Buick 2007 Rendezvous Owner's Manual page 78

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. If you have an adjustable head restraint,
raise the head restraint.
2.3. If the vehicle has the extended rear
convenience center, you need to lift the
cover of the convenience center to
access the anchor for the second row
center position bench seat.
2.4. For the third row bench seat, lift the
carpet to expose the anchor.
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2.5. 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.