GMC 2006 Yukon XL Owner's Manual page 71

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:
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, raise
the head restraint and route
the tether under the head
restraint and in between
the head restraint posts.
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