Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual: Securing the child restraint system with the seat belt

Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual / Occupant safety / Safely transporting children in the vehicle / Securing the child restraint system with the seat belt

Securing the child restraint system with the seat belt on the rear seat

WARNING Risk of injury if the rear bench seat/rear seat and seat backrest are not engaged

If the rear bench seat/rear seat and seat backrest are not engaged they could fold forwards, e.g. when braking suddenly or in the event of an accident.

If this is the case, the vehicle occupant would be forced into the seat belt by the rear bench seat/rear seat or by the seat backrest. The seat belt cannot protect as intended and could result in additional injury.

Objects or loads in the trunk/cargo compartment cannot be restrained by the seat backrest.

Make sure that the seat backrest and the rear bench seat/rear seat are engaged before every trip.

If the rear seat backrest is not engaged and locked, the red lock verification indicator will be visible.

When installing a belt-secured child restraint system, observe the following:

Always comply with the manufacturer's installation and operating instructions for the child restraint system used.
When using a category 0/0+ baby car seat and a category I rearward-facing child restraint system on a rear seat: adjust the front seat so that the seat does not touch the child restraint system.
When using a category I forward-facing child restraint system: remove the head restraint from the respective seat, if possible.
After removing the child restraint system, replace the head restraints again immediately and adjust them correctly.
The backrest of the forward-facing child restraint system must, as far as possible, be resting on the seat backrest of the rear seat.
For certain child restraint systems in weight category II or III, there may be restrictions in the maximum size setting, e.g. due to possible contact with the roof.
The child restraint system must not be put under strain between the roof and the seat cushion and/or be installed facing the wrong direction. Where possible, adjust the seat cushion inclination accordingly.
The child restraint system must not be put under strain by the head restraints. Adjust the head restraints accordingly.
Make sure that the child's feet do not touch the front seat. If necessary, move the front seat forward slightly.

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.

Install the child restraint system.
The entire base of the child restraint system must always rest on the sitting surface of the rear 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 forwards and downwards from the seat belt outlet.

Notes on rearward-facing and forward-facing child restraint systems on the front passenger seat

WARNING Risk of injury or death from using a rearward-facing child restraint system when the front passenger front airbag is enabled

If you secure a child in a rearward-facing child restraint system on the front passenger seat and the PASSENGER AIR BAG OFF indicator lamp is off, 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 deactivated. The PASSENGER AIR BAG OFF indicator lamp must be lit.

NEVER use a rearward-facing child restraint system on a seat protected by an ENABLED FRONT AIRBAG in front of it, DEATH or SERIOUS INJURY to the CHILD can occur.

Observe the specific instructions for the rearward- facing and forward-facing child restraint systems.

Warning notice on the front passenger sun visor Always observe the status of the front passenger front airbag on the PASSENGER AIR BAG OFF indicator lamp:

When using a rearward-facing child restraint system on the front passenger seat, the front passenger front airbag must always be disabled.
This is only the case if the PASSENGER AIR BAG OFF indicator lamp is lit continuously.
If the PASSENGER AIR BAG OFF indicator lamp is off, the front passenger front airbag is enabled. The front passenger front airbag may deploy during an accident.

Securing the child restraint system with the seat belt on the front passenger seat

When installing a belt-secured child restraint system on the front passenger seat, always observe the following:

Observe the child restraint system manufacturer's installation and operating instructions.
When using a forward-facing child restraint system in Group I: remove the head restraint from the respective seat, if possible.
When you remove the child restraint system, install the head restraint again immediately and adjust all the head restraints correctly.
The backrest of the forward-facing child restraint system must lie as flat as possible against the backrest of the front passenger seat.
For certain child restraint systems in weight group II or III, there may be restrictions in the maximum size setting, e.g. due to possible contact with the roof.
The child restraint system must not be put under strain between the roof and the seat cushion and/or be installed facing the wrong direction. Adjust the seat backrest inclination accordingly.
The child restraint system must not be put under strain by the head restraints. Adjust the head restraints accordingly.
Never place objects under or behind the child restraint system, e.g. cushions.

The seat belt on the front passenger side is equipped with a special seatbelt retractor.

When activated, the special seatbelt retractor ensures that the seat belt does not slacken once the child restraint system is secured.

Set the front passenger seat as far back as possible and move the seat into the highest position.
Fully retract the seat cushion length adjustment.
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 an almost vertical position.
Install the child restraint system.
The entire base of the child restraint system must always rest on the seat cushion of the front passenger 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 forwards and downwards from the seat belt outlet.
If necessary, adjust the seat belt outlet and the front passenger seat accordingly.

Securing Top Tether

Child safety locks

See More:

Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Seat belts: Fastening and adjusting the seat belts
If the seat belt is pulled quickly or sharply, the seat belt retractor locks. The seat belt strap cannot be pulled out any further. Always engage seat belt tongue 2 of the seat belt into seat belt buckle 1 of the corresponding seat. Press and hold the seat belt outlet release and slide seat belt out ...