2021 MERCEDES-BENZ A-CLASS HATCHBACK ECU

F
F
olding t
olding t he ball nec
he ball nec k out
k out #
Pull switch 2until the ball neck unloc ks.
The ball neck will fold out from under there ar
bumper.
Indicator lamp 1will 0ash. #
Pull the ball neck in the direction of the ar row
until it engages audibly in a vertical position.
Indicator lamp 1onthe ball neck release
switch will go out.
If th e ball neck is not securely loc ked in place,
th eTrailer coupling Check lockmessage will
appear on the inst rument displa y. #
Remo vethe co ver cap from the ball head and
store it in a safe place. Make sure
that the ball on the ball neck is clean.
Check that it is either greased or dry (g rease-
free), depending on the inst ructions forth e trailer.
F
F olding t olding t he ball nec
he ball nec k in
k in #
Pull switch 2until the ball neck unloc ks.
The ball neck will fold up under there ar
bumper.
Indicator lamp 1will 0ash. #
Push the ball neck in the direction of the
ar ro w until it engages audibly behind the
bumper.
Indicator lamp 1will go out and the message
on the inst rument display will disappear.
Obser vethe information about the displa yson the
inst rument cluster:
R Indicator and warning lamps (/ page 476)
R Display message s (/page 409) Coupling up/uncoupling a tr Coupling up/uncoupling a tr
ailer
ailer R
R
eq
eq uir
uir ements:
ements:
R The ball neck is extended and engaged in a
securely loc ked position. 272
272
Driving and parking

Tr
ailers with a 7-pin plug can be connected tothe
ve hicle with thefo llowing adap ters:
R Adapter plug
R Adapter cable
The trailer will be cor rectly de tected bytheve hi-
cle only if thefo llowing conditions are met:
R The trailer is connected cor rectl y.
R The trailer lighting system is in working order.
The functions of thefo llowing systems will be
a.ec tedbya cor rectly connected trailer:
R ESP ®
trailer stabilisation
R Active Lane Keeping Assist
R Parking Assist PARKTRONIC
R Active Parking Assist
R Blind Spot Assist or Active Blind Spot Assist
R Drive Away Assist
R Cross Tra1c Ale rt
R Reversing camera
R 360° Camera Coupling up a tr
Coupling up a tr ailer
ailer
* NO
NOTE
TEDamage tothe star ter battery due
to full dis charge Charging
the trailer battery using the po wer
supply of the trailer can damage the star ter
batter y. #
Do not use theve hicle's po wer supply to
ch arge the trailer batter y. #
Remo vethe co ver cap from the ball head and
store it in a safe place. #
Position the trailer on a le vel sur face behind
th eve hicle and couple it up totheve hicle. #
Open the soc ket cap. #
Inse rtthe plug with lug 1ingroo ve 3 on
th e soc ket. #
Turn bayonet coupling 2totheright as far as
it will go. #
Let the cap engage. #
Secure the cable tothe trailer with cable ties
(only if you are using an adap ter cable). #
Make sure that the cable is alw ays slack for
ease of mo vement during cornering.
Under thefo llowing conditions, a message may
appear on the inst rument display even if the
trailer has been connec ted cor rectl y:
R LEDs ha vebeen ins talled in the trailer lighting
system.
R The cur rent has fallen below the trailer lighting
system's minimum cur rent (50 mA).
% Accessories can be connected tothe perma-
nent po wer supply up to180 W and tothe
po we r supply that is switched on via the igni-
tion loc k. Driving and parking
273
273

U
U
ncoupling a tr
ncoupling a tr ailer
ailer &
W
WARNI NG
ARNI NGRisk of being crushed and
becoming trapped when uncoupling a
trailer
When uncoupling a trailer with an engaged
inertia-activated brake, your hand may
become trapped between theve hicle and the
trailer dr awbar. #
Do not uncouple trailers with an engaged
ove rrun brake. *
N
NOOTE
TE Damage during uncoupling with an
engaged overrun brake The
vehicle may be damaged if you uncouple
with an engaged overrun brake. #
Do not uncouple trailers with an engaged
ove rrun brake. #
Secure the trailer against rolling away. #
Disconnect the electrical connection between
th eve hicle and the trailer. #
Uncouple the trailer. #
Place the co ver cap on the ball head.
% T
Tr
railer
ailer s wit
s wit h LED lighting:
h LED lighting: aTer uncoupling the
traile r,switch theve hicle on and then o.
again. Bicy
Bicy
cle r
cle r ac
ack function
k function &
W
WARNING
ARNING Risk of an accident if the bicy-
cle rack is used incor rectly
The bicycle rack may become de tach ed from
th eve hicle in thefo llowing cases:
R the permissible load capacity of the trailer
hitch is exceeded.
R the bicycle rack is used incor rectl y.
R the bicycle rack is secured tothe ball neck
beneath the ball head.
Obser vethefo llowing foryo ur ow n sa fety and
th at of other road users:
R always adhere tothe permissible load
capacity of the trailer hitch. R
always obser vethe permissible rear axle
load of theto wing vehicle.
R use the bicycle rack only totransport bicy-
cles.
R always proper lysecure the bicycle rack by
attaching it tothe ball head.
R use only bicycle rack s appr ovedby
Mercedes-Benz.
R always obser vethe bicycle rack operating
instructions. *
N NOOTE TE Damage toor breakage of the trailer
hitch due tounsuitable or improper lyused
bicycle rack. #
Only use bicycle rack s appr ovedby
Mercedes-Benz prope rly as described
bel ow. *
N
NO
O TE
TE Increased risk of damage toprop-
erty due tofolded-out ball neck #
When the trailer is not coupled or the
bicycle rack is attached, fold in the ball 274
274
Driving and parking

