Chevrolet 2007 TrailBlazer Owner's Manua page 60

1.3. Put the child restraint on the seat.
1.4. Attach and tighten the lower
attachments on the child restraint to the
lower anchors.
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 and tighten the top tether
according to your child restraint
instructions and the following
instructions. If your vehicle has a cargo
shade, route the top tether between
the seatback and the cargo shade.
60
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.