Chevrolet 2002 Venture Owner's Manual page 26

If the front latches are not attaching correctly, check
that the seat is in the full rear position.
1-20
3. Firmly push the rear hooks onto the rear floor pins
by pushing down the rear of the seat.
4. Try to raise the seat to check that it is locked down.
5. Lift the seatback recliner lever or pull the nylon strap
on the back of the seat and raise the seatback until it
locks upright.
6. Push and pull on the seatback to make sure that it is
locked in place.