It's on the row of climate control buttons above the ash tray...
http://i471.photobucket.com/albums/rr76/2002LS8/button.jpg
http://i471.photobucket.com/albums/rr76/2002LS8/button-1.jpg
http://i471.photobucket.com/albums/rr76/2002LS8/button.jpg
http://i471.photobucket.com/albums/rr76/2002LS8/button-1.jpg