2022 MERCEDES-BENZ A-CLASS SALOON Owners Manual

Mercedes-Benz recommends that you have the
batt
ery replaced at a qualiNed specialist work-
shop. 
Remove the emergency key (  pag
e 85).
Press release knob 2 do
wn fully and slide
cover 1 in the direction of the arrow. 
Fold out cover 1 in t
he direction of the arrow
and remove. 
Remove battery compartment 3 and t
ake
out the discharged battery. 
Insert the new battery into battery compart-
ment 3. Obser

ve the positive pole marking in the battery compartment and on the battery
when doing t

his. 
Push in battery compartment 3. 
Re-attach cover 1 and push it until it
eng
ages. Problems with the key, troubleshooting
You can no longer lock or unlock the vehicle
P
ossible causes:
= The key battery is weak or discharged. 
Check the battery using the indicator lamp
( pag

e 83). 
Replace the key battery, if necessary
( pag
e 85). 
Use the replacement key. 
Use the emergency key to lock or unlock
( pag

e 90). 
Have the key checked at a q
ualiNed specialist
workshop. There is interference from a powerful radio signal
sour
ce
Possible causes if the function of the key is
impaired:
= high voltage power lines
= mobile phones
= electronic devices (notebooks, tablets)
= shielding due to metal objects or induction
loops for electrical gate systems or automatic
barriers 
Make sure that there is suPcient dis
tance
between the key and the potential source of
interference.
You have lost a key 
Have the key deactivated at a q
ualiNed spe-
cialist workshop. 
If necessary, have the mechanical lock
r
eplaced as well. 86
Opening and closing

Doors
Notes on the additional door lock
The additional door lock is only available for vehi-
cles f or the United Kingdom. &
WARNING Risk of injur
y to persons inside
the vehicle when the additional door lock
is activated
If the additional door lock is activated, the
door
s can no longer be opened from the
inside. 
Never leave persons, in particular chil-
dr

en, unattended in the vehicle. 
If there are persons in the vehicle, do not
activ
ate the additional door lock. The additional door lock is automatically activated
in t

he following situations:
= The vehicle is locked using the key.
= The vehicle is locked using KEYLESS-GO. If the vehicle has been locked via Mercedes me
connect, t
he additional door lock is not activated
(  page 313).
If the additional door lock is activated, the doors
cannot be opened from the inside.
% Aser loc
king you can issue a signal with the
horn.
You can prevent the additional door lock from
being activ
ated by deactivating interior protection
before locking the vehicle ( page 104). Unlocking/opening the doors from the inside

United Kingdom only: obser
ve the notes on
the additional door lock ( page 87). 
Pull door handle 1. Opening and closing
87

Centrally locking and unlocking the vehicle from
t he inside 
To unlock: pr
ess 1 button. 
To lock: pr
ess button 2.
The red indicator lamp on button 2 lights up
once the vehicle is locked.
This does not lock or unlock the fuel Nller Oap.Plug-in hybrid: t

he socket Oap is also locked and
unlocked. The socket Oap can be opened even if a
key is detected in the car.
The vehicle is not unlocked:
= if you have locked the vehicle using the key
= if you have locked the vehicle using KEYLESS-
GO Locking/unlocking the vehicle with KEYLESS-GO
Requirements:
= The k

ey is outside the vehicle.
= The distance between the key and the vehicle
does not exceed 1 m.
= The driver's door and the door on which the
door handle is used are closed.
* NOTE Damag
e to the vehicle caused by
unintentionally opening the boot lid =
when using an aut
omatic car wash
= when using a high pressure cleaner 
Deactivate the function of the key in
t

hese situations.
or 
Make sure that the key is at a minimum
dis

tance of 3 m away from the vehicle. Observe the notes:
= on w

ashing the vehicle in a car wash
(  page 337)
= on using a high pressure cleaner
( page 339) 88
Opening and closing


To unlock the vehicle: t ouch the inner surface
of the door handle. 
To lock the vehicle: t
ouch sensor surface 1
or 2. 
Convenience closing: t
ouch recessed sensor
surface 2 until the closing process has been
completed. %
Further information on convenience closing
(  pag

e 97).
If you open the boot lid from outside, the boot lid
is aut
omatically unlocked. Problems with KEYLESS-GO, troubleshooting
You can no longer lock or unlock the vehicle using
KEYLESS-GO
P

ossible causes:
= The function of the key has been deactivated.
= The key battery is weak or discharged. 
Activate the function of the key ( pag
e 84). 
Check the battery using the indicator lamp
( pag

