warning light MERCEDES-BENZ B-CLASS HATCHBACK 2021 Owner's Guide

&
D
DAN
AN GER
GER Risk of fatal injury due topoison-
ous exhaust gases
If th eta ilpipe is bloc ked or su1cient ventila-
tion is not possible, poisonous exhaust gases
such as carbon monoxide may enter theve hi-
cle. This is the case if theve hicle gets stuck in
sno w,forex ample. #
Keep theta ilpipe and the area around
th eve hicle free from snow when the
ve hicle or the stationary heater is run-
ning. #
Open a wind owonthe side of theve hicle
fa cing away from the wind toensure an
adequate supply of fresh air. &
W
WARNING
ARNING Risk of accident due tothe
brake system overheating
If yo u lea veyour foot on the brake pedal when
driving, the brake system may overheat.
This increases the braking distance and the
brake system can even fail. #
Never use the brake pedal as a foot re st. #
Do not depress the brake pedal and the
accelerator pedal at the same time while
driving. *
N
NOOTE
TE Engine damage due toexcessively
high engine speeds The engine will be damaged if
you drive with
th e engine in theove rrev ving range. #
Do not drive with the engine in theove r-
re vving range. *
N
NOOTE
TE Causing wearto the brake linings by
permanently depressing the brake pedal #
Do not permanently depress the brake
pedal while driving. #
Touse braking e.ect of the engine, shiT
to a lo werge ar in good time. *
N
NOOTE
TE Damage tothe driv etra in and
engine when pulling away #
Do not warm upthe engine while the
ve hicle is stationar y.Pull away immedi-
atel y. #
Avoid high engine speeds and driving at
full thro ttle until the engine has reached
its operating temp erature. *
N
NOOTE
TE Damage tothe catalytic con verter
due tonon-combusted fuel The engine is not
running smoo thly and is mis-
/ring.
Non-combus ted fuel may getinto the catalytic
con verter. #
Only depress the accelerator pedal
slightl y. #
Have the cause recti/ed immediately at
a qu ali/ed specialist workshop. 174 174
Driving and parking

Wi
th an anticipatory driving st yle, Glide mode
helps youto reduce fuel consum ption.
Glide mode is characterised bythefo llowing:
R The combustion engine is disconnected from
th e driv etra in and continues torun in neutral.
R The transmission position display 005Bis sh own
in green.
Glide mode is activated if thefo llowing conditions
are met:
R Drive prog ram ; is selected.
R The speed is within a suitable range.
R The road's course is suitable, e.g. no steep
uphill or downhill inclines or tight bends.
R There is no trailer hitched up tothe trailer
hitch, and no bicycle rack Fitted.
R You do not depress the accelerator or brake
pedal (e xcept for light brake applications).
% Glide mode can also be activated if you ha ve
selected the "Eco" setting forth e drive in the
drive prog ram =.
Glide mode is deactivated again if one of the con-
ditions is no longer met. V
V ehicles wit ehicles wit h A
h Activ
ctiv e Dist
e Dist ance Assis
ance Assist DIS t DISTR
TRONIC:
ONIC:
when Active Distance Assist DISTRONIC is acti ve,
th e glide mode function is not available.
Glide mode can also be pr evented bythefo llowing
parame ters:
R Incline
R Downhill gradient
R Temp erature
R Height
R Speed
R Operating status of the engine
R Tra1c situation
% Glide mode can be ended bypressing a steer-
ing wheel gearshiT paddle (/ page 189). F
F
unction of t
unction of t he 4MA
he 4MATIC
TIC
4MATIC ensu resth at all four wheels are driven.
To get her with ESP ®
and 4ETS, 4MATIC impr oves
th e traction of your vehicle whene ver a driven
wheel spins due toinsu1cient traction. If
yo ufa ilto adapt your driving style, 4MATIC can
neither reduce therisk of an accident nor override
th e la wsof ph ysics. 4MATIC cannot take account
of road, weather and tra1c conditions. 4MATIC is
only an aid. You are responsible especially for
maintaining a safe distance from theve hicle in
front, forve hicle speed, for braking in good time
and for st aying in lane.
