2022 MERCEDES-BENZ A-CLASS HATCHBACK Owners Manual

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

Securing with the vehicle seat belt
W
eight category 0 (up to 10 kg and approximately
6 months) and weight category 0+ (up to 13 kg
and approximately 15 months) Type
1
BABY SAFE plus II
Approval E1 04 301 146
Order number 2
A 000 970 38 02
1 Manufacturer: Britax R

Approval categories for child restraint systems
Only use approved child restraint systems
Onl y 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)
*dentiNcation on the child restraint system
Information about the approval category, weight
category and approval number, forexample, is on
the approval label on the child restraint system.
There may be further information suchas the ISO-
FIX size categories, depending on the approval
category of the child restraint system. Approval categories in accordance with UN-R44
Example of an approval label
= U
niversal: child restraint systems in the "Uni-
versal" category are approved for installation
in vehicles. They can be used, in accordance
with overviews of the suitability of seats for
securing child restraint systems, on seats
labelled U, UF or IUF. The identiNcation
IUF r
efers to ISOFIX child
restraint systems in the "Universal" category.
These child restraint systems must also be
secured using Top Tether or support points.
= Semi-Universal: child restraint systems in the
"Semi-Universal" category may only be used if
the vehicle and vehicle seat are listed in the
child restraint system manufacturer's vehicle
model list.
= Vehicle-speciNc: child restraint systems in the
vehicle-speciNc category may only be used if
the vehicle and vehicle seat are listed in the
child restraint system manufacturer's vehicle
model list. Occupant safety
69