2005 GMC Sierra 1500 Pickup Owner's Manual - Page 12

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 front seats will shut off automatically when the ignition is turned off. Reclining Seatbacks To adjust the front seatback, lift the manual lever located on the outboard side of the seat. Release the lever to lock the seatback where you want it. Lift the lever again without pushing on the seatback and the seatback will go to an upright position. If your vehicle has power seats with a power recliner, see Power Seats on page 1-4 for further information on how to operate the reclining seatback feature. 1-6