Get Children in the vehicle -> Securing the child restraint system Guide for Mercedes CLA 4 Door Third Generation (2025-2026)

WARNING Risk of injury or death caused

by incorrect positioning of the child

restraint system

If you secure a child in a forward-facing child

restraint system on the front passenger seat

and you position the front passenger seat too

close to the cockpit, in the event of an acci-

dent, the child could:

Come into contact with the vehicle interior

if the PASSENGER AIR BAG OFF indicator

lamp is lit, for example.

Be struck by the air bag if the PASSENGER

AIR BAG OFF indicator lamp is o.

Always move the front-passenger seat as

far back as possible. 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 accordingly.

Always comply with the child restraint

system manufacturer's installation

instructions.

Be sure to also observe the following further rela-

ted subjects:

Function of the automatic front passenger air

bag shuto (/ page 41)

Suitable child restraint systems for the transport

of children

Information on the benet of a rearward-facing

child restraint system

Transport a baby in a suitable rearward-facing

child restraint system only. It is also preferable to

transport a small child in a suitable rearward-

facing child restraint system. In this case, the

child sits in the opposite direction to the direction

of travel and faces backwards.

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.

Securing the child restraint system

Adjusting the seat correctly

When installing a child restraint system on the le

or right rear seat, always observe the following:

Make sure that the child's feet do not touch

the front seat. If necessary, move the front

seat slightly forwards.

If the head restraint of the child restraint system

cannot be fully extended when it is installed in the

vehicle, this will result in restrictions on the maxi-

mum size setting for certain child restraint sys-

tems. Observe the child restraint system manu-

facturer's installation instructions.

Contact with the roof when the head restraint

is fully extended and locked in place will not

result in any restrictions on use.

Children in the vehicle – Suitable child restraint systems for the transport of children

® When installing an ISOFIX/LATCH child

restraint system, also observe the following:

When using a rearward-facing child restraint

system on a rear seat: adjust the front seat so

that it does not touch the child restraint sys-

tem.

When using a forward-facing child restraint

system with integrated child seat belt: adjust

the head restraint of the respective seat so

that it does not push the child restraint system

forwards. If necessary, the respective head

restraint can be removed. In addition, the

backrest of the child restraint system must lie

as at as possible against the backrest of the

vehicle seat. Aer the child restraint system

has been removed, replace the vehicle head

restraint immediately and adjust correctly.

The child restraint system must not be put

under strain between the roof and seat cush-

ion and/or be installed facing the wrong direc-

tion. Where possible, adjust the seat cushion

inclination accordingly.

Adjust the vehicle head restraints so that the

child restraint system is not put under strain

by the head restraint.

7 When installing a belt-secured child

restraint system, also observe the following:

When using a rearward-facing child restraint

system on a rear seat: adjust the front seat so

that it does not touch the child restraint sys-

tem.

Also secure Top Tether if present

(/ page 63).

When using a forward-facing child restraint

system with integrated child seat belt: adjust

the head restraint of the respective seat so

that it does not push the child restraint system

forwards. If necessary, the respective head

restraint can be removed. In addition, the

backrest of the child restraint system must lie

as at as possible against the backrest of the

vehicle seat. Aer the child restraint system

has been removed, replace the vehicle head

restraint immediately and adjust correctly.

The backrest of the forward-facing child

restraint system must be resting as at as

possible on the seat backrest of the rear seat.

The child restraint system must not be put

under strain between the roof and seat cush-

ion and/or be installed facing the wrong direc-

tion. Where possible, adjust the seat cushion

inclination accordingly.

Adjust the vehicle head restraints so that the

child restraint system is not put under strain

by the head restraint.

Make sure that the child's feet do not touch

the front seat. If necessary, move the front

seat slightly forwards.

7 Depending on the vehicle equipment,

always observe the following when installing a

belt-secured child restraint system on the front

passenger seat:

Observe the notes on rearward- and forward-

facing child restraint systems on the front

passenger seat (/ page 57).

When using a forward-facing child restraint

system integrated child seat belt: remove the

Children in the vehicle – Securing the child restraint system

head restraint from the respective seat, if pos-

sible. Aer the child restraint system has been

removed, immediately replace the head

restraint and adjust correctly.

The backrest of the forward-facing child

restraint system must be resting as at as

possible on the seat backrest of the front

passenger seat.

The child restraint system must not be put

under strain between the roof and seat cush-

ion and/or be installed facing the wrong direc-

tion.

Adjust the vehicle head restraints so that the

child restraint system is not put under strain

by the head restraint.

Never place objects (e.g. cushions) under or

behind the child restraint system.

