No HI-beams

It would be helpful to know your model year. I might be looking at the wrong wiring diagram .
Does the blue indicator in the instrument panel turn on and off when you operate the hi-beam switch? If yes, it means the dimmer switch is OK. If not, I suspect the switch itself, since you have already checked the fuses.

Did you actually remove the fog light switch and probe it for voltage? It may only be powered when the parking lights or headlights are on.