Pontiac 2008 Grand Prix Owner's Manual page 49

2.3. Route, attach, and tighten the top tether
according to your child restraint instructions
and the following instructions:
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 a fixed headrest
or head restraint and
you are using a single
tether, route the tether over
the headrest or head
restraint.
If the position you are
using has a fixed headrest
or head restraint and
you are using a dual tether,
route the tether around
the headrest or head
restraint.
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