Quote:
Originally Posted by Cruwil
My car doesn't have heated mirrors from the factory
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This is "highly" impossible. AFAIK, all F20/21 have heated mirrors. In cold countries, in particular: do you mean your car was made for Africa or something? You can check your parts applicability here:
https://www.realoem.com/bmw/enUS/select.
Quote:
Originally Posted by Cruwil
I would need to know where the wiring goes from the mirror heating elements.
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Well, in the thread I already quoted there's a video of removing the mirror. I would guess heating wires are in the wire bundle getting detached.
If your car really has no mirror heating you need much more than just the glasses. Besides the wiring, what about control? Factory mirror heating is completely automatic, controlled by the car's computer. "Where the wiring goes from the mirror heating elements" might be simply absent in your car if you don't have the factory mirror heating, which is most unlikely though, as I already mentioned.