use assignment diagr am:
am:onthe fuse box in the
engine compartment (/ page 372). *
N
NOOTE
TE Damage or malfunctions caused by
moisture Moisture may cause damage
tothe electrical
system or cause it tomalfunction. #
When the fuse box is open, make sure
th at no moisture can enter the fuse box. #
When closing the fuse box, make sure
th at the seal of the lid is positioned cor-
re ctly on the fuse box. If
th e ne wlyinser ted fuse also blo ws, ha vethe
cause traced and recti/ed at a quali/ed specialist
wo rkshop.
Ensure thefo llowing before replacing a fuse:
R The vehicle is secured against rolling away.
R All electrical consume rsare switched o..
R The vehicle is switched o..
The elect rical fuses are located in various fuse
bo xes:
R Fuse box in the engine compartment on the
leT-hand side of theve hicle, when vie wed in
th e direction of tr avel (/ page 372) Breakdown assistance
371
371

R
Fuse box in the front passenger foot we ll
(/ page 372)
R Fuse box in the centre of the load compart-
ment (/ page 373) Opening and closing t
Opening and closing t
he fuse bo
he fuse box in t
x in the engine
he engine
com
com par
partment
tment R
R
eq
eq uir
uir ements:
ements:
R A dry clo thand a scr ewdriver are available.
Obser vethe no tes on elect rical fuses
(/ page 371).
Opening
Opening &
W
WARNING
ARNING Risk of injury from using the
windscreen wipers when the bonnet is
open
If th e windscreen wipers start moving when
th e bonnet is open, you could be trapped by
th e wiper linkage. #
Always switch o. the windscreen wipers
and vehicle before opening the engine
bonnet. #
Open the bonnet. #
Remo veany existing moisture from the fuse
box using a dry clo th. #
Loosen scr ews1. #
Press clamps 2and liT the fuse box lid up
and out. The fuse assignment diag
ram is in a recess on the
side of the fuse box.
Closing Closing #
Check whe ther the seal is positioned cor rectly
in the lid. #
Place the lid on the fuse box. #
Make sure that clamps 2engage. #
Tighten scre ws1. #
Close the bonnet. Opening and closing t Opening and closing t
he fuse bo
he fuse box in t
x in the fr
he front
ont
passeng
passeng er f
er foo
ootw
twell
ell Obser
vethe no tes on elect rical fuses
(/ page 371). 372
372
Breakdown assistance

Opening
Opening
#
LiT carpet 1inthe direction of the ar row. #
Loosen scr ews2 and remo vethe fuse box
lid from theto p.
Closing
Closing #
Place the lid on the fuse box. #
Tighten scre ws2. #
Fold back the carpet. Opening and closing t
Opening and closing t
he fuse bo
he fuse box in t
x in the load com-
he load com-
par
par tment
tment Obser
vethe no tes on elect rical fuses
(/ page 371). #
Open the load compartment 0oor. Fu
se box 1is located underneath the load com-
partment 0oor. Breakdown assistance
373
373

Displa
Displa
y messag
y messag es P
es Possible causes/conseq
ossible causes/consequences and uences and0050
0050Solutions
Solutions
:
Malfunction See Owner's
Manual *T
heexterior lighting is malfunctioning. #
Consult a quali/ed specialist workshop.
*V Vehicles wit ehicles wit h a tr
h a trailer hitc
ailer hitc h:
h:a fuse may ha veblown. #
Stop theve hicle in accordance with the tra1c conditions. #
Check the fuses and replace them if necessary (/ page 371).
:
Automatic driving lights
inoperative *T
he light sensor for automatic driving lights is malfunctioning. #
Consult a quali/ed specialist workshop.
:
Active Light System inoper-
ative *T
he active headlamps are malfunctioning. #
Consult a quali/ed specialist workshop. 420 420
Displ
aymessages and warning/indicator lamps

Easy e
Easy e
xit f
xit feature
eature
Fu nction/no tes...................................... 116
Setting................................................... 117
EBD (Electr
EBD (Electr onic Br
onic Brak
ake f
e f or
orce Dis
ce Dis tr
tribution)
ibution)
Fu nction/no tes...................................... 227
EC
EC O Assist
O Assist
Fu nction/no tes...................................... 179
EC
EC O display
O display
Fu nction................................................ 177
EC
EC O st
O st ar
ar t/st
t/st op function
op function
Switching o./on.................................... 177
Electr
Electr ic dr
ic drive
ive................................................ 166
Electr
Electr ic par
ic parking br
king br ake
ake
Applying automaticall y........................... 219
Applying/releasing manually.................. 221
Emer gency braking................................ 221
Re leasing automaticall y.......................... 220
Electr
Electr ical fuses
ical fuses
see Fuses
Electr
Electr omagne
omagne tic com
tic compatibility
patibility
Declaration of conformity........................ .29
Electr
Electr onicSt
onic Stability Pr
ability Pr ogr
ogram
am
see ESP ®
(Elect ronic Stability Prog ram) Emerg
Emerg
ency
ency
Assis tance overview................................. 20
Fire extinguisher.................................... 353
Fi rs t-aid kit (soT sided).......................... 353
Re moving thewa rning triangle............... 352
Saf etyve st............................................. 352
Setting up thewa rning triangle............... 353
Emerg
Emerg ency br
ency br aking
aking...................................... 221
Emerg
Emerg ency br
ency br aking
aking
see BAS (Brake Assist System)
Emerg
Emerg ency call
ency call
see Me rcedes-Benz emer gency call system
Eme rg
Emerg encykey
ency key
Inserting/ removing.................................. 83
Locking/unlocking the doors................... 88
Unlocking theta ilgat e.............................. 94
Emerg
Emerg ency oper
ency oper ation mode
ation mode
St arting theve hicle............................... .170
Emerg
Emerg ency
encyshut
shuto.
o.
see Hybrid system
Emerg
Emerg ency spar
ency spar e wheel
e wheel
In0ating................................................. 390
No tes..................................................... 389 Ener Ener
gy
gy0ow
0ow display
display
Displayin g.............................................. 302
Fu nction/no tes...................................... 302
Engine
Engine
Engine number....................................... 394
Starting (emer gency ope ration mode ).... 170
St arting (Remo teOnline)........................ 171
Engine data Engine data Displaying.............................................. 185
Engine electr
Engine electr onics
onics
No tes..................................................... 392
Engine number
Engine number ............................................. 394
Engine oil
Engine oil Additives................................................ 401
Capacity................................................ 402
Checking the oil le vel using the on-
board computer..................................... 340
MB-F reigabe or MB-Appr oval.................. 402
Quality................................................... 402
To pping up............................................ .340
ERA
ERA -GL -GLON
ONASS t ASS t es
est modet mode
St arting/ending.................................... .328
Err
Err or message
or message
see Display message Index
509
509