keyless MERCEDES-BENZ A-CLASS HATCHBACK 2021 Owners Manual

W
W
ir
ireless applications in t
eless applications in t he v
he vehicle
ehicle T
T
ec
ec hnology Fr
hnology Freq
eq uency r
uency r angeT r
ang eT ransmission output/magne
ansmission output/magne tic
tic/eld
/eld s
strtr eng th
ength
Re mo teKeyless Entr y2 0 kHz (9–90 kHz) ≤ 72 dBμA/m at 10m
Wi reless Powe rTr ansmission 105 kHz (90–119 kHz)≤ 42 dBμA/m at 10m
Re mo teKeyless Entr y1 20 kHz (119–135 kHz) ≤ 42 dBμA/m at 10m
Wi reless Powe rTr ansmission 127 kHz (119–135 kHz)≤ 66 dBμA/m at 10m withthe magnetic /eld
strength le vel decreasing 3dB/oct aveabove119
kHz
Ne ar-/eld communication 13.553–13.567 MHz≤ 42 dBμA/m at 10m
Re mo teKeyless Entr y,Garage Door Opener, Tire
Pressure Monitoring 433 MHz (433.05–434.79 MHz)
≤ 10 mW ERP
Block Heater Remo teControl, Garage Door
Opener 868 MHz (868.0–868.6 MHz)≤
25 mW ERP
Block Heater Remo teControl, Garage Door
Opener 869 MHz (868.7–869.2 MHz)≤
25 mW ERP
Blue toot h, Kleer, RLAN, wireless Headphone s2.4 GHz ISM band (2400–2483.5 MHz) ≤ 100 mW EIRP
RLAN 5.1 GHz UNII-1 (5150–5250 MHz)≤ 25 mW EIRP32
32
General no
tes

T
T
ec
ec hnology Fr
hnology Freq
eq uency r
uency r angeT r
ang eT ransmission output/magne
ansmission output/magne tic
tic/eld
/eld s
strtr eng th
ength
Interior Monitoring Radar, RLAN 5.8 GHz UNII-3 (5725–5875 MHz)≤ 25 mW EIRP
Re mo teKeyless Entr y7 .25 GHz UWB (6.0–8.5 GHz) ≤ -41.3 dBm/MHz EIRP mean ≤ 0 dBm/MHz
EIRP peak
76 GHz radar 76–77 GHz ≤ 55 dBm peak EIRP
Carsharing Module NFC:
NFC:
13.553–13.567 MHz
Bluet Bluet ooth
oo th®
®
:
:
2402–2480 MHz NFC:
NFC:
≤ 42 dBμA/m at 10 m
Bluet Bluet
ooth
oo th®
®
:
:
≤ +4 dBm (class 2)
Re ar Seat Enter tainment System
Bluet
Bluet ooth
oo th®
®
:
:
2400–2483.5 MHz
WL WL AN 2.4 GHZ:
AN 2.4 GHZ:
2400–2483.5 MHz
WL WL AN 5 GHz:
AN 5 GHz:
5150–5250 MHz
5725–5875 MHz Bluet Bluet
ooth
oo th®
®
:
:
-0.8 dBm
WL WL AN 2.4 GHZ:
AN 2.4 GHZ:
14.5 dBm
WL WL AN 5 GHz:
AN 5 GHz:
20.5 dBm
13.3 dBm
Tw o-w ayradio (Tel7 telephone control unit) E-GSM (900 MHz)
GSM (1800 MHz) +33 dBm
+30 dBm General no
tes
33 33

