OK, let me try and help you further.
Yes, always check fuses first. They are listed in your owners manual.
Next step would be to pull the door switch out and check for power at the wires going into the mirror switch. Without a wire diagram maybe a hit or miss on finding the hot. Thing is if you don't find any hot wire when you should, it's not the switch and could either be the wiring itself or a module. If you get power but the mirrors don't work, then test for output power when adjusting the mirror. No output power but input OK = Bad Switch.
BTW, you can use those basic diagnostic steps with a Volt Meter to test just about any switch.