GMC 2015 Sierra Owner's Manual page 15

1-8 In Brief
Power Seats
To adjust a power seat, if equipped:
Move the seat forward or
rearward by sliding the control
forward or rearward.
If equipped, raise or lower the
front part of the seat cushion by
moving the front of the control
up or down.
If equipped, raise or lower the
seat by moving the rear of the
control up or down.
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.