The mirror wiring harness is ran through the A-pillar, where part of the side airbags resides. Improper install or some freaky co-incidence during a collision can put the wires in front of the airbags when they blow up, and cause a hell of a mess. that's why it would be your and your dealer's responsibility if something goes sideways...
I would probably find a switched 12V somewhere around the sunroof controls and forget about running the wires via the A-pillar if I had to do this install...
I would probably find a switched 12V somewhere around the sunroof controls and forget about running the wires via the A-pillar if I had to do this install...