2009 GMC Yukon Owner's Manual - Page 154

{ CAUTION: It can be dangerous to get out of the vehicle if the automatic transmission shift lever is not fully in P (Park) with the parking brake firmly set. The vehicle can roll. Do not leave the vehicle when the engine is running unless you have to. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure the vehicle will not move, even when you are on fairly level ground, always set the parking brake and move the shift lever to P (Park). Follow the proper steps to be sure the vehicle will not move. See Shifting Into Park on page 2-44. If pulling a trailer, see Towing a Trailer on page 4-52. Mirrors Manual Rearview Mirror Hold the inside rearview mirror in the center to move it for a clearer view behind your vehicle. Adjust the mirror to avoid glare from the headlamps behind you. Push the tab forward for daytime use and pull it for nighttime use. Automatic Dimming Rearview Mirror { CAUTION: Four-wheel drive vehicles with the transfer case in N (Neutral) will allow the vehicle to roll, even if the automatic transmission shift lever is in P (Park). So, be sure the transfer case is in a drive gear - not in N (Neutral). Always set the parking brake. The vehicle may have an automatic dimming rearview mirror. Vehicles with OnStar® have three additional control buttons for the OnStar® system. See your dealer/retailer for more information about OnStar® and how to subscribe to it. See OnStar® System on page 2-64 for more information about the services OnStar® provides. 2-48