Buick 2010 Lucerne - Manual (Page 13)

Power Reclining Seatbacks
To raise or recline the seatback, tilt the top of the
control forward or rearward.
See Reclining Seatbacks on page 2‑8.
Power Lumbar
On vehicles equipped with either a two-way or four-way
lumbar, the control is located on the outboard side of
the seats.
For a detailed operation description see Power Lumbar
on page 2‑4.
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