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They work off the switch for the rear windscreen, switch that on and itll switch the heated wing mirrors on. Only 1 works on my RT though and thats the passenger side one, means I have to stick me hand out the window to clean the drivers one lol
Well they have come in very handy recently.. you actually get steam comming off the 172 ones if you leave em on for 5 minutes (takes about 5 minutes for the rear screen to de-ice)