Hummer H2 2009 Owner's Manual page 65

If the position you are using
does not have a headrest
or head restraint and you
are using a dual tether,
route the tether over the
seatback.
If the position you are using
has an adjustable headrest
or head restraint and you
are using a single tether,
raise the headrest or head
restraint and route the
tether under the headrest
or head restraint and in
between the headrest or
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 headrest
or head restraint and you
are using a dual tether,
raise the headrest or head
restraint and route the
tether under the headrest
or head restraint and in
between the headrest or
head restraint posts.
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