GMC 2002 Yukon XL Owner's Manual page 10

Manual 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 or decrease support, turn the knob toward
the front or rear of the vehicle. Operating effort can
be reduced if you lean forward slightly while turning
the knob.
If your vehicle has a lumbar
adjustment, the knob is
located on the outboard side
of the seat cushion.
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