Chevrolet 2004 Astro Owner's Manual page 16

3. To raise the seatback, do the following:
3.1. Unlock the seatback latch by pulling up on
the latch release lever at the right rear of the
seat, while pushing down on the upper
edge of the seatback.
3.2. Move the seatback into the upright position.
Make sure the seatback is locked when it is
back in the upright position.
If you are replacing the center seat, connect the right
lap-shoulder belt to the attachment on the seat cushion.
If you have a safety belt guide on your seat, pull the
belt through the guide before reattaching the
lap-shoulder belt to the side of the seat. The release
hole should be facing outward.
If you installed the safety belt with the release hole
facing inward (toward the seat), slide the plastic cover
up so you can see the buckle. Disconnect the seat belt.
Slide the cover back down and reinstall the belt
correctly.
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CAUTION:
A safety belt that is improperly routed, not
properly attached, or twisted won't provide the
protection needed in a crash. The person
wearing the belt could be seriously injured.
After raising the rear seatback, always check
to be sure that the safety belts are properly
routed and attached, and are not twisted.