If it was me...after doing all the checks you have done:
I'd start at the switch on the dash, pull it out and see if there's a connection problem when the button is pushed
Then I'd probably move to run a 12v trial wire directly to the shade itself
If the shade motor does not work with direct 12v connection, then it's the motor.
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'17 Vegas 24.1
Fallbrook, CA
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