2022 MERCEDES-BENZ B-CLASS HATCHBACK Owners Manual

program selected, the vehicle negotiates a route
e vent ahead in an economical, comfortable or
dynamic manner. When the route event has been
passed, the vehicle accelerates again to the
stored speed. The set distance to the vehicle in
front, vehicles detected ahead and speed restric-
tions ahead are taken into account.
You can activate and deactivate route-based
speed adaptation in the multimedia system
(  page 247).
The following route events are taken into account: = Bends
= T-junctions, roundabouts and toll stations
= Turns and exits
= TraPc jams ahead (only with Live TraPc Infor-
mation )
% When the toll station is reached, Active Dis-
t
ance Assist DISTRONIC adopts the speed as
the stored speed.
Also, the speed is reduced if the turn signal indi-
cat
or to change lanes is switched on and one of
the following situations is detected:
= Turning at junctions =
Dr
iving on slowing-down lanes
= Driving on lanes adjacent to slowing-down
lanes
The driver is responsible for choosing the right
speed and observing other road users. This
applies in particular to junctions, roundabouts and
traPc lights, as route-based speed adaptation
does not brake the vehicle to a standstill.
When route guidance is active, the Nrst speed
adjustment is carried out automatically. If the turn
signal indicator is switched on, the selected route
is conNrmed and further speed adjustment is acti-
vated.
Speed adaptation is cancelled in the following
cases:
= If the turn signal indicator is switched oM
before the route event.
= If the driver depresses the accelerator or
brake pedal during the process.
System limits
Route-based speed adaptation does not take right
of way regulations into account. The driver is responsible for complying with road
tr aPc regula-
tions and driving at a suitable speed.
The speed adaptation made by the system may
not always be suitable, particularly in the following
situations:
= the road's course not clearly visible
= Road narrowing
= varying maximum permissible speeds in indi-
vidual lanes, forexample at toll stations
= wet road surfaces, snow or ice
= when towing a trailer
In these situations the driver must intervene
accordingly. &
WARNING Risk of accident in spit
e of
route-based speed adaptation
Route-based speed adaptation can malfunc-
tion or be t
emporarily unavailable in the fol-
lowing situations:
= If the driver does not follow the calculated
route 246
Driving and parking

=
If map dat a is not up-to-date or available
= In the event of roadworks
= In bad weather or road conditions
= If the accelerator pedal is depressed
= In the event of electronically displayed
speed limitations 
Adapt the speed to the tr
aPc situation.Setting route-based speed adaptation
R

equirements:
= Active Distance Assist DISTRONIC is activa-
ted.
= ECO Assist is active.
Multimedia system: 4 © 5
Settings 5
Assistance
5 Route-based speed adapt. 
Activate or deactivate the function.
When t
he function is active, the vehicle speed
is adjusted depending on the route events
ahead. %
Further information on the route-based speed
adap
tation (  page 245). Active Steering Assist
Function of Active Steering Assist
A

ctive Steering Assist is only available up to a
speed of 210 km/h. The system helps you to stay
in the centre of the lane by means of moderate
steering interventions. Depending on the speed
driven, Active Steering Assist uses the vehicles
ahead and lane markings as a reference.
% Depending on the country, in the lower speed
r
ange Active Steering Assist can use the sur-
rounding traPc as a reference. If necessary,
Active Steering Assist can then also provide
assistance when driving outside the centre of
the lane, forexample, to form a rescue lane.
If the detection of lane markings and vehicles
ahead is im
paired, Active Steering Assist switches
to passive mode. The system provides no support
in this case. Status display of Active Steering Assist in the
Ins
trument Display
= Ø (grey): activated and passive
= Ø (green): activated and active
= Ø (red): system limits detected
= Ø (white, red hands): "hands on the steer-
ing wheel" prompt
% During the transition from active to passive
s

tatus, the Ø symbol is shown as enlarged
and Oashing. Once the system is passive, the
Ø symbol is shown as grey in the Instru-
ment Display.
% Depending on the selected vehicle settings,
A

ctive Steering Assist may be unavailable.
Steering and touch detection
The dr
iver is required to keep their hands on the
steering wheel at all times and be able to inter-
vene at any time to correct the course of the vehi-
cle and keep it in lane. The driver must expect a
change from active to passive mode or vice versa
at any time. Driving and parking
247

