2001 Chevrolet Impala Owner's Manual - Page 129

One photocell on the front of the mirror senses when it is becoming dark outside. Another photocell, facing rearward, senses headlamps behind you. To turn the electrochromic feature off, press the button in the center of the mirror again. To keep the photocells operating well, occasionally clean them with a cotton swab and glass cleaner. There are two map lamps located on the bottom of the mirror. Each lamp is turned on and off by pressing the button next to the lamp. Electrochromic Day/Night Rearview Mirror with OnStarR and Map Lamps (Option) Your vehicle may have an automatic electrochromic day/night rearview mirror with the OnStar System. The automatic dimming feature is turned on or off by pressing the far left button, located on the lower part of the mirror face, for up to three seconds. When turned on, this mirror functions exactly like the electrochromic mirror described previously. See "Mirrors, Electrochromic Day/Night Rearview" in the Index for more information. There are also three OnStar buttons located at the bottom of the mirror face. See your dealer for more information on the system and how to subscribe to OnStar. See "OnStarR System" in the Index for more information about the services OnStar provides. 2-59