Chevrolet 2009 Aveo Owner's Manual page 14

4. Detach the center safety belt from the mini buckle
by inserting the ignition key into the slot in the mini
buckle, pressing the release button, and allowing
the belt to retract.
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5. Pull up the release knob located on top of either of
the rear seatbacks.
6. Fold the rear seatback forward and down.
To return the seatback to the upright position:
1. Hook the safety belts into the safety belt guide.
2. Lift the seatback up and push it to its original
position.