If the system detects that the driver has not
s
teered the vehicle for a considerable period of
time or has removed their hands from the steering
wheel, display 1 appears. If the driver still does
not steer the vehicle, a warning tone sounds in
addition to the visual warning message.
If the driver does not react to the warning for a
considerable period, the system can initiate an
emergency stop ( page 249).
The warning is not issued or is stopped when the
driver gives conNrmation to the system:
= The driver steers the vehicle. =
Depending on t
he country: the driver presses
a steering wheel button or operates Touch
Control
If Active Steering Assist detects that a system
limit has been reached, a visual warning is issued
and a warning tone sounds.
Observe the notes on driving systems and your
responsibility; you may otherwise fail to recognise
dangers (  page 228).
System limits
Active Steering Assist has a limited steering tor-
que for lateral guidance. In some cases, the steer-
ing intervention is not suPcient to keep the vehi-
cle in the lane or to drive through exits.
The system may be impaired or may not function
in the following instances:
= There is poor visibility, e.g. due to snow, rain,
fog, heavy spray, greatly varying light condi-
tions or strong shadows on the carriageway.
= There is glare, e.g. from oncoming traPc,
direct sunlight or reOections.
= *nsuPcient road illumination. =
The windscr een is dirty, misted up, damaged
or covered in the vicinity of the camera, e.g.
by a sticker.
= No, or several, unclear lane markings are pres-
ent for one lane, or the markings change
quickly, forexample, in a construction area or
junctions.
= The lane markings are worn away, dark or cov-
ered up, e.g. by dirt or snow.
= If the distance to the vehicle in front is too
short and thus the lane markings cannot be
detected.
= The road is narrow and winding.
= There are obstacles on the lane or projecting
out into the lane, suchas object markers.
The system does not provide assistance in the fol-
lowing conditions:
= On tight bends and when turning.
= When crossing junctions.
= At roundabouts or toll stations.
= When towing a trailer.
= When the tyre pressure is too low. 248
Driving and parking

&
WARNING Risk of accident if A ctive Steer-
ing Assist unexpectedly stops functioning
If the system limits of Active Steering Assist
ar
e reached there is no guarantee that the
system will remain active or will keep the vehi-
cle in lane. 
Always keep your hands on the steering
wheel and obser
ve the traPc carefully. 
Always steer the vehicle paying attention
t

o traPc conditions. &
WARNING Risk of accident if A
ctive Steer-
ing Assist unexpectedly intervenes
The detection of lane markings and objects
ma
y malfunction and cause unexpected steer-
ing interventions. 
Steer according to tr
aPc conditions. Activating/deactivating Active Steering Assist
R

equirements:
= ESP n
is activated, but is not intervening. =
A
ctive Distance Assist DISTRONIC is activa-
ted.
Multimedia system: 4 © 5
Settings 5
Quick access 
Select O Act. Steer. Asst . Function of Active Emergency Stop Assist
If the system detects that the driver has not
s

teered the vehicle for a considerable period of
time or has removed their hands from the steering
wheel, display 1 appears in the Instrument Dis-
play. If the driver still does not steer the vehicle,
or gives no conNrmation to the system, a warning tone sounds in addition to the visual warning mes-
sag

e.
If the driver still does not respond to the warning,
the Beginning emergency stop message appears
in the Instrument Display. If the driver still does
not respond, Active Distance Assist DISTRONIC
reduces the speed. The vehicle is decelerated in
stages to a standstill.
Depending on the country, at speeds below
60 km/h the hazard warning lights switch on
automatically.
When the vehicle is stationary, the following
actions are carried out:
= The vehicle is secured with the electric park-
ing brake.
= Active Distance Assist DISTRONIC is ended.
= The vehicle is unlocked.
= If possible, an emergency call is placed to the
Mercedes-Benz emergency call centre.
The driver can cancel the deceleration at any time
by performing one of the following actions: = Steering Driving and parking
249

=
Br aking or accelerating
= Deactivating Active Distance Assist
DISTRONIC Active Brake Assist
Function of Active Brake Assist
A

ctive Brake Assist consists of the following func-
tions:
= Distance warning function
= Autonomous braking function
= Situation-dependent braking assistance
= Vehicles with Driving Assistance Package: Eva-
sive Steering Assist and cornering function
Active Brake Assist can help you to minimise the
risk of a collision with vehicles, cyclists or pedes-
trians or to reduce the eMects of such a collision.
If Active Brake Assist has detected a risk of colli-
sion, a warning tone sounds and the / dis-
tance warning lamp lights up in the instrument
cluster. Vehicles with PRE-SAFE
n
: depending on t
he coun-
try, an additional haptic warning occurs in the
form of slight, repeated tensioning of the seat
belt.
If you do not react to the warning, autonomous
braking can be initiated in critical situations.
In especially critical situations, Active Brake Assist
can initiate autonomous braking directly. In this
case, the warning lamp and warning tone occur
simultaneously with the braking application.
If you apply the brake yourself in a critical situa-
tion or apply the brake during autonomous brak-
ing, situation-dependent braking assistance
occurs. The brake pressure increases up to maxi-
mum full-stop braking if necessary.
Observe the notes on driving systems and your
responsibility; you may otherwise fail to recognise
dangers ( page 228). If autonomous braking or situation-dependent
br

aking assistance has occurred, display 1
appears in the Instrument Display and then auto-
matically goes out aser a short time.
If the autonomous braking function or the situa-
tion-dependent braking assistance is triggered,
additional preventive measures for occupant pro-
tection (PRE-SAFE n
) may also be initiated. &
WARNING Risk of an accident caused b
y
limited detection performance of Active
Brake Assist
Active Brake Assist cannot always clearly iden-
tify objects and com
plex traPc situations. 250
Driving and parking

