Chevrolet 1999 Astro Owner's Manual page 15

Route the belt out of the forward edge of the storage bin.
Close the cover to retain the belt.
4. Pull up on the seatback latch on the right rear of the
seat. Push the seatback down until it locks in place
-
(non touring bench seats only).
2. If you have a safety belt
guide on your seat, pull
the safety belt all the
way out through
the guide.
3. To store the safety belt
while the second row
seat is removed, pull the
belt out and put both
buckles in the
passenger's side rear
storage bin.
5. Lift up on the left and the right seat release levers at
the same time. The latches are near the floor on the
rear legs of the seat.
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