2006 GMC Yukon Owner's Manual - Page 133

Mirrors {CAUTION: Manual Rearview Mirror Four-wheel drive vehicles with the transfer case in NEUTRAL will allow the vehicle to roll, even if your shift lever is in PARK (P). So, be sure the transfer case is in a drive gear - not in NEUTRAL. Always set your parking brake. Follow the proper steps to be sure your vehicle will not move. See Shifting Into Park (P) on page 2-32. If you are pulling a trailer, see Towing a Trailer on page 4-60. Pull the tab under the mirror toward you to reduce glare from headlamps behind you after dark. Push the tab away from you for normal daytime operation. Automatic Dimming Rearview Mirror with OnStar® and Compass Your vehicle may have an automatic-dimming rearview mirror with a compass and the OnStar® system. There are three additional buttons for the OnStar® system. See your dealer for more information on the system and how to subscribe to OnStar®. See OnStar® System on page 2-50 for more information about the services OnStar® provides. 2-37