Buick LaCrosse Owner's Manual page 13

To adjust the seat:
Move the seat forward or
rearward by moving the
horizontal control forward or
rearward.
Raise or lower the front or rear
part of the seat cushion by
moving the front or rear of the
horizontal control up or down.
Raise or lower the entire seat by
moving the control up or down.
See
.
To raise or recline the seatback, tilt
the top of the vertical control
forward or rearward. See
.
To adjust the lumbar support,
if available:
Press and hold the front or rear
of the control to increase or
decrease lumbar support.
Press and hold the top or bottom
of the control to raise or lower
lumbar support.
See
.