MERCEDES-BENZ A-CLASS HATCHBACK 2022 Repair Manual

&
WARNING Risk of injur y due to malfunc-
tioning sensors in the door
The function of the airbags can be impaired
due t
o modiNcations or incorrect work per-
formed on the doors or door trim, or if the
doors are damaged. 
Never modify the doors or parts of the
door

s. 
Always have work on the doors or door
tr

im carried out at a qualiNed specialist
workshop. &
WARNING Risk of injur
y due to deployed
airbag
A deployed airbag no longer oMer
s any protec-
tion. 
Have the vehicle towed to a q
ualiNed
specialist workshop in order to have the
deployed airbag replaced. Have deployed airbags replaced immediately. Status of the front passenger front airbag
Function of the automatic front passenger airbag
shut

oM
The automatic front passenger airbag shutoM is
able to detect whether the front passenger seat is
occupied by a person or a child restraint system.
The front passenger airbag is enabled or disabled
accordingly. &
WARNING Risk of injur
y or death due to
objects under the co-driver seat
Objects trapped under the co-driver seat can
int
erfere with the function of the automatic
co-driver airbag shutoM or damage the system. 
Do not store any objects under the co-
dr
iver seat. 
When the co-driver seat is occupied,
mak
e sure that no objects are trapped
under the co-driver seat. When Ntting
a c
hild restraint system to the front
passenger seat, observe the vehicle-speciNc infor-
mation (  page 80). Also, always observe the
notes on rearward-facing or forward-facing child restraint systems on the front passenger seat
(
 pag

e 79).
A person on the front passenger seat must
observe the following information:
= Fasten seat belts correctly ( page 50).
= Sit in an almost upright seat position with their
back against the seat backrest.
= Sit with their feet resting on the Ooor, if possi-
ble.
The front passenger airbag may otherwise be dis-
abled by mistake, for example, in the following sit-
uations:
= The front passenger transfers their weight by
supporting themselves on a vehicle armrest.
= The front passenger sits in such a way that
their weight is raised from the seat surface. &
WARNING Risk of injur
y or death due to a
disabled front passenger airbag
The front passenger airbag is disabled when
t
he PASSENGER AIR BAG OFF indicator lamp
is lit. 58
Occupant safety

A person in the front passenger seat could
t
hen, for example, come into contact with the
vehicle interior, especially if the person is sit-
ting too close to the cockpit.
If the front passenger seat is occupied, always
ensure that:
= the classiNcation of the person in the front
passenger seat is correct and the front
passenger airbag is enabled or disabled in
accordance with the person in the front
passenger seat.
= the front passenger seat has been moved
as far back as possible.
= the person is seated correctly. 
Both before and during the journey,
ensur

e that the status of the front
passenger airbag is correct. If the front passenger seat is occupied, the classi-
Ncation
of t

he person or child restraint system on
the front passenger seat takes place aser the
front passenger airbag shutoM self-test. The
PASSENGER AIR BAG indicator lamps display the
status of the front passenger airbag. Always observe the notes on the function of the
P
ASSENGER AIR BAG indicator lamps
(  page 59).
Function of the PASSENGER AIR BAG indicator
lamps Vehicles without automatic front passenger airbag
shut

oM have a special sticker aPxed to the side ofthe cockpit on the front passenger side
(
 pag

e 78).
Self-test of automatic front passenger airbag shut-
oM When the vehicle is switched on, a self-test is per-
formed during which the two PASSENGER AIR
BAG ON and OFF indicator lamps light up simulta-
neously.
The status of the front passenger airbag is dis-
played via the PASSENGER AIR BAG indicator
lamps aser the self-test:
= ON is lit: the front passenger airbag may
deploy during an accident.
The indicator lamp goes out aser 60 seconds.
= ON and OFF are not lit: the front passenger
airbag may deploy during an accident.
= OFF is lit: the front passenger airbag is disa-
bled. It will then not be deployed in the event
of an accident.
If the PASSENGER AIR BAG ON indicator lamp is
oM, only the PASSENGER AIR BAG OFF indicator
lamp shows the status of the front passenger air- Occupant safety
59

