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I found it myself it is the variable blower control module, big white plug under the passenger side dash. Takes about 30 seconds to take out, don't need to take apart the glove box like I did as well.
New unit cost 72 dollars at Mossy Nissan, but it's a dealer-only item so that's what happens sometimes. They changed the setup from a five-fin to a four-fin, hopefully it is more resilient.
Decent schematic here:
It's where "21" should be, except that it's a VBC, not just a resistor, which means it is bigger and incorporates the resistor into the entire unit.
Hope this helps anyone experiencing a similar problem.
New unit cost 72 dollars at Mossy Nissan, but it's a dealer-only item so that's what happens sometimes. They changed the setup from a five-fin to a four-fin, hopefully it is more resilient.
Decent schematic here:

It's where "21" should be, except that it's a VBC, not just a resistor, which means it is bigger and incorporates the resistor into the entire unit.
Hope this helps anyone experiencing a similar problem.