2007 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 come on 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. Memory Seat and Mirrors If your vehicle has this feature, the controls for the memory function are located on the driver's door. These buttons are used to program and recall memory settings for the driver's seat and both the driver's and passenger's outside mirrors. The settings for these features can be saved for up to two drivers. 12