bag. The PASSENGER AIR BAG OFF indicator lamp
ma
y be lit continuously or be oM.
If the PASSENGER AIR BAG OFF indicator lamp
and the 6 restraint system warning lamp light
up simultaneously, the front passenger seat may
not be used. Also in this case, do not Nt a child
restraint system to the front passenger seat. Have
the automatic front passenger airbag shutoM
checked and repaired immediately at a qualiNed
specialist workshop.
Status display
If the front passenger seat is occupied, ensure,
both before and during the journey, that the sta-
tus of the front passenger airbag is correct for the
current situation.
Aser Ntting a rearward-facing child restraint sys-
tem to the front passenger seat: PASSENGER AIR
BAG OFF must be lit continuously. &
WARNING Risk of injur y or death when
using a rearward-facing child restraint sys-
tem while the front passenger airbag is
enabled
If you secure a child in a rearward-facing child
r
estraint system on the front passenger seat
and the PASSENGER AIR BAG OFF indicator
lamp is oM, the front passenger airbag can
deploy in the event of an accident.
The child could be struck by the airbag. 
Always ensure that the front passenger
airbag is disabled. The P

ASSENGER AIR
BAG OFF indicator lamp must be lit. 
NEVER use a rearward-facing child
r
estraint system on a seat with an ENA-
BLED FRONT AIRBAG. This can result in
the DEATH of or SERIOUS INJURY to the
CHILD. When Ntting
a c
hild restraint system to the front
passenger seat, observe the vehicle-speciNc infor-
mation (  page 79).
Depending on the child restraint system and the
stature of the child, the PASSENGER AIR BAG OFF indicator lamp may be
oM. In t
his case, do not Nt
the rearward-facing child restraint system to the
front passenger seat.
Instead, Nt the rearward-facing child restraint sys-
tem to a suitable rear seat.
Aser Ntting a forward-facing child restraint sys-
tem to the front passenger seat: depending on the
child restraint system and the stature of the child,
PASSENGER AIR BAG OFF may be lit continuously
or be oM. Always observe the following informa-
tion. &
WARNING Risk of injur
y or death due to
incorrect positioning of the forward-facing
child restraint system
If you secure a child in a forward-facing child
r
estraint system on the front passenger seat
that is positioned too close to the cockpit, in
the event of an accident, the child could:
= come into contact with parts of the vehi-
cle's interior if the PASSENGER AIR BAG
OFF indicator lamp is lit, for example
= be struck by the airbag if the PASSENGER
AIR BAG OFF indicator lamp is oM60
Occupant safety


Always move the front passenger seat as
f
ar back as possible and fully retract the
seat cushion length adjustment. While
doing so, always make sure that the
shoulder belt strap is correctly routed
from the seat belt outlet of the vehicle to
the shoulder belt guide on the child
restraint system. The shoulder belt strap
must be routed forwards and downwards
from the seat belt outlet. If necessary,
adjust the front passenger seat accord-
ingly. 
Always comply with the child restraint
sy

