Mercedes-Benz S-Class 2022 Owner's Manual page 76

The identification IUF refers 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
R
"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-specific: child restraint systems in the
R
"vehicle-specific" category may only be used if
the vehicle and vehicle seat are listed in the
child restraint system manufacturer's vehicle
model list.
Approval categories in accordance with UN-R129
Example of an approval label
i‑Size: child restraint systems in the "i‑Size"
R
category are approved for installation in vehi-
cles with i‑Size mounting brackets. They can
be used, in accordance with overviews of the
suitability of seats for securing child restraint
systems, on seats labelled i‑U.
Occupant safety
The identification i‑U refers to i‑Size child
restraint systems in the "Universal" category.
These child restraint systems must also be
secured using Top Tether or support points.
Observe the suitability of vehicle seats
Depending on the approval category, there are
forward-facing and rearward-facing child restraint
systems. Their use can be restricted for certain
vehicle seats:
Suitability of seats for attaching ISOFIX child
R
restraint systems ( page 74)
/
Suitability of seats for securing i‑Size child
R
restraint systems ( page 75).
/
Suitability of seats for attaching belt-secured
R
child restraint systems ( page 80)
/
73