A
A
ctiv
ctiv ating/deactiv
ating/deactiv ating t
ating the acous
he acous tic loc
tic locking
kingv
ver
er i/-
i/-
cation
cation signal
signal Multimedia system:
4 © 5
Settings 5
Vehicle #
Activate or deactivate Acoustic lock.
% Please observ
Please observ e:
e:
The selected setting forth e acoustic locking
ve ri/cation signal must comply with there le-
va nt national road and tra1c regulations. In
some countries, including German y,using the
acoustic locking veri/cation signal is forbid-
den bytra1c la ws(in accordance with §16
Pa ra. 1 and §30 Para. 1 of the German
national road tra1c regulations). The driver of
th eve hicle must comply with these regula-
tions. In countries where the use of this func-
tion is forbidden, this function is not activated
in theve hicle and must not be activated. Changing t
Changing t
he unloc
he unlocking se
king se ttings
ttings Po
ssible unlocking functions of theke y:
R Central unlocking
R Unlocking the driver's door and fuel /ller 0ap R
Plug-in h Plug-in h ybr ybrid:
id:unlocking the driver's door and
fuel /ller 0ap/soc ket0 ap #
T To switc o switc h be
h betw
tween se
een se ttings:
ttings: presstheÜ
and ß buttons simultaneously for appr ox-
imately six seconds until the indicator lamp
0ashes twice.
Options if the unlocking function forth e driver's
door and fuel /ller 0ap has been selected:
R T To unloc o unloc k t
k the v
he v ehicle centr
ehicle centr ally:
all y: press the
Ü button twice.
R V
Vehicles wit
ehicles wit h KEYLESS-GO:
h KEYLESS-GO: ifyo uto uch the
inner sur face of the door handle on the driv-
er's door, only the driver's door and the fuel
/ller 0ap are unloc ked.
Options if the unlocking function forth e driver's
door and fuel /ller 0ap/soc ket0 ap has been
selected (plug-in-hybrid):
R T
To unloc
o unloc k t
k the v
he v ehicle centr
ehicle centr ally:
all y: press the
Ü button twice.
R V
Vehicles wit
ehicles wit h KEYLESS-GO:
h KEYLESS-GO: ifyo uto uch the
inner sur face of the door handle on the driv-
er's door, only the driver's door and the fuel
/ller 0ap/soc ket0 ap are unloc ked. Deactiv
Deactiv
ating t
ating the function of t
he function of t hekey
he key V
V
ehicles wit
ehicles wit h KEYLESS-GO:
h KEYLESS-GO: ifyo u deactivate the
function of theke y,the KEYLESS-GO functions are
also deactivated. Access or drive authorization by
KEYLESS-GO is then no longer possible with that
particular key.Activate the function of theke y so
th at all its functions will again be available.
Yo u can also deactivate the function of theke yto
re duce the energy consum ption of theke y if you
do not use theve hicle or a keyfo r an extended
period of time. #
T
To deactiv
o deactiv at
ate:
e: press theß button on the
ke y twice in quick succession.
The key indicator lamp 0ashes twice brie0y
and lights up once. #
T
To activ
o activ at
ate:
e: press any but ton on thekey.
% When theve hicle is star ted with theke y in the
st ow age compartment of the centre console,
th e function of theke y is automatical lyactiva-
te d (/ page 166). Opening and closing
83
83

Doors
Doors
N
No
ot
tes on t
es on t he additional door lock
he additional door lock The additional door lock is only
available forve hi-
cles forth e United Kingdom. &
W
WARNING
ARNING Risk of injury topersons inside
th eve hicle when the additional door lock
is activated
If th e additional door lock is activated, the
doors can no longer be opened from the
inside. #
Never lea vepersons, in particular chil-
dren, unattended in theve hicle. #
Ifth ere are persons in theve hicle, do not
activate the additional door loc k.The additional door lock is automatically activated
in
thefo llowing situations:
R The vehicle is loc ked using thekey.
R The vehicle is loc ked using KEYLESS-GO. If
th eve hicle has been loc ked via Mercedes me
connect, the additional door lock is not activated
(/ page 315).
If th e additional door lock is activated, the doors
cannot be opened from the inside.
% ATer locking you can issue a signal with the
horn.
Yo u can pr event the additional door lock from
being activated bydeactivating interior pr otection
before locking theve hicle (/ page 101). U Unloc
nloc king/opening t
king/opening t he door
he doors fr
s from t
om t he inside
he inside #
U
Unitnit ed Kingdom only
ed Kingdom only :
: obser vethe no tes on
th e additional door lock (/ page 86). #
Pull door handle 1.86
86
Opening and closing

