2001 Chevrolet Blazer Owner's Manual - Page 127

At night, when the glare is too high, the mirror will gradually darken to reduce glare (this change may take a few seconds). The mirror will return to its clear daytime state when the glare is reduced. The mirror will also return to its clear daytime state when the vehicle is put into REVERSE (R). Press the AUTO button at the base of the mirror to turn on the automatic feature. The button has an indicator light to show it is on. Press the OFF button to turn the automatic feature off. Time Delay The automatic mirror has a time delay feature which prevents unnecessary switching from the night back to the day position. This delay prevents rapid changing of the mirror as you drive under lights and through traffic. Cleaning the Photocells Use a cotton swab and glass cleaner to clean the photocells when necessary. Electrochromic Day/Night Inside Rearview Mirror with OnStarR (If Equipped) Your vehicle may be equipped with an electrochromic day/night rearview mirror with the OnStar system. This mirror functions exactly as the electrochromic mirror described previously with the exception of the three OnStar buttons located at the bottom of the mirror face and the ON/OFF button to the left of the OnStar controls. Press the ON/OFF button to turn on the electrochromic mirror. Press the button again to turn it off. See your dealer for more information on subscribing to OnStar. See "OnStar System" in the Index for more information on using OnStar. 2-59