Chevrolet TrailBlazer 2003 Manual page 111

Rear Compartment Storage
Panel/Cover
Your vehicle may have this feature.
Upper Position
Insert the front corners of the panel into the top guides
and slide the panel forward. Press down on the back of
the panel to lock it in place. This acts as a cargo shade.
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CAUTION:
If you were to carry things on the adjustable
shelf when it is in the upper (cargo cover)
position, then during a sudden vehicle
movement or a crash those things could be
thrown around in the vehicle. You or others
could be injured. When it is in the upper
position, always secure any cargo on the floor
beneath the shelf/cover.
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