It might just need to be removed and cleaned with some electrical parts cleaner. But the part is available new, and used I'm sure. Here is a new one on ebay, there are several listed:
http://www.ebay.com/itm/ACDELC...359c8Might check Toyota parts too on the price, sometimes they are cheaper. As for getting to it, I understand you just have to pull the trim panel off the car, it snaps in place, and then unplug the controls and it is probably held in place with a few screws.