Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 48

46 Occupant safety
For safety reasons, Mercedes-Benz recom-
mends that you only use a child restraint sys-
tem which has been tested and approved by
Mercedes-Benz in combination with a belt air-
bag.
Information on child restraint systems
( page 61).
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Extending/retracting the seat belt extender in the
rear
The seat belt extender for the rear seat helps you
fasten your seat belt.
Close the door.
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The seat belt extender extends.
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If the vehicle is equipped with the MBUX Inte-
rior Assistant, the seat belt extender extends
when you reach for the seat belt tongue.
The seat belt extender retracts again in the follow-
ing cases:
the seat belt tongue is engaged in the seat
R
belt buckle
the seat belt tongue is not engaged in the seat
R
belt buckle within a certain time
the respective door is opened
R
a certain speed is exceeded after pulling away
R
& WARNING Risk of injury or death due to
an extended seat belt extender while the
vehicle is in motion
If the seat belt does not sit correctly on the
body, it cannot perform its intended protective
function.
Always ensure that the seat belt
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extender is retracted while the vehicle is
in motion.
If the seat belt extender does not retract automat-
ically, it can be retracted manually. To do so,
press the seat belt extender back as far as it will
go before starting the vehicle. Pressing the seat
belt extender back into place requires force.
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You can deactivate the seat belt extender.
Activate the child safety lock for the rear side
windows ( page 76).
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P223 0288 02
When fitting a child restraint system to the
rear seat, observe the vehicle-specific infor-
mation ( page 62).
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Fastening and adjusting seat belts
If the seat belt is pulled quickly or sharply, the
seat belt retractor locks. The seat belt strap can-
not be pulled out any further.
Vehicles with illuminated design seat belt buckles:
the illuminated seat belt buckle makes fastening
your seat belt easier in certain situations, for
example, when light conditions are poor.
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The illumination on the seat belt buckle does
not indicate that the seat belt buckle is func-
tioning correctly.