Reclining Seatbacks - GMC Sierra Denali 2006 Owner's Manual

To heat only the seatback, press the vertical button
with the heated seatback symbol. An indicator light on
the seatback button will be lit to designate that only
the seatback is being heated. Additional presses of the
seatback button will cycle through the heat levels for
the seatback only. Press the horizontal button again to
heat the whole seat.
The heated seats will be canceled after the ignition is
turned off. If you still want to use the heated seat feature
after you restart your vehicle, you will need to press
the heated seat button again.
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Reclining Seatbacks

The front seats have a power recline feature.
Vertical Control: You can use the vertical control of
the power seat controls to adjust the angle of the
seatback. Press the control rearward to recline the
seatback. Press the control forward to raise the
seatback.