Steering wheel radio controls, EVIC buttons and Horn dead. All worked yesterday but today all dead. Could it be a fuse for this whole group?

 

it could be, and the fuse index is in your owners manual.

however since all the issues are in the steering wheel my first thought is the clock spring has gone bad and needs to be changed. This could also cause an airbag light to come on depending on how many circuits are affected.

 

have you had the steering wheel wiring recall performed? the evic, cruise buttons can get chaffed and pull out of the connector that goes into the clockspring

 

I don't know if that's been done. I also just realized that the interior lights stopped working at the same time. Not sure if these are related or coincidental.