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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > REQUEST. Manual activation of heated mirrors



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REQUEST. Manual activation of heated mirrors
Published by Nr!qUe
12-17-2009
REQUEST. Manual activation of heated mirrors

I live in south florida, where the mornings bring heavy dew onto my car in 84 degree humid weather.

Is there a way to manually activate the heated mirrors rather than letting them automatically come on after it drops to a certain temperature? The manual says that they come on by themselves, but it doesn't even specify the temperature.

I'm looking for a diy that let's me retrofit a switch that can turn on and off the mirror heaters. Or find some alternative way to activate them
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By ENINTY on 12-25-2009, 09:36 AM
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I'm going from memory here because I have the operational specs of how the heating is activated and the sheet is in the barn and there is a foot of snow on the ground, so I don't feel like walking over there and getting it. I had a Tech print them out for me a few years ago.

Anyway, there is not a manual way to activate the heating function. The heating elements are controlled by computer through the car's CANBUS. The temperature that they activate is at or below 48 deg F. if I remeber correctly. Also the wipers have to activated and cycled for the heating to activate. I think the car assumes that the mirrors will fog in high humidity (along with the windshield) and that the driver has the automatic wipers activated, or has recently done a manual swipe of the wipers.
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