% In wintry road conditions, the maximum e.ect
of 4MATIC can be achie ved only if you use
winter tyres (M+S tyres), with snow chains if
necessar y. R
R
efuelling
efuelling R
R
efuelling t
efuelling t he v
he vehicle
ehicle &
W WARNING
ARNING Risk of /re or explosion from
fuel
Fu els are highly 0ammable. #
Fire , naked 0ames, smoking and creating
spar ksmust be avoided. Driving and parking
191 191

*
N
NO
OTE
TE Damage tothe fuel system due to
ove r/lling the fuel tank #
Only /ll the fuel tank until the pump noz-
zle switches o..
If to o much fuel has been added due, for
ex ample, toafa ulty /lling pump: #
Do not switch on theve hicle. #
Consult a quali/ed specialist workshop. *
N
NOOTE
TE Fuel may spr ayout when you
re mo vethe fuel pump nozzle #
Only /ll the fuel tank until the pump noz-
zle switches o.. R
R
eq
eq uir
uir ements:
ements:
R The vehicle is unloc ked.
R Plug-in h
Plug-in h ybr
ybrid:
id:the fuel tank was depressurised
by pulling the button before theve hicle was
re fuelled. This function is countr y-dependent. %
Do not getinto theve hicle again during the
re fuelling process. Othe rwise, electrostatic
ch arge could build up again.
Obser vethe no tes on operating 0uids and fuel.
The recommended octane number foryo ur vehi-
cle can be found on the information label in the
fuel /ller 0ap.
Depr
Depr essur
essur ising t
ising t he fuel t
he fuel t ank (plug-in h
ank (plug-in h ybr
ybrid)
id) #
Pull but ton1.
Indica tor lamp 20ashes and thePlease
wait Depressurising tank message appears in
th e Instrument Displa y.
When the fuel tank is dep ressurised, indicator
lamp 2lights up continuousl y.
The Tank is depressurised Ready for refuel-
ling messa geappears in the Instrument Dis-
pla y.
% Inthefo llowing situations there is a malfunc-
tion:
R indicator lamp 20ashes initially and then
goes out
R theye llow 00B9 engine diagnosis warning
lamp lights up
The fuel tank can only be bled if the conditions
mentioned abo veare ful/lled. Otherwise, drive the
ve hicle at least 0.5 km and repeat the procedure.
% Opening the fuel /ller 0ap ma y,in exceptional
cases, take up to15 minutes. 194
194
Driving and parking

a
ch arging capacity of 10 kW or highe r,th eva lue
in thech arge leve l display is rounded o. and
shown without a decimal place.
% The value in item 3varies depending on the
setting of thech arging process. It displ aysthe
ch arging prediction, e.g. the time at which the
selected charge leve l will be reached or the
ch arge leve l at the pre-selected departure
time. P P
ar
ar king
king P
P
ar
ar king t
king t he v
he vehicle
ehicle &
W
W ARNING
ARNING Risk of accident and injury
caused byan insu1ciently secured vehi-
cle rolling away
If th eve hicle is not securely par ked su1-
cient ly,it can rollawa y in an uncontrolled way
eve n at a slight downhill gradient. #
On uphill or downhill gradients, turn the
front wheels so that theve hicle rolls
to wa rdsth eke rb if it starts moving. #
apply the parking brake. #
Vehicles with automatic transmission:
shiT the transmission toposition 005D. #
Vehicles with manual transmission:
engage /r st0047 orreve rsege ar 005E. &
W
WARNING
ARNING Risk of /re caused byhot
ex haust system parts
Flammable materials such as lea ves, grass or
twigs may ignite. #
Park theve hicle so that no 0ammable
material can come into contact with hot
ve hicle components. #
In particular, do not park on dry grass-
land or har vested grain /elds. &
W WARNING
ARNING Risk of accident and injury due
to leaving children unattended in theve hi-
cle
If ch ildren are leT unattended in theve hicle,
th ey could, in particular:
R open doors, thereby endangering other
persons or road users.
R get out and be struck byoncoming tra1c.
R operate vehicle equipment and become
trapped, forex ample.
