GMC Sierra 2015 Owner's Manual page 15

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1-8
In Brief
See Power Seat Adjustment on
page 3-4.
Lumbar Adjustment
Manual Lumbar
If equipped, move the lever up or
down repeatedly to increase or
decrease lumbar support.
See Lumbar Adjustment on
page 3-4.
Power Lumbar
To adjust the power lumbar support,
if equipped:
Press and hold the control
forward to increase or rearward
to decrease upper and lower
lumbar support at the same time.
If equipped, press and hold the
control up to increase upper
lumbar support and decrease
lower lumbar support.
Press and hold the control down
to increase lower lumbar support
and decrease upper lumbar
support.
See Lumbar Adjustment on
page 3-4.

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