Set the front passenger seat as far back as

possible and move the seat into the highest

position if possible. Always make sure that the

shoulder belt strap is correctly routed from

the seat belt outlet of the vehicle to the shoul-

der belt guide on the child restraint system.

The shoulder belt strap must be routed for-

wards from the seat belt outlet and, where

possible, downwards to the child restraint sys-

tem.

Fully retract the seat cushion length adjust-

ment.

Adjust the seat cushion inclination so that the

front edge of the seat cushion is in the highest

position and the rear edge of the seat cushion

is in the lowest position.

Set the seat backrest to the most vertical

position possible.

Activating or deactivating the special seat belt

retractor of the seat belt

WARNING Risk of injury or death if a seat

belt is unfastened while the vehicle is in

motion

If the seat belt is released while the vehicle is

in motion, the special seat belt retractor is

deactivated and the child restraint system is

no longer correctly secured. The seat belt is

drawn in slightly by the inertia reel and cannot

be immediately closed again.

Stop the vehicle immediately in accord-

ance with the trac conditions.

Activate the special seat belt retractor

again and correctly secure the child

restraint system.

When enabled, the child seat safety feature

ensures that the seat belts of the front passenger

seat and rear seats do not slacken once the child

restraint system is secured.

The seat belts on the following seats are equipped

with a child seat safety feature:

Front passenger seat

Rear seats

Installing a child restraint system

When installing a child restraint system,

always observe the manufacturer's installation

and operating instructions as well as the infor-

mation in this Operator's Manual.

Children in the vehicle – Securing the child restraint system

Pull the seat belt smoothly from the seat belt

outlet.

Engage the seat belt tongue in the belt buckle.

Activating the special seat belt retractor:

Pull the seat belt out fully and let the inertia

reel retract it again.

When the special seat belt retractor is activa-

ted, you should hear a ratcheting sound.

Push the child restraint system down until the

seat belt sits tightly.

Deactivating the special seat belt retractor:

Press the release button of the seat belt

buckle.

Hold the seat belt tongue and guide back to

the seat belt outlet.

Installing an ISOFIX/LATCH child restraint system

WARNING Risk of accident if the rear

bench seat, rear seat and seat backrest

are not engaged

The rear bench seat, rear seat and seat back-

rest may fold forwards, even when you are

driving.

As a result, the vehicle occupant will be

pushed into the seat belt with increased

force. The seat belt will not be able to pro-

tect as intended and could cause addi-

tional injury.

Objects or loads in the trunk or cargo

compartment will not be restrained by the

seat backrest.

Make sure that the rear bench seat, the

rear seat and the seat backrest are

engaged before every trip.

If the rear seat backrest is not engaged and

locked in place, the red lock verication indicator

will be visible.

WARNING Risk of injury or death if the

permissible gross mass of the child and

child restraint system together is excee-

ded.

Too much load may be placed on the LATCH-

type (ISOFIX) or iSize child restraint systems

and the child may not be restrained correctly

in the event of an accident, for example.

If the child is secured in a LATCH-type

(ISOFIX) child restraint system with inte-

grated seat belt, the total mass of the

child and child restraint system must not

exceed 73 lb (33 kg).

Always comply with the information about the

mass of the child:

in the manufacturer's installation and operat-

ing instructions for the child restraint system

used

on a label on the child restraint system, if

available

Children in the vehicle – Securing the child restraint system

Regularly check that the permissible gross mass

of the child and child restraint system is still com-

plied with.

When you install a child restraint system, observe

the following:

Always observe the correct use and suitabil-

ity of the seats for attaching a child restraint

system.

LATCH-type (ISOFIX) securing rings

Before every journey, make sure that the ISO-

FIX/LATCH child restraint system has cor-

rectly engaged both securing rings in the vehi-

cle.

NOTE Damage to the seat belt for the cen-

ter seat during installation of the child

restraint system

Make sure that the seat belt is not trap-

ped.

Attach the ISOFIX/LATCH child restraint sys-

tem to both securing rings in the vehicle.

Fastening a Top Tether

WARNING Risk of injury or death if the

rear seat backrests are not locked aer

Top Tether belts are installed

The rear seat backrests may fold forwards

when you are driving.

As a result, child restraint systems will no lon-

ger be able to perform their intended protec-

tive function. This may also cause additional

injuries.

Always lock rear seat backrests aer

installing Top Tether belts.

Children in the vehicle – Securing the child restraint system

Observe the lock verication indicator.

If the rear seat backrest is not engaged and

locked in place, the red lock verication indicator

will be visible.

