GMC Yukon Owner's Manual page 44

Move the seat forward or rearward by sliding the control
forward or rearward.
Your vehicle may have additional features to adjust your
vehicle's power seat:
Raise or lower the front part of the seat cushion by
moving the front of the control up or down.
Raise or lower the rear part of the seat cushion by
moving the rear of the control up or down.
Raise or lower the entire seat by moving the entire
control up or down.
On seats with power reclining seatbacks, the control is
located behind the power seat control on the outboard
side of the seats. See Power Reclining Seatbacks
under Reclining Seatbacks on page 2 12.
A vehicle with a memory function allows seat settings to
be saved and recalled. See Memory Seat, Mirrors, and
Pedals on page 2 10 for more information.
2-6
Manual Lumbar
On vehicles with this feature the control is located on
the outboard side of the seat.
Increase or decrease lumbar support by turning the
knob forward or rearward.