Dash rear wipers defrost heat ac recirculate controls all failed at once

Fuses fine terminal connector failure? Where is it? Heat sliders won't deliver heat to air (blows cold) Blower works Selector won't adjust location of air from dash to floor or defrost.No rear wipers settings work. Rear window defrost not working, nor ac nor recirculate. Fuses test OK.All failed at one time Is a terminal junction loose somewhere the cause and where could it be?

Thanks so much Bob