Cadillac 1998 Seville Owner's Manual page 108

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.
Mirror Operation
To turn on the automatic dimming feature, press AUTO.
To turn off automatic dimming, press OFF. The
indicator light will be illuminated when this feature
is active.
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 Daymight Rearview Mirror
with Compass ( I f Equipped)
Your vehicle may have an electrochromic inside
rearview mirror with
a
compass.
L
1
When set in the MIRROR position, this mirror
automatically changes to reduce glare from headlamps
behind you.
The mirror also includes an eight-point
Cti~pa"ss
display
in the upper right corner of the mirror face. When on,
the compass automatically calibrates as the vehicle
is driven.