GMC Sierra Instruction Manual page 13

12 In Brief
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 0 57.
Reclining Seatbacks
Manual Reclining Seatbacks
To adjust a manual seatback:
1. Lift the lever.
The seatback will automatically
fold forward.
2. To recline, move the seatback
rearward to the desired
position, then release the lever
to lock the seatback in place.
3. Push and pull on the seatback
to make sure it is locked.
I n f o r ma t i o n P r o v i d e d b y :
To return the seatback to the upright
position:
1. Lift the lever fully without
applying pressure to the
seatback, and the seatback will
return to the upright position.
2. Push and pull on the seatback
to make sure it is locked.
See Reclining Seatbacks 0 58.
Power Reclining Seatbacks
To recline a power seatback,
if equipped:
Tilt the top of the control
rearward to recline.