Anyway to test to see if this is the issue? Maybe I can get the part at a local parts store.Very likely to be the controls module in the dash. My '10's went out about a year and a half ago.
The connector area on the module had "distorted" form heat/amperage going through it, and it stopped working on two settings.
Replaced under warranty, but I think the module costs about $80, if you're doing it yourself.