GMC 2000 Sierra 1500 Pickup Owner's Manual page 15

Cushion Tilt (If Equipped)
If your vehicle has this feature, you can raise or lower
the front of the driver's or passenger's seat with this
lever located at the inside edge of the seat. To raise or
lower the front of the seat, move the lever up or down in
a continuous motion until the cushion reaches the
desired height.
Manual Lumbar Control (If Equipped)
To increase support, turn the knob towards the front of
the vehicle.
To decrease support, turn the knob towards the rear of
the vehicle.
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If your vehicle has a lumbar
adjustment, you can
increase or decrease lumbar
support in an area of the
lower seatback.
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