BMW M3 2003 Owner's Manual page 52

Mirrors
52
Interior rearview mirror with
automatic dimming feature
This mirror automatically dims through
an infinitely variable range and switches
automatically to its clear, undimmed
mode whenever you engage reverse
gear.
There are two photocells for automatic
dimming. One photocell – see arrow – is
positioned in the mirror's frame, while
the other is slightly offset on the oppo-
site side of the mirror.
For the mirror to function perfectly,
keep the photocells clean and the area
between the inside rearview mirror and
the windshield free of any obstruction
like stickers, etc.
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