1998 GMC Suburban Owner's Manual - Page 125

Electrochromic Inside Rearview Mirror with Compass and Temperature Display (If Equipped) Your vehicle may have electrochromic inside and outside rearview mirrors. When on, an electrochromic mirror automatically dims to the proper level to minimize glare from lights behind you after dark. Temperature Display The mirror also includes a display in the upper right corner of the mirror. This can be used as a compass or to indicate outside a r temperature. i The temperature can displayed by pressing the TEMP be side of the switch. Pressing TEMP switch once the briefly, will toggle the temperature reading and off. on To alternate the temperature reading between Fahrenheit and Celsius, press and hold the TEMP button for three seconds until the display blinks and C". Press F" and release the TEMP switch to toggle between the Fahrenheit and Celsius readings. After five seconds of inactivity, the display will return to a normal temperature reading. 2-47