2009 Hummer H3T Owner's Manual - Page 99

Features and Controls 2-33 Mirrors Automatic Dimming Rearview Mirror The vehicle has an automatic dimming rearview mirror with a compass and temperature display. 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 2-39 for more information about the services OnStar® provides. 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. • At start up, if the vehicle has been off for less than two and a half hours, and the last stored temperature was less than the current temperature, the sensor will increase 1°F every two minutes until the correct temperature is displayed. Temperature Display To adjust between Fahrenheit and Celsius: • If the vehicle has been off more than two and a half hours, or the last stored temperature is greater than the current temperature, the current temperature immediately displays. • Press z for approximately four seconds to toggle the display from F (Fahrenheit) to C (Celsius) to OFF. Release the button after the display has toggled to the next state. The temperature display will remain in its current state each time the ignition goes through its cycle. • If the temperature is 37°F (3°C) or lower, ICE will flash on the temperature display. This display will flash every two seconds for a period of one minute. If an abnormal temperature reading is displayed for an extended period of time, see your dealer/retailer. Under certain circumstances, a delay in updating the temperature is normal. z (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 2-36 for more information.