e 83). 
Replace the key battery, if necessary
( pag
e 85). 
Use the replacement key. 
Use the emergency key to lock or unlock
( pag

e 90). 
Have the vehicle and key checked at a quali-
Ned specialis

t workshop. There is interference from a powerful radio signal
sour

ce
Possible causes if the function of KEYLESS-GO is
impaired:
= high voltage power lines
= mobile phones
= electronic devices (notebooks, tablets)
= shielding due to metal objects or induction
loops for electrical gate systems or automatic
barriers 
Make sure that there is suPcient dis
tance
between the key and the potential source of
interference. Activating/deactivating the automatic locking fea-
tur
e The vehicle is locked automatically when the vehi-
cle is switc

hed on and the wheels are turning
faster than walking pace. Opening and closing
89


To activate: pr ess and hold button 2 for
approximately Nve seconds until an acoustic
signal sounds. 
To deactivate: pr
ess and hold button 1 for
approximately Nve seconds until an acoustic
signal sounds.
The red indicator lamp on button 2 lights up
once t
he vehicle is locked. In the following situations, there is a danger of
being loc

ked out when the function is activated:
= while the vehicle is being tow-started or
pushed
= if the vehicle is being tested on a roller dyna-
mometer Locking/unlocking the vehicle with the emer-
g

ency key Locking/unlocking the driver's door with the
emer

gency key
% If you wish to lock the vehicle entirely using
t
he emergency key, Nrst press the button for
locking from the inside while the driver's door
is open. Then proceed to lock the driver's
door using the emergency key. 
Remove the emergency key (  pag
e 85). 
Insert the emergency key as far as it will go
int
o opening 1 in the cover. 
Pull and hold the door handle. 
Pull the cover on the emergency key as
s

traight as possible away from the vehicle until
it releases. 
Release the door handle. 90
Opening and closing


To unlock: tur n the emergency key anti-clock-
wise to position 1. 
To lock: tur
n the emergency key clockwise to
position 1. 
Carefully press the cover onto the lock cylin-
der until it eng

ages and is seated Nrmly.Locking the front passenger door and rear doors

Insert a suitable object, e.g. the emergency
k
ey, into opening 1 on the door lock. 
To lock the les-hand side of t
he vehicle: turn
the emergency key anti-clockwise as far as it
will go. 
To lock the right-hand side of the vehicle: tur
n
the emergency key clockwise as far as it will
go.
If the locked door is then closed, it can no longer
be opened fr
om the outside. Boot
Opening the boot lid
&
DANGER Risk of e
xhaust gas poisoning
Combustion engines emit poisonous exhaust
g
ases such as carbon monoxide. Exhaust
gases can enter the vehicle interior if the boot
lid is open when the engine is running, espe-
cially if the vehicle is in motion. 
Always switch oM t
he engine before
opening the boot lid. 
Never drive with the boot lid open. Opening and closing
91

*
NOTE Damag e to the boot lid by obstacles
above the vehicle The boot lid swings upwards when it is
opened.

Therefore, make sure that there is suP-
cient clear

ance above the boot lid. 
Pull the boot lid handle. 
Vehicles with HANDS-FREE ACCESS: mak
e a
kicking movement with your foot below the
bumper ( page 93). 
Pull remote operating switch 1 until t
he boot
lid opens.
or 
Press and hold the

Note that the boot lid will not be locked if the fol-
lo wing situation occurs:
= You have locked the vehicle and close the
boot lid while a key belonging to the vehicle is
inside the vehicle.
and
= A second key belonging to the vehicle is not
detected outside the vehicle.
Automatic key recognition is only an aid and is not
a substitute for your attentiveness. 
Before locking, ensure that at least one key
belonging t

o the vehicle is outside the vehicle. 
To close the boot lid: pull t
he boot lid down-
wards using the handle recess and push it
closed. HANDS-FREE ACCESS function
With HANDS-FREE ACCESS you can open the
boo

t lid by performing a kicking movement under
the bumper.
Observe the notes when opening the boot lid
(  page 91). &
WARNING Risk of bur
ns caused by a hot
exhaust system
The vehicle exhaust system can become very
ho
t. If you use HANDS-FREE ACCESS, you
could burn yourself by touching the exhaust
system. 
Always ensure that you only make a kick-
ing mo

vement within the detection range
of the sensors. *
NOTE Damag
e to the vehicle caused by
unintentionally opening the boot lid =
when using an aut
omatic car wash
= when using a high pressure cleaner 
Deactivate the function of the key in
t

hese situations.
or 
Make sure that the key is at a minimum
dis

tance of 3 m away from the vehicle. Opening and closing
93