Centr
Centr
all
ally loc
y loc king and unloc
king and unloc king t
king the v
he vehicle fr
ehicle fr om
om
t
t he inside
he inside #
T
To unloc
o unloc k:
k:press button 1. #
T
To loc
o loc k:
k:press button 2.
The red indicator lamp on button 2lights up
once theve hicle is loc ked.
This does not lock or unlock the fuel /ller 0ap. Plug-in h
Plug-in h ybr
ybrid:
id:the soc ket 0ap is also loc ked and
unloc ked. The soc ket 0ap can be opened even if a
ke y is de tected in the car.
The vehicle is not unloc ked:
R ifyo u ha veloc kedth eve hicle using thekey
R ifyo u ha veloc kedth eve hicle using KEYLESS-
GO Loc
Loc
king/unloc
king/unloc king t
king the v
he v ehicle wit
ehicle wit h KEYLESS-GO
h KEYLESS-GO R
R
eq
eq uir
uir ements:
ements:
R The key is outside theve hicle.
R The dis tance between theke y and theve hicle
does not exceed 1 m.
R The driver's door and the door on which the
door handle is used are closed.
* NO
NOTE
TEVehicle damage due touninten-
tional opening of theta ilgate R
when using an automatic car wash
R when using a high pressure cleaner #
Deacti vate the function of theke y in
th ese situations.
or #
Make sure that theke y is at a minimum
dis tance of 3 m away from theve hicle. Obser
vethe no tes:
R onwashing theve hicle in a car wash
(/ page 337)
R on using a high pressure cleaner
(/ page 339) Opening and closing
87 87

#
T To unloc o unloc k t
k the v
he v ehicle:
ehicle: touch the inner sur face
of the door handle. #
T To loc o loc k t
k the v
he v ehicle:
ehicle: touch sensor sur face 1
or 2. #
Conv Conv enience closing:
enience closing: touch recessed sensor
sur face 2 until the closing process has been
comple ted. %
Further information on con venience closing
(/ page 94).
If yo u open theta ilgate from outside, it is auto-
matically unloc ked. Pr Pr
oblems wit
oblems wit h KEYLESS-GO, tr
h KEYLESS-GO, tr oubleshoo
oubleshooting
ting Y
Y
ou can no long
ou can no long er loc
er loc k or unloc
k or unloc k t
k the v
he v ehicle using
ehicle using
KEYLESS-GO
KEYLESS-GO
Po ssible causes:
R The function of theke y has been deactivated.
R The key battery is weak or dischar ged. #
Activate the function of theke y (/ page 83). #
Check the battery using the indicator lamp
(/ page 82). #
Replace theke y batter y,if necessary
(/ page 84). #
Use there placement key. #
Use the emer gency keyto lock or unlock
(/ page 89). #
Have theve hicle and keych ecked at a quali-
/ed specialist workshop. Ther Ther
e is int
e is int erf
erfer
erence fr
ence fr om a pow
om a pow er
erful r
ful r adio signal
adio signal
sour
sour ce
ce
Po ssible causes if the function of KEYLESS-GO is
impaired:
R high voltage po wer lines
R mobile phones
R electronic devices (no tebooks, tablets)
R shielding due tome tal objects or induction
loops for electrical gate systems or automatic
bar riers #
Make sure that there is su1cient distance
between theke y and the po tential sou rce of
inter fere nce. A
A
ctiv
ctiv ating/deactiv
ating/deactiv ating t
ating the aut
he automatic loc
omatic loc king f
king fea-
ea-
ture
ture The
vehicle is loc ked automatically when theve hi-
cle is switched on and the wheels are turning
fa ster than walking pace. 88
88
Opening and closing

