Pontiac 2008 G5 Owner's Manual page 48

2.3. If you have an adjustable headrest or head
restraint, raise the headrest or head restraint.
2.4. Route, attach, and tighten the top tether
according to your child restraint instructions
and the following instructions:
1-44
If the position you are
using does not have a
headrest or head restraint
and you are using a
single tether, route the
tether over the seatback.
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.
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
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.
If the position you are
using has a fixed or
adjustable headrest or
head restraint and you
are using a dual tether,
route the tether around
the headrest or head
restraint.