Cooling fans not working

Driver side cooling fan doesn't come on, passenger side fan only comes on when AC is turned on. Pull the fans out and tested; both working correctly. Checked the connection to the black finned fan control box, in the front, they look clean and tight, checked the hood switch; although I need to replace it...broken prawn legs...it's working, and the connections to the control box inside the car on passenger side also looks ok...hard to tell by just looking...what next?

Will be cleaning and wrapping these cables...looks ugly but the cables look ok.