GMC 2009 Sierra - Manual (Page 7)

Power Lumbar
If the seats have power lumbar, the controls used to
operate this feature are located on the outboard side of
the seats.
• To increase lumbar support, press and hold the front
of the control.
• To decrease lumbar support, press and hold the rear
of the control.
• To raise the height of the lumbar support, press and
hold the top of the control.
• To lower the height of the lumbar support, press and
hold the bottom of the control.
Release the control when the lower seatback reaches
the desired level of lumbar support.
Your vehicle may have a memory function which allows
seat settings to be saved and recalled. See Memory
Seat, Mirrors, and Pedals on page 1-4 for more
information.
Keep in mind that as your seating position changes, as
it may during long trips, so should the position of
your lumbar support. Adjust the seat as needed.
1-3