Opel ADAM Owner's Manual page 53

Weight class
Group II: 15 to 25 kg
or approx. 3 to 7 years
Group III: 22 to 36 kg
or approx. 6 to 12 years
IL : suitable for particular ISOFIX restraint systems of the "specific-vehicle", "restricted" or "semi-universal" categories.
The ISOFIX restraint system must be approved for the specific vehicle type
IUF : suitable for ISOFIX forward-facing child restraint systems of universal category approved for use in this weight class
X : no ISOFIX child restraint system approved in this weight class
* : move the respective front seat ahead of the child restraint system to one of the foremost adjustment positions
** : remove respective rear head restraint when using child restraint systems in this size class 3 34
ISOFIX size class and seat device
A – ISO/F3 : forward-facing child restraint system for children of maximum size in the weight class 9 to 18 kg
B – ISO/F2 : forward-facing child restraint system for smaller children in the weight class 9 to 18 kg
B1 – ISO/F2X : forward-facing child restraint system for smaller children in the weight class 9 to 18 kg
C – ISO/R3 : rear-facing child restraint system for children of maximum size in the weight class up to 18 kg
D – ISO/R2 : rear-facing child restraint system for smaller children in the weight class up to 18 kg
E – ISO/R1 : rear-facing child restraint system for young children in the weight class up to 13 kg
Size class Fixture
Seats, restraints
On front passenger seat
X
X
51
On rear seats
IL
IL