stem manufacturer's installation
instructions. When Ntting
a c
hild restraint system to the front
passenger seat, observe the vehicle-speciNc infor-
mation (  page 79).
If a person is sitting on the front passenger seat:
PASSENGER AIR BAG OFF may be lit continuously
or be oM, depending on the person's stature. A person on the front passenger seat must always
obser
ve the following information:
= If the front passenger seat is occupied by an
adult or a person with a stature corresponding
to that of an adult, the PASSENGER AIR BAG
OFF indicator lamp must be oM. This indicates
that the front passenger airbag is enabled.
If the PASSENGER AIR BAG OFF indicator
lamp is lit continuously, an adult or person
with a build corresponding to that of an adult
must not use the front passenger seat.
Instead, they should use a rear seat.
= If the front passenger seat is occupied by a
person of smaller stature (e.g. a teenager or
small adult), the PASSENGER AIR BAG OFF
indicator lamp is either lit continuously or
remains oM, depending on the classiNcation.
- If the PASSENGER AIR BAG OFF indicator
lamp is oM: move the front passenger seat
as far back as possible, or the person of
smaller stature should use a rear seat.
- If the PASSENGER AIR BAG OFF indicator
lamp is lit continuously: the person of smaller stature should not use the front
passeng
er seat. &
WARNING Risk of injur
y or death when
the PASSENGER AIR BAG OFF indicator
lamp is lit
If the PASSENGER AIR BAG OFF indicator
lam
p remains lit aser the self-test, the front
passenger airbag is disabled.
If the front passenger seat is occupied, always
ensure that:
= The classiNcation of the person in the front
passenger seat is correct and the front
passenger airbag is enabled or disabled in
accordance with the person in the front
passenger seat.
= The person is seated properly with a cor-
rectly fastened seat belt.
= The front passenger seat has been moved
as far back as possible. Occupant safety
61

Be sure to also observe the following further rela-
t ed subjects:
= Child restraint system on the front passenger
seat (  page 79)
= Suitable positioning of the child restraint sys-
tem ( page 68) PRE-SAFE
n
sy
stemFunction of PRE-SAFE
n
(anticipat
ory occupant
protection) PRE-SAFE
n
is able t
o detect certain critical driv-
ing situations and implement pre-emptive meas-
ures to protect the vehicle occupants.
PRE-SAFE n
can implement the following meas-
ures independently of each other:
= Tightening the seat belts on the driver's seat
and front passenger seat.
= Closing the side windows.
= Vehicles with sliding sunroof: closing the slid-
ing sunroof. =
V
ehicles with memory function: moving the
front passenger seat to a more favourable seat
position.
= PRE-SAFE n
Sound: provided that the multime-
dia system is switched on, generating a brief
noise signal to stimulate the innate protective
mechanism of a person's hearing.
* NOTE Damag
e caused by objects in the
footwell or behind the seat The automatic adjustment of the seat position
ma
y result in damage to the seat and/or the
object. 
Stow objects in a suitable place. Reversing the PRE-SAFE
n
sy
stem measures If an accident did not occur, the pre-emptive
measur

es that were taken are reversed.
You will need to perform certain settings yourself. 
If the seat belt pre-tensioning is not reduced,
mo
ve the seat backrest back slightly.
The locking mechanism releases. Function of PRE-SAFE
n
PL
US (anticipatory occu-
pant protection plus) PRE-SAFE
n
PL
US can detect certain impacts, par-
ticularly an imminent rear impact, and take pre-
emptive measures to protect the vehicle occu-
pants. These measures cannot necessarily pre-
vent an imminent impact.
PRE-SAFE n
PLUS can implement the following
measures independently of each other:
= Tightening the seat belts on the driver's seat
and front passenger seat.
= Activating the rear hazard warning lights at a
higher Oashing frequency.
= Increasing brake pressure when the vehicle is
stationary. This brake application is cancelled
automatically when the vehicle pulls away.
If an accident did not occur, the pre-emptive
measures that were taken are reversed.
System limits
The system will not initiate any action in the fol-
lowing situations:
= when reversing 62
Occupant safety

or
= when t
he vehicle is towing a trailer and there
is a risk of a rear impact
The system will not initiate any braking application
in the following situations:
= whilst driving
or
= when entering or exiting a parking space while
using Active Parking Assist Automatic measures
aser an accident
Depending on t
he type and severity of the acci-
dent, and depending on the vehicle's equipment,
the following measures can be implemented, for
example:
= automatic braking (post-collision brake)
= activating the hazard warning lights
= triggering an automatic emergency call
( page 325)
= switching oM the engine To start the vehicle again, switch the vehicle
oM and on once mor

