Chevrolet Optra 2004 Owner's Manual page 10

Driver Seat Height Adjuster
Turn the front knob to adjust the height of the front
portion of the seat cushion. Turn the rear knob to adjust
the height of the rear portion of the seat cushion.
1-4
To adjust the height of the
driver's seat cushion, turn
the knobs located on
the outboard side of the
seat cushion.
Manual Lumbar
Your vehicle may have manually operated lumbar
support for the driver's seat.
Push the lever down to adjust the support for the lower
part of the seatback. Pull the lever up to return the
support to its original position.
To adjust the front seat
lumbar support, use the
lever located on the
outboard side of the
seatback.