2005 GMC Yukon Owner's Manual - Page 202

Security Light This light flashes when the vehicle security system is activated. Highbeam On Light This light will come on when the high-beam headlamps are in use. Cruise Control Light This light comes on whenever you set your cruise control. See Headlamp High/Low-Beam Changer on page 3-8. Four-Wheel-Drive Light The four-wheel-drive indicator will light up when the vehicle is in four-wheel drive. The light will go out when the cruise control is turned off. See Cruise Control on page 3-11 for more information. See Four-Wheel Drive on page 2-27 for more information. 3-52