Chevrolet Tracker 2003 Owner's Manual page 9

Manual Lumbar
If your vehicle has this feature, turn the knob located on
the driver's side seatback to adjust support of the
lower back.
Reclining Seatbacks
To adjust the seatback, lift the lever on the outboard
side of the seat cushion. Release the lever to lock the
seatback where you want it. Pull up on the lever,
and the seatback will go to the upright position.
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