GMC 2003 GMT560 T-Series, Owner'S Manual

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To tilt the seatback, turn
the backrest tilt knob. The
knob is located on the
lower cushion, on
the outboard side of the
driver’s seat and the
inboard side of the
passenger’s seat.
To get more support in the
lumbar area of your back,
turn the lumbar adjustment
knob. The knob is
located on the upper
cushion, on the inboard
side of the driver’s
seat and the outboard side
of the passenger’s seat.
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CAUTION:
You can lose control of the vehicle if you try to
adjust the 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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