In addition, thech ildren could also set the
ve hicle in motion by,fo rex ample:
R releasing the parking brake.
R changing the transmission position.
R starting theve hicle. #
Never lea vechildren unattended in the
ve hicle. #
When leaving theve hicle, alw aysta ke the
ke y with you and lock theve hicle. #
Keep theve hicle key out of there ach of
ch ildren. Driving and parking
215
215

Electr
Electr
ic par
ic parking br
king br ake
ake F
F
unction of t
unction of t he electr
he electric par
ic par king br
king br ak
ak e (appl
e (appl ying
ying
aut
aut omaticall
omaticall y)
y) &
W
WARNING
ARNING Risk of accident and injury due
to leaving children unattended in theve hi-
cle
If ch ildren are leT unattended in theve hicle,
th ey could, in particular:
R open doors, thereby endangering other
persons or road users.
R get out and be struck byoncoming tra1c.
R operate vehicle equipment and become
trapped, forex ample.
In addition, thech ildren could also set the
ve hicle in motion by,fo rex ample:
R releasing the parking brake.
R changing the transmission position.
R starting theve hicle. #
Never lea vechildren unattended in the
ve hicle. #
When leaving theve hicle, alw aysta ke the
ke y with you and lock theve hicle. #
Keep theve hicle key out of there ach of
ch ildren. V
V
ehicles wit
ehicles wit h manual tr
h manual tr ansmission:
ansmission:
The electr
The electr ic par
ic parking br
king br ak
ake is applied if t
e is applied if t he v
he vehicle
ehicle
is br
is br ought t
ought t o a st
o a stands
andstill and one of ttill and one of t he f
he follo
ollowing
wing
conditions is
conditions is ful/lled:
ful/lled:
R The vehicle has pr eviously been driven at
speeds greater than 3 km/h.
R The vehicle is switched o..
R The driver's door is opened.
% Toprev ent application: pull the handle of the
electric parking brake (/ page 221).
In t
In t he f
he f ollo
ollowing situations, t
wing situations, t he electr
he electric par
ic parking
king
br
br ak
ak e is also applied:
e is also applied:
R The HOLD function is keeping theve hicle sta-
tionar y.
R In addition, one of t
In addition, one of t he f
he follo
ollo wing conditions
wing conditions
mus
mus t be
t be ful/lled:
ful/lled:
- The vehicle is switched o.. -
The seat belt tongue is not inse rted in the
seat belt buckle of the driver's seat and
th e driver's door is opened.
- There is a system malfunction.
- The po wer supply is insu1cient.
- The vehicle is stationary for a lengt hy
period.
When the electric parking brake is applied, the
re d0024 indicator lamp lights up in the inst ru-
ment cluster.
If th e electric parking brake is not applied when
th e driver's door is opened, theRisk of vehicle
rolling away Apply parking brake See Owner's
Manual message appears.
% The electric parking brake is not automatically
applied if theve hicle is switched o. bythe
ECO start/s top function.
V
V ehicles wit ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission:
The electr
The electr ic par
ic parking br
king br ak
ake is applied if t
e is applied if t he tr
he tr ans-
ans-
mission is in position
mission is in position 005D
005Dand one of t
and one of t he f
he follo
ollowing
wing
conditions is
conditions is ful/lled:
ful/lled:
R The vehicle is switched o.. Driving and parking
219
219

F
F
unctions of ABS
unctions of ABS The Anti-lock Brake System (ABS)
regula testhe
brake pressure in critical driving situations:
R During braking, for instance, at maximum full-
stop braking or if there is insu1cient tyre trac-
tion, the wheels are pr evented from locking.
R Vehicle steerability while braking is ensu red.
If ABS inter venes when braking, you will feel a
pulsing in the brake pedal. The pulsating brake
pedal can be an indication of hazardous road con-
ditions and can ser veas a reminder totake extra
care while driving.
Syst
Syst em limits em limits
R ABS is acti vefrom speeds of approx. 5 km/h.