R
when tow- awa y protection is triggered
(/ page 100)
The ATA system is primed automatically aTer
appr oximately ten seconds in thefo llowing situa-
tions:
R aTer locking theve hicle with thekey
R aTer locking theve hicle using KEYLESS-GO Indicator lamp
10ashes when theATA system is
primed.
The ATA system is deacti vated automatically in the
fo llowing situations:
R aTer unlocking theve hicle with thekey
R aTer unlocking theve hicle using KEYLESS-GO
R aTer pressing the start/s top button with the
ke y in the st owage compartment
(/ page 166)
% When the Mercedes‑Benz emer gency call sys-
te m is active and the alarm st ays on for more
th an 30 seconds, a message is automatically
sent tothe Customer Assistance Centre
(/ page 320).
Deactiv Deactiv ating t
ating theATA
he ATA #
Press theÜ orß button on thekey.
or #
Press the start/s top button with theke y in the
st ow age compartment (/ page 166)
Deactiv
Deactiv ating t
ating the alar
he alar m using KEYLESS-GO
m using KEYLESS-GO #
Grasp the outside door handle with thekey
outside theve hicle. F
F
unction of tow
unction of tow-awa
-a wa y pr ot
y pr otection
ection An audible and visual alarm is triggered if an alter-
ation
toyour vehicle's angle of inclination is
de tected while tow- awa y protection is primed.
To w- awa y protection is automatically primed aTer
appr oximately 60 seconds:
R aTer locking theve hicle with thekey
R aTer locking theve hicle using KEYLESS-GO
To w- awa y protection is only primed when thefo l-
lowing components are closed:
R doors
R tailgate
To w- awa y protection is automatically deactivated:
R aTer pressing theÜ button on thekey
R aTer pressing the start/s top button with the
ke y in the st owage compartment
(/ page 166)
R aTer unlocking theve hicle using KEYLESS-GO
Information on collision de tection on a par ked
ve hicle (/ page 218). 100 100
Opening and closing

Pr
Pr
iming/deactiv
iming/deactiv atingtow
ating tow-awa
-a wa y pr ot
y pr otection
ection Multimedia system:
4 © 5
Settings 5
Quick access #
Prime or deactivate Tow-away protection.
To w- awa y protection is primed again in thefo llo w-
ing cases:
R The vehicle is unloc ked again.
R A door is opened.
R The vehicle is loc ked again.
% Ifqu ick access is una vailable, select theVehi-
cle submenu in theSettings main menu to
prime or deactivate tow- awa y protection. F
F
unction of int
unction of int er
erior pr ot
ior pr otection
ection When interior pr
otection is primed, a visual and
audible alarm is triggered if mo vement is de tected
in theve hicle interior.
Interior pr otection is primed automatically aTer
appr oximately ten seconds:
R aTer locking theve hicle with thekey
R aTer locking theve hicle using KEYLESS-GO Interior pr
otection is only primed when thefo llo w-
ing components are closed:
R doors
R tailgate
Interior pr otection is automatically deactivated:
R aTer pressing theÜ button on thekey
R aTer pressing the start/s top button with the
ke y in the st owage compartment
(/ page 166)
R aTer unlocking theve hicle using KEYLESS-GO
The following situations can lead toafa lse alarm:
R when there are moving objects such as mas-
cots in theve hicle interior
R when a side wind owis open
R when a panoramic sliding sunroof is open Pr
Pr
iming/deactiv
iming/deactiv ating int
ating int er
erior pr ot
ior pr otection
ection Multimedia system:
4 © 5
Settings 5
Quick access #
Prime or deactivate Interior motion sensor .Interior pr
otection is primed again in thefo llowing
cases:
R The vehicle is unloc ked again.
R A door is opened.
R The vehicle is loc ked again.
% Ifqu ick access is una vailable, select theVehi-
cle menu under Settingstoprime or deacti-
va te interior pr otection. Opening and closing
101 101

