2004 GMC Yukon Owner's Manual - Page 11

To increase support, press and hold the top of the control. To decrease support, press and hold the bottom of the control. Let go of the control when the lower seatback reaches the desired level of support. Your vehicle may have a memory function which allows seat settings to be saved and recalled. See Memory Seat on page 2-62 for more information. To heat the entire seat, press the horizontal button. Press the button to cycle through the temperature settings of high, medium, and low. The indicator light will glow to indicate the level of heat selected. To heat only the seatback, press the vertical button with the heated seatback symbol. An indicator light on the button will glow to designate that only the seatback is being heated. The engine must be running for them to operate. The heated front seats will be canceled after the ignition is turned off. If you still want to use the heated front seat feature after you restart your vehicle, you will need to press the heated seat button again. Heated Seats If your vehicle has this feature, the button used to control the driver's heated seat is located on the driver's door panel. The button used to control the passenger's heated seat is located on the passenger's door panel. 1-5