GMC 2001 Envoy - Manual (Page 59)

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If your vehicle is equipped with the rear convenience
system, there will be plugs covering the anchor brackets.
To remove the plugs, grasp the edges of the plugs and
pull them out. See “Rear Convenience System” in the
Index for more information. Don’t use the rear set of
tie
- down brackets near the liftgate/endgate or the center
tie - down bracket near the rear seats.
Anchor the top strap to one of these anchor points.
Be sure to use an anchor point located on the same
side of the vehicle as the seating position where the
child restraint will be placed.
Once you have the top strap anchored, you’ll be ready
to secure the child restraint itself. Tighten the top
strap when and as the child restraint manufacturer’s
instructions say.