Chevrolet 2003 Astro Owner's Manual page 16

Replacing the Rear Seats
1. Lower the seat into position. Make sure the front
retainers are hooked onto the anchor pins.
2. Pull the seat down to latch the rear retainers.
Make sure the seat is locked in by pulling up
and down on the seat.
A seat that isn't locked into place properly can
move around in a collision or sudden stop.
People in the vehicle could be injured. Be sure
to lock the seat into place properly when
installing it.
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