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      04-08-2012, 12:45 AM   #1
Wilsonv
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Black dot on the rear view mirror??

Hey guys, i went to test drive the bmw z4 2011 sdrive30i today.
On the rear view mirror, the one inside of the car there was a black dot on it? Is this normal?
the dealer said it was to dim lights, but i have an audi a5, and it does not have a black dot and it still does the job.

please help
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      04-08-2012, 01:20 AM   #2
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its the sensor to darken the mirrors when theres headlights behind you.

Its a lil oversensative IMHO, mine gets dark even when theres noone behind me.
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      04-08-2012, 10:26 AM   #3
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Quote:
Originally Posted by STOOF
its the sensor to darken the mirrors when theres headlights behind you.

Its a lil oversensative IMHO, mine gets dark even when theres noone behind me.
True that
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      04-08-2012, 11:21 AM   #4
Wilsonv
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i see, so it's not a malfunction. I was a bit worried when i saw the dot, as it is so visible.
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      04-08-2012, 05:13 PM   #5
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Its not a dot, it is a hole in the mirroring silver to let light through to a sensor in behind the mirror.

Your Audi must have its sensor somewhere else.

It is very common for cars with auto dimming mirrors to have a sensor mounted in the actual mirrors.
Otherwise they would dim only when a bright light hits the sensor and not when a bright light hits the mirror. (which is why they should dim)
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