33 Restraint systems and airbags ›  Fasteners for child seats Fasteners for child seats Use of child seats Overview of usability of child seats according to standard ECE-R 16. Group Size category of child seat  a) Front passenger’s seat Rear seats With activated front airbag With deactiva- ted front airbag Outer seats Centre seat 0 (up to 10 kg) E X X IL X 0+ (up to 13 kg) E D C X X IL X 1 (9-18 kg) D C B B1 A X X IL IUF X 2 (15-25 kg) - X X IL X 3 (22-36 kg) - X X IL X a) The size category of the child seat is indicated on the child seat plate. Child seats with the ISOFIX system IL  The seat is suitable for the ISOFIX child seats with “Semi-Universal” approval. IUF  The seat is suitable for forward-facing child seats and is permitted for use in this weight category. X  The seat is not equipped with eyelets for the ISOFIX system. Group Front passenger’s seat Rear seats With activated front airbag With deactivated front airbag Outer seats Centre seat  a) 0 (up to 10 kg) X U  b) U U 0+ (up to 13 kg) X U  b) U U 1 (9-18 kg) UF U U U 2 (15-25 kg) UF U U U  c) 3 (22-36 kg) UF U U U  c) a) It is forbidden to install a child seat with a support foot in the middle rear seat. b) Adjust the height-adjustable front passenger seat as much as possible. c) If the centre rear seat is not equipped with a headrest, only use a group 2 or 3 child seat if it has its own integrated headrest. If the child seat does not have this support, then attach the child seat to the outer rear seat. Child seat fastened with a safety belt U  The seat is suitable for the child seat category “Universal” and is permitted for use in this weight group. UF  The seat is suitable for forward-facing child seats in the “Universal”category and is permitted for use in this weight group.