GMC 2015 Sierra Owner's Manual page 16

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.
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.
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 on
page 3-5.
In Brief
Power Reclining Seatbacks
To recline a power seatback,
if equipped:
Tilt the top of the control
rearward to recline.
Tilt the top of the control forward
to raise.
See Reclining Seatbacks on
page 3-5.
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