How do I use the heated seats in the 2007 Buick Lucerne?

To operate the heated seats, the ignition must be on, and the buttons are located on the front doors forward of the door handle. Press the heated seat cushion and seatback button to turn on the feature at the highest setting, and each subsequent press decreases the temperature one setting. There are three temperature settings indicated by a column of three lights — three lights for high, two for medium, and one for low. To turn the feature off, keep pressing the button until the display lights turn off. (Page 11)