Turn on the A/C to MAX Full. That should force both fans to run. That would bypass any and all relays and supply 12 volt power directly to the fans.
You could also look at the Mazda Millenia Workshop Manual (downloadable at various sites), and it will show you what pins on the fan pigtail connector to jump with + and - battery voltage to jump the fans.
But first just turn the A/C on MAX, that should at least rule out if the fan motor itself is dead or not.
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