Opel Vivaro Owner's Manual page 74

72 Seats, restraints
: adjust seat backrest inclination as far as necessary to a vertical position to ensure that the belt is tight on the buckle
2
side
: move the respective seat ahead of the child restraint system forwards as far as necessary and adjust its backrest
3
inclination as far as necessary to a vertical position
: adjust the respective headrest as necessary or remove if required
4
: single seats: with a child seat installed on the centre seat, usage of outer seats is not allowed
5
: fixed seat bench; folding seat bench is in process of being approved
6