Mediocrity:Ha! We just our subaru a few days ago. My husband asked me how the mirrors and wipers work. I had no idea. Thanks for posting and the response. :29:
You push the button on the climate control panel that has a picture of which defogger/defroster is on - there are 2 of threm - it would be the one to the right of the front windshield defogger/defroster button. It works in conjunction with the rear window defroster/defogger - when the rear one is on, the side mirror defogger is on as well!