Buick TERRAZA 2006 Owner's Manual page 56

2. If the child restraint manufacturer recommends that
the top tether be attached, attach and tighten the
top tether to the top tether anchor, if equipped.
Refer to the child restraint instructions and
the following steps:
2.1. Find the top tether anchor.
2.2. Route, attach, and tighten the top tether
according to your child restraint instructions
and the following instructions:
1-50
If the position you are
using does not have a
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
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
head restraint and you are
using a dual tether,
route the tether around the
head restraint.
If the position you are using
has an adjustable head
restraint and you are using
a single tether, route the
tether under the head
restraint and in between the
head restraint posts.