1998 Buick Park Avenue Owner's Manual - Page 117

... ... The automatic minor 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 t3E.ough traffic. i ...: ... At night, when the glare is too high, the mirror will gradually daken to reduce glare (this change may take a few seconds). The mirror will return to its clex daytime state when t , glare is reduced. ~