Jimax

My CEL came on. I took the car into the dealer (got me another F150 as a loaner too!). Dealer just called and said my clutch input signal switch was faulty. He had no clue what it was except that it was not the regular clutch, but some other clutch on the engine, possibly the clutch that drives the AC compressor (although my AC works perfectly). He wasn't even 100% certain about the AC clutch.

Anyone have a clue what that is?