Hummer 2007 H2 Owner's Manual page 68

68
If the position you are
using does not have a
head restraint and
you are using a dual
tether, route the
tether over the
seatback.
If the position you are
using has an adjustable
head restraint and
you are using a single
tether, raise the
head restraint and route
the tether under the
head restraint and
in between the head
restraint posts.
3. Push and pull the child restraint in different
directions to be sure it is secure.
If the position you are
using has an adjustable
head restraint and
you are using a dual
tether, raise the
head restraint and route
the tether under the
head restraint and
in between the head
restraint posts.