If the child restraint system is equipped

with a Top Tether belt:

The risk of injury may be reduced by Top

Tether. The Top Tether belt enables an

additional connection between the child

restraint system attached with ISOFIX (le

and right rear seats) or the seat belt (all

rear seats) and the vehicle.

Fold up cover 2 of Top Tether anchorage 3.

Vehicles with adjustable head restraints:

If necessary, slide head restraint 1 upwards

(/ page 100).

Guide Top Tether belt 4 under head restraint

1 between the two head restraint bars.

Vehicles without adjustable head restraints:

Top Tether belt with one seat belt strap: guide

Top Tether belt 4 past head restraint 1 on

the side nearest the door.

Top Tether belt with two seat belt straps: guide

one Top Tether belt 4 past head restraint 1

on the right and le sides respectively.

All vehicles:

Install the ISOFIX or belt-secured child

restraint system with Top Tether. In doing so,

comply with the child restraint system manu-

facturer's installation instructions.

Children in the vehicle – Securing the child restraint system

Hook Top Tether hook 5 of Top Tether belt

4 into Top Tether anchorage 3 without

twisting.

Tension Top Tether belt 4. In doing so, com-

ply with the child restraint system manufactur-

er's installation instructions.

Fold down cover 2 of Top Tether anchorage

Vehicles with adjustable head restraints:

If necessary, slide head restraint 1 down-

wards (/ page 100). Make sure that you do

not interfere with the correct routing of Top

Tether belt

Securing the child restraint system with the seat

belt

WARNING Risk of accident if the rear

bench seat, rear seat and seat backrest

are not engaged

The rear bench seat, rear seat and seat back-

rest may fold forwards, even when you are

driving.

As a result, the vehicle occupant will be

pushed into the seat belt with increased

force. The seat belt will not be able to pro-

tect as intended and could cause addi-

tional injury.

Objects or loads in the trunk or cargo

compartment will not be restrained by the

seat backrest.

Make sure that the rear bench seat, the

rear seat and the seat backrest are

engaged before every trip.

If the rear seat backrest is not engaged and

locked in place, the red lock verication indicator

will be visible.

The seat belts on the following seats are equipped

with a special seat belt retractor:

Front passenger seat

Rear seats

When enabled, the special seat belt retractor

ensures that the seat belts of the front passenger

seat and rear seats do not slacken once the child

restraint system is secured.

For a child restraint system in the "Universal"

or "Semi-Universal" category, make sure that

the system has been approved for the vehicle

seat.

Install the child restraint system.

The entire base of the child restraint system

must always rest on the sitting surface of the

seat.

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 for-

wards from the seat belt outlet and, where

Children in the vehicle – Securing the child restraint system

possible, downwards to the child restraint sys-

tem.

When installing on the rear seat: also secure

Top Tether if present.

When installing on the front passenger seat: if

necessary, adjust the seat belt outlet and the

front passenger seat accordingly.

Child safety locks

Activating or deactivating the child safety lock for

the rear doors

WARNING Risk of accident and injury if

children are le unattended in the vehicle

If children are le unattended in the vehicle,

they could in particular:

open doors, thereby endangering other

persons or road users.

get out and be struck by oncoming trac.

operate vehicle equipment and become

trapped, for example.

In addition, the children could also set the

vehicle in motion, for example by:

releasing the parking brake.

changing gear.

starting the vehicle.

Never leave children unattended in the

vehicle.

When leaving the vehicle, always take the

SmartKey with you and lock the vehicle.

Keep the SmartKey out of the reach of

children.

WARNING Risk of fatal injury due to expo-

sure to extreme heat or cold in the vehicle

If persons, particularly children, are subjected

to prolonged exposure to intense heat or cold,

there is a risk of severe injury or even death.

Never leave persons, particularly chil-

dren, unattended in the vehicle.

WARNING Risk of accident and injury due

to children le unattended in the vehicle

If children are traveling in the vehicle, they

could, in particular:

Open doors, thereby endangering other

persons or road users.

Get out and be struck by oncoming trac.

Operate vehicle equipment and become

trapped, for example.

Always activate the installed child safety

locks if children are traveling in the vehi-

cle.

Never leave children unattended in the

vehicle.

When leaving the vehicle, always take the

SmartKey with you and lock the vehicle.

There are child safety locks for the rear doors and

the rear side windows.

The child safety lock on the rear doors secures

each door separately. The doors can no longer be

opened from the inside.

Children in the vehicle

Children in the vehicle -> Securing the child restraint system for Your Mercedes CLA 4 Door Third Generation (2025-2026)

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