Ins
Ins
tr
trument displa
ument displa y and on-boar
y and on-boar d com-
d com-
put
put er
er
Fu nction/no tes...................................... 277
Int
Int ellig
ellig ent Light Syst
ent Light Syst em
em
Ac tivating/deactivating.......................... 138
Ac tive headlamps................................... 137
Ad aptive Highbeam Assis t...................... 139
Ad aptive Highbeam Assist Plu s............... 140
City lighting............................................ 138
Cornering light....................................... 138
Mo torw ay mode.................................... .138
Overview................................................ 137
Int Int ellig
ellig ent oper
ent oper ating-mode s
ating-mode str trat
at egy
egy
see Route-based operating-mode strategy
Int
Int er
erior lighting
ior lighting
Ad justing............................................... 142
Ambient lighting.................................... .142
Re ading lamp......................................... 142
Switch-o. delay time.............................. 143
Int
Int er
erior pr ot
ior pr otection
ection
Fu nction................................................ 101
Priming/deactivating............................. 101
Int
Int er
erne
ne t r
t radio
adio
see TuneIn iPhone
iPhone
®
®
see Smartphone integ ration
ISOFIX c
ISOFIX c hild seat anc
hild seat anc hor
hor
Seats suitable for attaching...................... 68
ISOFIX c
ISOFIX c hild seat secur
hild seat secur ing syst
ing syst em
em
Fi tting...................................................... 70 J
J
Jack Jack Declaration of conformity......................... 36
Storage location.................................... .377
Jum Jum p-st
p-st ar
art connection
t connection
General no tes....................................... .355 K
K
K K e ey
y
Ac oustic locking veri/cation signal.......... .83
Ac tivating/deactivating pre-entry cli-
mate control.......................................... 156
Battery..................................................... 84
Deactivating a function............................ 83
Emer gency key......................................... 84
Energy consum ption................................ 83
Fu nction overview.................................... 82 Ke
yring attachment................................. 84
Problem................................................... 85
Unlocking setting..................................... 83
KEYLESS-GO KEYLESS-GO Deactivating a function............................ 83
Locking/unlocking theve hicle................. 87
Problem................................................... 88
Unlocking setting.................................... .83
Kic Kic kdo
kdo wn
wn
Using..................................................... 186
Knee airbag
Knee airbag.................................................... 53 L
L
Lamp
Lamp see Interior lighting
Lam
Lam p (ins
p (instr trument displa
ument displa y)
y)
see Warning/indicator lamp
Lane det
Lane det ection (aut
ection (aut omatic)
omatic)
see Active Lane Keeping Assist
Lane K
Lane K eeping Assist
eeping Assist
see Active Lane Keeping Assist
Language
Language Notes..................................................... 297 510
510
Index

Loads
Loads
Fixing..................................................... 116
Loc
Loc king/unloc
king/unloc king
king
Ad ditional door loc k................................. 86
Emer gency key......................................... 89
KEYLESS-GO............................................ 87
Opening theta ilgate................................. 90
Switching the automatic locking fea-
ture on/o.............................................. .88
Unlo cking/opening the doors from
th e inside................................................. 86
Lo
Lo w beam w beam
Ac tivating/deactivating.......................... 134
Light adjustment (driving abroad)........... 134
L
L ubr
ubr icant additiv
icant additiv es
es
see Additives
L
L ugg
ugg age
age
Securing................................................ 116
L
L umbar support
umbar support
see Lumbar support (4-w ay)
L
L umbar suppor
umbar suppor t (4-wa
t (4-way)
y)...............................1 08 M
M
Main beam
Main beam Changing bulbs...................................... 145
Maint
Maint enance
enance
see ASS YST PLUS
Malfunction Malfunction Restraint system..................................... .47
Manoeuvr Manoeuvr ing aid
ing aid
see Manoeuvring assistance
Manoeuvr
Manoeuvr ing assist
ing assistance
ance
Cross Tra1c Ale rt.................................. 270
Drive Away Assist................................... 269
Manoeuvr
Manoeuvr ing assist
ing assistant
ant
Ac tivating/deactivating.......................... 270
Manual tr
Manual tr ansmission
ansmission
Operating thege arshiT le ver.................. 181
Map
Map
Displaying online map contents.............. 305
Displaying weather informatio n.............. 305
Moving................................................... 304
Selecting the map orientation................ 304
Setting the map scale............................ 304 Switching mo
torw ay information
on/o.................................................... 304
Massag
Massag e pr
e progr
ogrammes
ammes
Re setting the settings............................ 110
Selecting the front seats........................1 10
Maximum design speed
Maximum design speed ................................ 178
Maximum design speed
Maximum design speed see Limiter
Maximum per
Maximum per missiblegr
missible gross v
oss v ehicle w
ehicle w eight
eight... 392
MBUX Int
MBUX Int er
erior Assist
ior Assist ant
ant
Overview................................................ 290
Switching there ading light on/o.
(contactless).......................................... 291
Switching the sear chlight on/o.
(contactless). ......................................... 291
MBUX multimedia syst MBUX multimedia syst em
em
Ac tivating/deactivating standby mode... 219
Collision de tection (par kedve hicle)........ 218
Con/guring drive prog ram I................... .180
Home screen......................................... 286
No tes..................................................... 285
Operating theto uchscreen..................... 287
Overview................................................ 285
Re storing (fac tory settings).................... 298 512 512
Index