Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 68

66 Occupant safety
Size class – Left/right rear seat
Equipment
B1 – ISO/F2X IUF
A – ISO/F3 IUF
IL Suitable for ISOFIX child restraint systems according to the table
in "Overview of the recommended child restraint systems", or if the
vehicle and the seat are listed on the child restraint system manu-
facturer's vehicle model list.
IUF Suitable for forward-facing ISOFIX child restraint systems of the
"Universal" category in this weight group.
(1) When using a child restraint system of size class (ISO/R3),
move the front seat into the highest position. Make sure that the
seat backrest of the front seat does not rest against the child
restraint system.
▌Overview of suitability of the seats for attaching
i‑Size child restraint systems
i‑Size is a standardised securing system for spe-
cially designed child restraint systems.
° The symbol indicates seats suitable for
attaching an i‑Size child restraint system in
accordance with UN R129 (
Child restraint systems that are permitted
in accordance with UN R44 as per the ISO-
FIX tables ( page 65) or UN R129 as per
/
the following i‑Size tables may be attached.
i‑Size child restraint systems (ISO/R2, ISO/F2X,
ISO/B2, ISO/B3)
Front passenger seat Left/right rear seat
X i‑U
X Not suitable for an i-Size child i-U Suitable for forward-facing
restraint system in the "Univer- and rearward-facing i-Size child
sal" category. restraint systems in the "Univer-
sal" category.
P223 0288 02
▌Fitting an ISOFIX or i‑Size child restraint system
on the rear seat
& WARNING Risk of injury or death if the
permissible gross mass of the child and
child restraint system together is excee-
ded.
page 63).
/
Too much load may be placed on the ISOFIX
or i‑Size child restraint systems and the child
may not be restrained correctly in the event of
an accident, for example.
If the child and the child restraint system
#
together weigh more than 33 kg, only
use an ISOFIX or i‑Size child restraint
system with which the child is secured
with the vehicle seat belt.
Also secure the child restraint system
#
with the Top Tether belt, if available.
Always comply with the information about the
mass of the child restraint system:
in the manufacturer's installation and operat-
R
ing instructions for the child restraint system
used