Buick Rendezvous 2003 Owner's Manual page 9

To lower the seat, push the lever down. Adjust the seat
and release the lever.
To raise the seat, pull
up on the lever located on
the front right side of
the seat.
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CAUTION:
You can lose control of the vehicle if you try to
adjust a manual driver's seat while the vehicle
is moving. The sudden movement could startle
and confuse you, or make you push a pedal
when you don't want to. Adjust the driver's
seat only when the vehicle is not moving.
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