The best wiring solution for the 1-series is to do a fuse panel tap and run the wiring up along the passenger side A-pillar to the overhead console, and then down towards the mirror.
In all of my previous BMWs, I tapped into a wire in the overhead console, but this didn't work on my previous 135i as the best available power source in the area was interrupted when the sunroof was operated.
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2012 BMW 135i Space Grey Metallic M-Sport DCT Dinan S2
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