neck or, in
the case of a fully electric
trailer hitch, retract the ball nec k. Depending on
the bicycle rack 's design, up to
th re e bicycles can be transpor ted on the bicycle
ra ck.
When mounted byattaching toball head 1,the
maximum load capacity is 75 kg. The maximum load capacity is calculated from
the
we ight of the bicycle rack and the bicycle rack
load.
Obser vethe no tes on driving with a roof load,
trailer or fully laden vehicle (/ page 169).
When using a bicycle rack , set the tyre pressure
fo r increased load on there ar axle of theve hicle.
Fu rther information on the tyre pressure can be
fo und in the tyre pressure table (/ page 370).
N
No ot tes on loading
es on loading
The lar gerth e distance between the load's centre
of grav ity and the ball head, thegr eater the load
on the trailer hitch.
Therefore, obser vethefo llowing no tes:
R mount heavy bicycles as close totheve hicle
as possible
R always distribute the load on the bicycle rack
as evenly as possible across theve hicle's lon-
gitudinal axis
Mercedes-Benz recommends removing all de tach-
able parts from bicycles (e.g. bask ets, ch ild seats,
re ch arge able batteries) before loading them onto
th e bicycle rack . This will impr ovethe aerody- namic
resis tance and centre of grav ity of the bicy-
cle rack.
Alw ays secure the bicycles toprev ent them from
moving around and check them at regular inter-
va ls to ensure that they are secure.
Do not use tarp aulins or other co vers. The driving
ch aracteristics and rear view may be impaired. In
addition, aerodynamic resis tance and the load on
th e trailer hitch will increase. Load distribution on
the bicycle rack
1 Vertical distance between centre of grav ity
and ball head Driving and parking
275
275

F
F
unction of t
unction of t he pow
he power met
er meter (plug-in h
er (plug-in h ybr
ybrid)
id) 1
Combustion engine and electric mo tor
switched o.
2 Position in the display range of there co vered
energy
3 End of the display range of there co vered
energy
4 End of the display range of the combined out-
put of thehy brid system The
following functions of the po wer me ter are
per form ed:
R The po wer me ter supports you in electric-only
mode and displa ys the output obtained from
th ehy brid system.
R Regenerated energy is sh own in area 1–
3.
R When the po wer me ter needle is at position
1, theve hicle is switched o.. The combus-
tion engine and the electric mo tor are
switched o..
R Pow errange 3–4 show sth e combined
output of thehy brid system. F
F
unction of t
unction of t he electr
he electric mot
ic motor pow
or pow erav
er availability
ailability
displa
displa y (plug-in h
y (plug-in h ybr
ybrid)
id) 1
Start of the POWER display range
2 End of the POWER display range
3 Maximum recuperated energy
4 Start of the display range of there cuperated
energy
5 Current state of charge ofthe high-voltage
battery
R Area 1-2 shows th e output in electric
mode or boost mode. The POWER display sup-
ports you in electric-only mode.
R Area 3-4 shows th ere cuperated energy. Instrument display and on-board computer
281 281

R
From point 3,the maximum recuperated
energy has been reached.
R The cur rent state of charge of high-voltage
battery 5is displa yed. Displa
Displa
ying t
ying the pow
he pow er met
er meter (plug-in h
er (plug-in h ybr
ybrid)
id)
On-board computer: 4 Content #
Select Power meter. Ov
Ov
er
ervie
vie w of display
w of display s in t
s in the ins
he ins tr
trument display
ument display
Displa yson the inst rument displa y:
u Active Parking Assist (/ page 266)
é Parking Assist PARKTRONIC deactivated
(/ page 264)
h Cruise control (/ page 229)
È Limiter (/ page 229)
ç Active Distance Assist DISTRONIC
(/ page 232)
æ Active Brake Assist (/ page 241) à
Active Steering Assist (/ page 238)
à Active Lane Keeping Assist (/ page 252)
ò Sound generator inoperative (/ page 423)
è ECO start/stop function (/ page 172)
ë HOLD function (/ page 225)
_ Adaptive Highbeam Assist (/ page 139)
Ad aptive Highbeam Assist Plus
(/ page 140)
ð Maximum permissible speed exceeded (for
cer tain countries only)
V
V ehicles wit
ehicles wit h Speed Limit Assist:
h Speed Limit Assist: detected
instructions and tra1c signs (/ page 246).
V
V ehicles wit
ehicles wit h
hTr
Tra1c
a1c Sign Assist:
Sign Assist: detected instruc-
tions and tra1c signs (/ page 247). Head-up display
Head-up display
F
F
unction of t
unction of t he head-up display
he head-up display *
N
NOOTE
TE Mercedes-AMG vehicles #
Obser vethe no tes in the Supplement.
Yo u could otherwise failto recognise
dangers. The head-up display projects
thefo llowing infor-
mation into the driver's /eld of vision abo vethe
cockpit, forex ample:
R The vehicle speed
R Information from the navigation system
R Information from the driving systems and driv-
ing saf ety sy stems
R Some warning messages
Depending on theve hicle's equipment, di.erent
content can be shown in theth re e areas of the
head-up displ ay (/page 283). 282
282
Inst
rument display and on-board computer

