GMC 2006 Sierra - Manual (Page 57)

2.2. When using a child restraint with a top tether
in the rear passenger position, raise the
head restraint and route the top tether
through the fabric loop. Then, attach the top
tether to the metal anchor point at the
center rear seating position.
2.3. When using a child restraint with a top tether
in the rear center position, route the top
tether through the fabric loop. Then, raise the
head restraint on the passenger side and
attach the top tether to the metal anchor
point located at the rear passenger position.
2.4. Tighten the top tether when and as the child
restraint manufacturer’s instructions say.
3. Push and pull the child restraint in different
directions to be sure it is secure.
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