R ABS may be impaired or may not function if a
malfunction has occu rred and theye llow 0025
ABS warning lamp lights up continuously aTer
th eve hicle is star ted. F
F
unction of B
unction of B AS
AS &
W
WARNING
ARNING Risk of an accident caused by a
malfunction in BAS(Brake Assist System)
If BAS is malfunctioning, the braking distance
in an emer gency braking situation is
increased. #
Dep ress the brake pedal with full forc e in
emer gency braking situations. ABS pre-
ve nts the wheels from locking. The Brake Assist System (BAS) supports
your
emer gency braking situation with additional brake
fo rc e.
If yo u depress the brake pedal quickl y,BAS is
activated:
R BAS automatically boosts the brake pressure.
R BAS can shor tenth e braking distance.
R ABS pr events the wheels from locking.
The brakes will function as usual once youre lease
th e brake pedal. BASis deactivated. F
F
unctions of ESP
unctions of ESP ®
® &
W
WARNING
ARNING Risk of skidding if ESP ®
is
deactivated
If yo u deactivate ESP ®
, ESP ®
cannot car ryout
ve hicle stabilisation. #
ESP ®
should only be deactivated in the
fo llowing situations. The Electronic
Stability Prog ram (ESP ®
) can moni-
to r and impr ove driving stability and traction in
th efo llowing situations within ph ysical limits:
R When pulling away on wet or slippery car riage-
ways.
R When braking.
If th eve hicle deviates from the direction desired
by the driver, ESP ®
can stabilise theve hicle by
inter vening in thefo llowing ways:
R One or more wheels are braked.
R The engine output is adap ted according tothe
situation. Driving and parking
225
225

ESP
®
is deactivated if the00BB ESP®
OFF warn-
ing lamp lights up continuously in the inst rument
cluster.
Obser vethefo llowing points when ESP ®
is deacti-
va ted:
R Driving stability will no longer be impr oved.
R The drive wheels could spin.
R ETS/4ETS traction control is still active.
% When ESP ®
is deactivated, you are still assis-
te dby ESP ®
when braking.
If th e00E5 ESP®
wa rning lamp 0ashes in the
inst rument clus ter,one or se veral wheels has
re ached its grip limit:
R Adapt the driving style tosuit the pr evailing
ro ad and weather conditions.
R Do not deactivate ESP ®
under any circums tan-
ces.
R Only dep ress the accelerator pedal as far as is
necessar y. It may be best
todeactivate ESP ®
in thefo llowing
situations:
R When using snow chains.
R In deep sno w.
R On sand or grav el.
% Spinning the wheels results in a cutting
action, which enhances traction.
If th e00E5 ESP®
wa rning lamp lights up continu-
ousl y,ESP ®
is not available due toa malfunction.
Obser vethefo llowing information:
R Warning and indicator lamps (/ page 479)
R Display message s (/page 412)
ET
ET S/4ET S/4ET S (Electr
S (Electr onicTr
onic Traction Syst
action Syst em)
em)
ETS/4ETS traction cont rol is part of ESP ®
and
makes it possible topull away and accelerate on a
slippery car riag ewa y.
ETS/4ETS can impr ovetheve hicle's traction by
inter vening in thefo llowing ways:
R The drive wheels are braked individually if they
spin. R
More drive torque is tr ansferredto the wheel
or wheels with traction.
In0uence
In0uence of dr
of driv
ive pr
e pr ogr
ograms on ESP
ams on ESP ®
®
The drive prog rams enable ESP ®
to adapt todif-
fe re nt we ather and road conditions as well as the
driver's prefer red driving style. Depending on the
selected drive prog ram, the appropriate ESP ®
mode will be activated. You can select the drive
prog rams using theDY NAMIC SELECT switch
(/ page 183). F
F
unction of ESP
unction of ESP ®
®
Cr
Cr osswind Assist
osswind Assist ESP
®
Crosswind Assist de tects sudden gusts of
side wind and helps the driver tokeep theve hicle
in the lane:
R ESP ®
Crosswind Assist is active at vehicle
speeds between appr ox. 75 km/h and
200 km/h when driving straight ahead or cor-
nering slightl y.
