2022 MERCEDES-BENZ A-CLASS SALOON Owners Manual

%
If you depress the accelerator pedal beyond
t he setting of the Active Distance Assist
DISTRONIC, the system is switched to passive
mode. The

&
WARNING Risk of accident if de tection
function of Active Distance Assist
DISTRONIC is impaired
Active Distance Assist DISTRONIC does not
r
eact or has a limited reaction:
= when driving on a diMerent lane or when
changing lanes
= to pedestrians, animals, bicycles or sta-
tionary vehicles, or unexpected obstacles
= to complex traPc conditions
= to oncoming vehicles and crossing traPc
As a result, Active Distance Assist DISTRONIC
may neither give warnings nor intervene in
such situations. 
Always observe the tr
aPc conditions
carefully and react accordingly. Operating Active Distance Assist DISTRONIC
R
equirements:
= The electric parking brake is released.
= ESP n
is activated and is not intervening. =
The tr
ansmission is in position h.
= The driver's door is closed.
= Check of the radar sensor system has been
successfully completed.
= Parking Assist PARKTRONIC is not being used
to park the vehicle or to exit from a parking
space. 
To operate Active Distance Assist
DIS TRONIC: press the rocker switches on the
steering wheel control unit up or down to the
desired position.
Switching between Active Distance Assist
DIS
TRONIC and the limiter 
Press button *.
Activating the variable limiter or Active Distance
Assis
t DISTRONIC 
To activate without a stored speed: pr
ess
rocker switch 1 up M or down N, or
select / with the les rocker switch.
or 
To activate with a stored speed: select /
wit
h the les rocker switch. 
Active Distance Assist DISTRONIC: r
emove
your foot from the accelerator pedal.
The current vehicle speed is stored and main-
tained (Active Distance Assist DISTRONIC) or
limited (variable limiter) by the vehicle.
Adopting a detected speed limit 
Activate Active Distance Assist DISTRONIC. Driving and parking
231


If a traPc sign has been detected and is dis-
played in the instrument cluster: select /
with the les rocker switch.
The maximum permissible speed on the traPc
sign is adopted as the stored speed. The vehi-
cle adapts its speed to that of the vehicle in
front, but only up to the stored speed.
Pulling away with Active Distance Assist
DIS
TRONIC 
Activate Active Distance Assist DISTRONIC
and r
emove your foot from the brake pedal. 
Select / wit
h the les rocker switch.
or 
Depress the accelerator pedal br
ieOy and
Nrmly.
The functions of Active Distance Assist
DISTRONIC continue to be carried out.
Deactivating Active Distance Assist DISTRONIC &
WARNING Risk of an accident due t
o
Active Distance Assist DISTRONIC being
active when you leave the driver's seat
If you leave the driver's seat while the vehicle
is being br
aked by Active Distance Assist
DISTRONIC only, the vehicle can roll away. 
Always deactivate Active Distance Assist
DIS

TRONIC and secure the vehicle to
prevent it from rolling away before you
leave the driver's seat. 
Select O wit
h the les rocker switch.
% If you brake, deactivate ESP n
or if ESP n
int
er-
venes, Active Distance Assist DISTRONIC is
deactivated.
Increasing/decreasing the stored speed 
1 km/h: press rocker switch 1 up M or
do
wn N to the pressure point, or press and
hold (increments of1 km/h).
or 
10 km/h: press rocker switch 1 up M or
do
wn N beyond the pressure point, or
press and hold (increments of10 km/h).
or 
Accelerate the vehicle to the desired speed
and pr

ess rocker switch 1 up M.
Changing the speciNed dis
tance to the vehicle in
front 
To reduce the speciNed dis
tance: press the
right rocker switch up ( Ñ). 
To increase the speciNed dis
tance: press the
right rocker switch down ( Ò).
Function of Active Speed Limit Assist
If a c
hange in the speed limit of 20 km/h or more
is detected and automatic adoption of speed lim-
its is activated, the new speed limit is automati-
cally adopted as the stored speed (  page 245).
The driven speed is adjusted when the vehicle is
level with the traPc sign at the latest. In the case
of signs indicating entry into an urban area, the
speed is adapted according to the speed permit-
ted within the urban area. The speed limit display 232
Driving and parking

in the Instrument Display is always updated when
t he vehicle is level with the traPc sign.
If there is no speed restriction on an unlimited
stretch of road (e.g. on a motorway), the recom-
mended speed is automatically adopted as the
stored speed. The system uses the speed stored
on an unlimited stretch of road as the recommen-
ded speed. If you do not alter the stored speed on
an unlimited stretch of road, the recommended
speed is 130 km/h.
If Active Distance Assist DISTRONIC has been put
into passive mode by pressing the accelerator
pedal, only speed limits which are higher than the
set speed are adopted.
Observe the notes on driving systems and your
responsibility; you may otherwise fail to recognise
dangers (  page 216).
System limits
The system limits of TraPc Sign Assist apply to
the detection of traPc signs ( page 244).
Speed limits below 20 km/h are not automatically
adopted by the system as the stored speed. Tem-
porary speed restrictions (e.g. for a certain time
or due to weather conditions) cannot be properly detected by the system. The maximum permissi-
ble speed appl ying to a vehicle with a trailer is not
detected by the system.
Adjust the speed in these situations. &
WARNING Risk of accident due t
o Active
Speed Limit Assist adapting the vehicle's
speed
The speed adopted by Active Speed Limit
Assis
t may be too high or incorrect in some
individual cases, such as:
= at speed limits below 20 km/h
= in wet conditions or in fog
= when towing a trailer 
Ensure that the driven speed complies
wit

h traPc regulations. 
Adjust the driving speed to suit current
tr
aPc and weather conditions. Function of route-based speed adaptation
When A

ctive Distance Assist DISTRONIC is activa-
ted, the vehicle speed will be adapted accordingly
to the route events ahead. Depending on the drive 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 234).
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 Driving and parking
233

=
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 =
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. 234
Driving and parking

%
Further information on the route-based speed
adap tation (  page 233). 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. 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 237).
The warning is not issued or is stopped when the
driver gives conNrmation to the system:
= The driver steers the vehicle. Driving and parking
235

=
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 216).
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. &
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. 236
Driving and parking

=
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 =
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. Driving and parking
237