I bought this 2nd hand from my local Toyota dealer back in August. This morning was the first frost we've had since, and I noticed that the heated door mirrors do not work. Heated rear windscreen works fine. I assume my model has this feature? If so, any ideas what could be the problem? Are these on a separate fuse to the rear windscreen? If so, what fuse is it? If its not fuse related, any other ideas? Thanks Folks!