e ( page 168). Depend-
ing on the type and severity of the accident,
you may no longer be able to start the vehicle.
= switching oM the fuel supply
= vehicles with hybrid drive: switching oM the
hybrid system and high-voltage on-board elec-
trical system
= unlocking the vehicle doors
= lowering the side windows
= displaying the emergency guide in the multi-
media system display
= switching on the interior lighting
Function of the post-collision brake
Depending on the accident situation, the post-col-
lision brake can minimise the severity of a further
collision or even avoid it.
If an accident is detected, the post-collision brake
can implement automatic braking. When the vehi-
cle has come to a standstill, the electric parking
brake is automatically applied. The driver can cancel automatic braking by taking
t
he following actions:
= braking more strongly than automatic braking
= fully depressing the accelerator pedal with
force Safely transporting children in the vehicle
Always observe when children are travelling in the
v
ehicle %
Also strictly observe the safety notes for the
speciNc situation. In t

his way you can recog-
nise potential risks and avoid dangers if chil-
dren are travelling in the vehicle
(  page 64).
Be diligent
Bear in mind t
hat negligence when securing a
child in the child restraint system may have seri-
ous consequences. Always be diligent in securing
a child carefully before every journey.
Never allow babies and children to travel sitting
on the lap of another vehicle occupant. Occupant safety
63

To improve protection for children younger than
12 y ears old or under 1.50 m in height,
Mercedes-Benz recommends you observe the fol-
lowing information:
= Always secure the child in a child restraint sys-
tem suitable for this Mercedes-Benz vehicle.
= The child restraint system must be appropriate
to the age, weight and size of the child.
= The vehicle seat must be suitable for Ntting a
child restraint system (  page 68).
Accident statistics show that children secured on
the rear seats are generally safer than children
secured on the front seats. For this reason,
Mercedes-Benz strongly advises that you Nt a
child restraint system to a rear seat.
The generic term child restraint system
The generic term child restraint system is used in
this Owner's Manual. A child restraint system is,
for example:
= a baby car seat
= a rearward-facing child seat
= a forward-facing child seat =
a c hild booster seat with a backrest and seat
belt guide
Mercedes-Benz recommends using a child
booster seat with a backrest.
The child restraint system must be appropriate to
the age, weight and size of the child.
Observe laws and legal requirements
Always observe the legal requirements when
using a child restraint system in the vehicle.
Make sure that the child restraint system is
approved in accordance with the valid test speciN-
cations and guidelines. Further information can
be obtained at a qualiNed specialist workshop.
Mercedes-Benz recommends that you use a
Mercedes-Benz Service Centre for this purpose.
Only use approved child restraint systems
Only child restraint systems that meet the follow-
ing UNECE standards are permitted for use in the
vehicle:
= UN-R44
= UN-R129 (i-Size child restraint systems) Information on child restraint system approval
cat
egories and details on the approval label on
the child restraint system (  page 69). Detecting risks, avoiding danger
Securing systems for child restraint systems in
t
he vehicle
Only use the following securing systems for child
restraint systems: = the ISOFIX or i-Size securing rings
= the vehicle's seat belt system
= the Top Tether anchorages
Fitting an ISOFIX or an i-Size child restraint sys-
tem is preferred.
Simply attaching to the securing rings on the vehi-
cle can reduce the risk of Ntting the child restraint
system incorrectly.
When securing a child with the integrated seat
belt of the ISOFIX or i-Size child restraint system,
always comply with the permissible gross weight
for the child and child restraint system
(  page 72). 64
Occupant safety