R The vehicle is stabilised bymeans of individual
brake application on one side. 226 226
Driving and parking

F
F
unction of ESP
unction of ESP ®
®
tr
trailer st
ailer st abilisation
abilisation &
W
W ARNING
ARNING Risk of accident in poor road
and weather conditions
In poor road and weather conditions, the
trailer stabilisation cannot pr event lur ching of
th eve hicle/trailer combination. Trailers with a
high cent reofgrav ity may tip over before
ESP ®
de tects this. #
Always adapt your driving style tosuit
th e cur rent road and weather conditions. When driving with a trailer, ESP
®
can stabilise
yo ur vehicle if the trailer begins toswer vefrom
side toside:
R ESP ®
trailer stabilisation is active abo ve
speeds of 65 km/h.
R Slight swerving is reduced bymeans of a tar-
ge ted, individual brake application on one
side.
R Intheev ent of se vere swerving, the engine
output is also reduced and all wheels are
braked. ESP
®
trailer stabilisation may be impaired or may
not function if:
R The trailer is not connected cor rectly or is not
de tected proper lyby theve hicle. A
A
ctiv
ctiv ating/deactiv
ating/deactiv ating ESP
ating ESP®
®
(Electr
(Electr onicSt
onic Stability
ability
Pr
Pr ogr
ogr am)
am) Multimedia system:
4 © 5
Settings 5
Quick access
% ESP®
can only be activated/deactivated using
qu ick access when at least one other function
is available in quick access. ESP ®
can other-
wise be found in theAssistance menu. #
Select ESP. #
Select Onor00BB Off.
% If ESP ®
is deactivated and drive prog ram
Î was pr eviously selected, drive prog ram
A is automatically activated the next time
th e engine is star ted.
ESP ®
is deactivated if the00BB ESP®
OFF warn-
ing lamp lights up continuously in the inst rument
clus ter. Obser
vethe information on warning lamps and
display message s which may be shown in the
inst rument cluster. F
F
unction of EBD
unction of EBD Electronic Breakforce Distribution (EBD) is
char-
acterised bythefo llowing:
R Monitoring and regulating the brake pressure
on there ar wheels.
R Impr oved driving stability when braking, espe-
cially on bends. F
F
unction of S
unction of S TEER C
TEER CONTR
ONTROL
OL ST
EER CONTROL assists youby transmitting a
noticeable steering forc eto the steering wheel in
th e direction requ ired forve hicle stabilisation.
This steering recommendation is given in thefo l-
lowing situations:
R both right wheels or bo thleT wheels are on a
we t or slippery road sur face when you brake
R theve hicle starts toskid Driving and parking
227
227

The HOLD function is deactivated in
thefo llowing
situations:
R Active Distance Assist DISTRONIC is acti va-
te d.
R V
Vehicles wit
ehicles wit h aut
h aut omatic tr
omatic tr ansmission:
ansmission: the
transmission is shiTed toposition 005D.
R The vehicle is secured with the electric par k-
ing brake.
In thefo llowing situations, theve hicle is held by
transmission position 005Dand/or bythe electric
parking brake:
R The seat belt is unfastened and the driver's
door is opened.
R The vehicle is switched o..
R There is a system malfunction.
R The po wer supply is insu1cient.
V
V ehicles wit
ehicles wit h manual tr
h manual tr ansmission
ansmission
The Brake immediately message may also appear
in the Instrument Displa y:#
Immediately depress the brake pedal /rmly
until thewa rning message disappears.
The HOLD function is deactivated. A horn sounds at
regular inter vals if, despite the
Brake immediately message,you switch o. the
ve hicle, remo veyour seat belt and open the driv-
er's door. If you attem pttolock theve hicle, the
horn tone becomes louder. The vehicle cann otbe
loc ked until you ha vedeactivated the HOLD func-
tion.
% Once you ha veswitched o. theve hicle, you
cannot restart it until you ha vedeactivated
th e HOLD function. F
F
unction of Hill St
unction of Hill Star
art Assist
t Assist Hill
Start Assist holds theve hicle for a short time
when pulling away on a hill under thefo llowing
conditions:
R V
V ehicles wit
ehicles wit h aut
h automatic tr
omatic tr ansmission:
ansmission: the
transmission is in position 005Bor005E.
