2009 Chevrolet Silverado 2500 HD Extended Cab Owner's Manual - Page 157

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. Follow the proper steps to be sure the vehicle will not move. See Shifting Into Park on page 2-52. If pulling a trailer, see Towing a Trailer on page 4-50. The vehicle may have an automatic dimming inside 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 2-71 for more information about the services OnStar® provides. O (On/Off): Press to turn the dimming feature on or off. The vehicle may also have a Rear Vision Camera (RVC). See Rear Vision Camera (RVC) on page 2-65 for more information. If the vehicle has RVC, the available. 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. O button may not be Automatic Dimming Mirror Operation Automatic dimming reduces the glare from the headlamps of the vehicle behind you. The dimming feature comes on and the indicator light illuminates each time the ignition is turned to start. 2-57