2002 Chevrolet Silverado 1500 Pickup Owner's Manual - Page 157

Electrochromic Inside Rearview Mirror with Compass, Temperature Display and OnStar Controls (If Equipped) When on, an electrochromic mirror automatically dims to the proper level to minimize glare from lights behind you after dark. Temperature and Compass Display Press the on/off button, located to the far left, briefly to turn the comp/temp display on or off. If the display reads CAL, you will need to calibrate the compass. For more information on calibration, see below. To adjust between Fahrenheit and Celsius do the following: 1. Press and hold the on/off button for four seconds until either a flashing _F, or _C appears. 2. Press the button again to change the display to the desired unit of measurement. After approximately four seconds of inactivity, the new unit will be locked in and the compass/temperature display will return. The mirror also includes a duel display in the upper right corner of the mirror face. The compass reading and the outside temperature will both appear in the display at the same time. 2-77