In such cases, Active Brake Assist might:
= Giv
e a warning or brake without reason
= Not give a warning or not brake
Active Brake Assist is only an aid. The driver is
responsible for maintaining a suPciently safe
distance to the vehicle in front, vehicle speed
and for braking in good time. 
Always pay careful attention to the tr
aPc
situation; do not rely on Active Brake
Assist alone. 
Be prepared to brake or swerve if neces-
sar

y. If Active Brake Assist is deactivated or the func-
tions ar
e restricted, e.g. due to activation of
another driving system, the ê display message
appears in the driver's display.
If the system is unavailable due to dirty or dam-
aged sensors or due to a fault, or if the functions
are restricted, the

=
at speeds up t o approximately 80 km/h when
approaching moving pedestrians and cyclists
ahead
= at speeds up to approximately 70 km/h when
approaching stationary pedestrians, crossing
vehicles and stationary and crossing cyclists
Autonomous braking function (vehicles without
Driving Assistance Package)
If the vehicle is travelling at speeds above approx-
imately 7 km/h, the autonomous braking function
may intervene in the following situations:
= at speeds up to approximately 200 km/h
when approaching vehicles ahead
= at speeds up to approximately 80 km/h when
approaching cyclists ahead
= at speeds up to approximately 60 km/h when
approaching moving pedestrians, crossing
cyclists, and stationary vehicles Autonomous braking function (vehicles with Driv-
ing Assis
tance Package)
If the vehicle is travelling at speeds above approx-
imately 7 km/h, the autonomous braking function
may intervene in the following situations:
= at speeds up to approximately 250 km/h
when approaching vehicles ahead
= at speeds up to approximately 100 km/h
when approaching stationary vehicles
= at speeds up to approximately 80 km/h when
approaching cyclists ahead
= at speeds up to approximately 70 km/h when
approaching stationary and moving pedes-
trians, crossing vehicles and stationary and
crossing cyclists
Situation-dependent braking assistance (vehicles
without Driving Assistance Package)
The situation-dependent braking assistance can
intervene from a speed of approximately 7 km/h
in the following situations:
= at speeds up to approximately 250 km/h
when approaching vehicles ahead =
at speeds up t o approximately 80 km/h when
approaching stationary vehicles and cyclists
ahead
= at speeds up to approximately 60 km/h when
approaching moving pedestrians and crossing
cyclists
Situation-dependent braking assistance (vehicles
with Driving Assistance Package)
The situation-dependent braking assistance can
intervene from a speed of approximately 7 km/h
in the following situations:
= at speeds up to approximately 250 km/h
when approaching vehicles ahead
= at speeds up to approximately 100 km/h
when approaching stationary vehicles
= at speeds up to approximately 80 km/h when
approaching cyclists ahead
= at speeds up to approximately 60 km/h when
approaching stationary and moving pedes-
trians, crossing vehicles, and stationary and
crossing cyclists 252
Driving and parking

Cancelling a brake application of Active Brake
Assis t
You can cancel a brake application of Active
Brake Assist at any time by: = sharply depressing the accelerator pedal or
with kickdown
= releasing the brake pedal
Active Brake Assist may cancel the brake applica-
tion when one of the following conditions is fulNl-
led:
= You manoeuvre to avoid the obstacle.
= There is no longer a risk of collision.
= An obstacle is no longer detected in front of
your vehicle.
Evasive Steering Assist (only vehicles with Driving
Assistance Package)
Evasive Steering Assist has the following charac-
teristics:
= The ability to detect stationary or moving
pedestrians.
= Assistance through power-assisted steering if
it detects a swerving manoeuvre. =
A ctivation by an abrupt steering movement
during a swerving manoeuvre.
= Assistance during swerving and straightening
of the vehicle.
= Reaction from a speed of approximately
20 km/h up to a speed of approximately
70 km/h.
You can prevent the assistance at any time by
actively steering.
Cornering function (only vehicles with Driving
Assistance Package)
If the system detects a risk of a collision with an
oncoming vehicle when turning across an oncom-
ing lane, autonomous braking can be initiated at
speeds below 15 km/h before you have les the
lane in which you are driving. &
WARNING Risk of accident despit
e Eva-
sive Steering Assist
Evasive Steering Assist cannot always recog-
nise objects or com
plex traPc situations
clearly. Moreover, the steering support provided by
Ev

asive Steering Assist is not suPcient to
avoid a collision. 
Always pay careful attention to the tr
aPc
situation; do not rely on Evasive Steering
Assist alone. 
Be prepared to brake or swerve if neces-
sar

y. 
End the support by actively steering in
non-cr
itical situations. 
Drive at an appropriate speed if there
ar

e pedestrians close to the path of your
vehicle. System limits
F

ull system performance is not yet available for a
few seconds aser switching on the vehicle or aser
driving oM.
The system may be impaired or may not function,
particularly in the following situations:
= In snow, rain, fog, heavy spray, if there is glare,
in direct sunlight or in greatly varying light
conditions. Driving and parking
253