Advantage of a rearward-facing child restraint sys-
t
em
It is preferable to transport a baby or a small child
in a suitable rearward-facing child restraint sys-
tem. In this case, the child sits in the opposite
direction to the direction of travel and faces back-
wards.
Babies and small children have comparatively
weak neck muscles in relation to the size and
weight of their head. The risk of injury to the cer-
vical spine during an accident can be reduced in a
rearward-facing child restraint system.
Always secure a child restraint system correctly &
WARNING Risk of injur
y or death due to
incorrect installation of the child restraint
system
The child can then not be protected or
r
estrained as intended. 
Be sure to comply with the manufactur-
er's ins
tallation instructions for the child
restraint system and its correct use. 
Make sure that the entire base of the
c
hild restraint system always rests on
the sitting surface of the seat. 
Never place objects (e.g. cushions)
under or behind t

he child restraint sys-
tem. 
Use child restraint systems only with the
or

iginal cover designed for them. 
Always replace damaged covers with
g

enuine covers. &
WARNING Risk of injur
y or death due to
unsecured child restraint systems in the
vehicle
If the child restraint system is incorrectly Ntt
ed
or not secured, it can become detached.
The child cannot then be protected or
restrained as intended.
The unused child restraint system can be
become detached and strike vehicle occu-
pants. 
Always comply with the manufacturer's
ins
tallation instructions for the child
restraint system and its correct use. 
Always Nt c
hild restraint systems cor-
rectly, even if they are transported
unused in the vehicle. =
Alw
ays observe the child restraint system
manufacturer's installation and operating
instructions as well as the vehicle-speciNc
information:
- Fitting the ISOFIX or i-Size child restraint
system to the rear seat ( page 72).
- Securing the child restraint system with
the seat belt on the rear seat
( page 77).
- Securing the child restraint system with
the seat belt on the front passenger seat
(  page 80). Observe the speciNc
instructions for the rearward-facing and
forward-facing child restraint systems
(  page 79).
If the front passenger seat is occupied,
ensure, both before and during the jour- Occupant safety
65

ney, that the status of the front passenger
airbag is cor rect for the current situation
( page 59).
= Observe the warning labels in the vehicle inte-
rior and on the child restraint system.
= Also secure Top Tether if present.
Do not modify the child restraint system &
WARNING Risk of injur
y due to modiNca-
tions to the child restraint system
The child restraint system can no longer func-
tion pr
operly. This poses an increased risk of
injury. 
Never modify a child restraint system. 
Only aPx accessor
ies which have been
specially approved for this child restraint
system by the child restraint system's
manufacturer. Mercedes!

Observe when stopping or parking
&
WARNING Risk of accident and injur y due
to leaving children unattended in the vehi-
cle
If children are les unatt
ended in the vehicle,
they could, in particular:
= open doors, thereby endangering other
persons or road users.
= get out and be struck by oncoming traPc.
= operate vehicle equipment and become
trapped, for example.
In addition, the children could also set the
vehicle in motion by, for example:
= releasing the parking brake.
= changing the transmission position.
= starting the vehicle. 
Never leave children unattended in the
v
ehicle. 
When leaving the vehicle, always take the
k
ey with you and lock the vehicle. 
Keep the vehicle key out of the reach of
c
hildren. &
WARNING Risk of f
atal injury due to expo-
sure to extreme heat or cold in the vehicle
If persons, particularly children, are subjected
t
o prolonged exposure to intense heat or cold,
there is a risk of severe injury or even death. 
Never leave persons, particularly chil-
dr
en, unattended in the vehicle. Overview of recommended child restraint systems
%
Further information on the correct child
r

estraint system can be obtained at a quali-
Ned specialist workshop. Mercedes-Benz rec-
ommends that you use a Mercedes-Benz
Service Centre for this purpose. Securing with ISOFIX
W

eight category 0+ (up to 13 kg and up to
approx. 15 months) Type
1
BABY SAFE plus
Size category E
Approval E1 04 301 146
Order number 2
B6 6 86 8224
1 Manufacturer: Britax R