Hello Customer (name blocked for privacy), Yes this could just be the dash switch. If you could can you test the dark blue wire coming out of the resistor for power on all speeds but high. There should be power there and if there isn't the switch is bad. I say this thinking that you already checked the fuses correct. Here is a wiring diagram to help. Let me know if you need more info.
FIGURE Cell 63 Front HVAC Blower W/ A/C(c)
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Have a Great Day
Mark Bisig