Example: if
the option is switched on and a
ro ute toa new destination has been calcula-
te d, this destination would not be take n into
account forth e learning function.
Cr
Cr eating ne
eating ne w t
w themes
hemes #
Select ©. #
Select THEMES. #
Select WSet theme .
The settings which are sa ved in theth eme are
shown. #
Select Continue r. #
Select AudioandNavigation (Navigation) and
store the active settings in theth eme. #
Select Continue r. #
Select an entry screen. #
Select Continue r. #
Select an image. #
Enter the names into the entry /eld and con-
/rm with a. #
Select Save. Syst
Syst
em se
em se ttings
ttings Ov
Ov
er
ervie
vie w of t
w of t he sy
he syst
stem se
em se ttings menu
ttings menu In
the system settings menu, you can make set-
tings in thefo llowing menus and control ele-
ments:
R Display
- Styles
- Instrument lighting
- Display brightness
- Edge lighting
- Day/night design
R Control elements
- Keyboard language and handwriting recog-
nition
- Sensitivity of theto uchpad
- Sensitivity of theTo uch Controls
R LINGU ATRO NIC
R Sound
- Enter tainment
- Navigation and tra1c announcements -
Telephone
- Voice ampli/cation tothere ar
R Connectivity
- Wi-Fi, Blue tooth ®
, NFC
R Time & date
R Language
R Units for distance
R SoTware updates
R Data import/export
R PIN pr otection
R System Reset Inf
Inf
or
ormation on im
mation on im port
portant syst
ant syst em updat
em updat es
es Impor
tant system updates may be necessary for
th e security of your multimedia system's data.
Install these updates, or else the security of your
multimedia system cannot be ensured.
A system update consists of thre e steps:
R Downloading or copying of the data requ ired
fo r installation
R Installation of the downloaded system update 294 294
MBUX multimedia system

%
The connection procedure may di.er depend-
ing on the device. Follow the inst ructions that
are shown in the displa y.Fu rther information
can be found in the manufacturer's operating
inst ructions. #
Select Internet settings .#
Select Connect via Wi-Fi .#
Select Add hotspot.
Connecting using a QR code
Connecting using a QR code #
Select the options rofthe desired Wi-Fi
networ k. #
Select Connect using QR code. #
Scan the displa yed QR code with the device to
be connected.
The Wi-Fi connection is established.
Connecting using a secur Connecting using a secur itykey
ity key #
Select the options rofthe desired Wi-Fi
networ k. #
Select Connect using security key. #
Have the security key displa yed on the device
to be connected (see the manufacturer's oper-
ating inst ructions). #
Enter this security key on the multimedia sys-
te m. #
Con/rm the entry with ¡.
Connecting using a WPS PIN
Connecting using a WPS PIN #
Select the options rofthe desired Wi-Fi
networ k. #
Select Connect using WPS PIN input.
The multimedia system generates an eight-
digit PIN. #
Enter this PIN on the device tobe connected. #
Con/rm the entr y.
Connecting using a butt
Connecting using a butt on
on #
Select the options rofthe desired Wi-Fi
networ k. #
Select Connect via WPS PBC. #
Select "Connect via WPS PBC" in the options
on the device tobe connected (see the manu-
fa cturer's operating instructions). #
Press the WPS button on the device tobe con-
nected. #
Select Continue inthe multimedia system.
A
A ctiv
ctiv ating aut
ating aut omatic connection
omatic connection #
Select Connect via Wi-Fi. #
Select the options rofthe desired Wi-Fi
networ k. #
Activate Permanent Internet connection .
Connecting wit
Connecting wit h a kno
h a known W
wn Wi-F
i-Fi ne
i ne tw
twork
ork #
Select Connect via Wi-Fi. #
Select a Wi-Fi networ k.
The connection is established again.
Con/gur
Con/gur ing
ingt
the multimedia syst
he multimedia syst em as a W
em as a Wi-F
i-Fi ho
i ho t-
t-
spo
spo t f
t for e
or e xt
xter
er nal de
nal de vices
vices
The type of connection established depends on
th e device tobe connected. The function must be
suppor tedby the multimedia system and bythe
device tobe connected. The type of connection
established must be selected on the multimedia
system and on the device tobe connected. #
Select Vehicle hotspot. 296 296
MBUX multimedia system