R The electric parking brake is released.
This gives you enough time tomo veyour foot
from the brake pedal tothe accelerator pedal and
depress it before theve hicle begins torollaw ay. &
W
WARNI NG
ARNI NGRisk of accident and injury due
to theve hicle rolling away
ATer a sho rttime, Hill Start Assist no lon ger
holds theve hicle. #
SwiTly mo veyour foot from the brake
pedal tothe accelerator pedal. Do not
lea vetheve hicle when it is being held by
Hill Start Assist. F
F
unction of A
unction of A dap
daptiv
tive Br
e Br ak
ake Lights
e Lights Ad
aptive Brake Lights warnfollowing tra1c in an
emer gency braking situation with thefo llowing
actions:
R By 0ashing the brake lamps
R By activating the hazard warning lights
If th eve hicle is braked sharply from speeds abo ve
50 km/h, the brake lamps 0ash rapidl y.This pro-
vides tra1c tr avelling behind you with an even
more noticeable warning.
If th eve hicle is tr avelling at speeds of more than
70 km/h at the beginning of the brake applica-
tion, the hazard warning lights switch on once the Driving and parking
229
229

ve
hicle is stationar y.When you pull away again,
th e hazard warning lights will switch o. automati-
cally at appr oximately 10 km/h. You can also
switch o. the hazard warning lights using the haz-
ard warning button. S
S
t
tar
ar t-o.
t-o. assist
assist F
F
unction of t
unction of t he
hest
star
ar t-o.
t-o. assist
assist
The start-o. assist enables optimal vehicle accel-
eration from a standstill. Forth is, a suitably high-
gr ip road sur face is requ ired, the tyres and vehicle
must also be in good condition.
Do not activate the start-o. assist on public
ro ads.
Be sure toobser vethe saf ety no tes and informa-
tion on ESP ®
(/ page 225).
A
A ctiv
ctiv ating t
ating t he
hest
starar t-o.
t-o. assist
assist &
W
WARNING
ARNING Risk of skidding and having an
accident from wheels spinning
When you use start-o. assist, individual
wheels could spin and you could lose control
of theve hicle. If ESP
®
is deactivated, there is a risk of skid-
ding and accident! #
Make sure that no persons or obs tacles
are in the close vicinity of your vehicle. #
Deactivating ESP ®
(/ page 227). #
Movethe steering wheel tothe straight-ahead
position. #
Depress the brake pedal /rmly with your leT
fo ot and keep it depressed. #
Engage the005B drive position (/ page 189). #
Select the sportiest available drive prog ram
B orC(/ page 183). #
Rapidly depress the accelerator pedal full y. #
Take your foot o. the brake, but keep the
accelerator pedal depressed.
The vehicle pulls away at maximum accelera-
tion. #
Switch on ESP ®
once the acceleration proce-
dure is comple te. ESP ®
will otherwise not be
able tostabilise theve hicle if theve hicle
starts toskid or a wheel starts tospin. Cancelling t Cancelling t
he
hest
star
ar t-o.
t-o. assist
assist #
Remo veyour foot from the accelerator pedal. #
Reactivate the ESP ®
. A A
TTENTION ASSIST TTENTION ASSIST F
F
unction of A
unction of A TTENTION ASSIST
TTENTION ASSIST
AT TENTION ASSIST assists you on long, mono to-
nous journe ys, e.g. on mo torw ays and trunk
ro ads. If ATTENTION ASSIST de tects indicators of
fa tigue or increasing lapses in concentration on
th e part of the driver, it suggests taking a break.
AT TENTION ASSIST is only an aid. It cannot
alw ays de tect fatigue or lapses in concentration in
time. The system is not a substitute for a well-res-
te d and attentive driver. On long journe ys,ta ke
re gular breaks in good time that allow for ade-
qu ate recuperation.
Yo u can choose between two settings:
R St Standar andar d:
d:normal system sensitivity.
R Sensitiv Sensitiv e: e:higher system sensitivity. The driver
is wa rned earlier and the attention le vel de tec-
te dby ATTENTION ASSIST is ada pted accord-
ingl y. 230
230
Driving and parking