GMC 2011 Sierra Owner's Manual page 18

1-12 In Brief
Power Lumbar
To adjust the power lumbar support,
if equipped:
On vehicles with two-way
lumbar, press and hold the
top or bottom of the control to
increase or decrease lumbar
support.
On vehicles with four-way
lumbar, press and hold the
front or rear of the control to
increase or decrease lumbar
support. To raise or lower the
height of the support, press
and hold the top or bottom
of the control.
See Lumbar Adjustment on
page 3 6 for more information.
I n f o r ma t i o n P r o v i d e d b y :
Reclining Seatbacks
Manual Reclining Seatbacks
To recline a manual seatback:
1. Lift the lever.
2. Move the seatback to the
desired position, and then
release the lever to lock the
seatback in place.
3. Push and pull on the seatback to
make sure it is locked.