Fan issue with AC trinary switch

[A1971Blazer]

'67 C10 with '02 LS1
I'm running the Entropy LS swap radiator with dual fans.

Fan 1 is wired to the PCM only, it triggers the relay at 195º, it works perfectly.
Fan 2 is also wired to the PCM to trigger at 205º and it's also wired to the trinary switch and connected to the same trigger (ground).

The fan will come on via the trinary switch or the PCM or both ( I assume)
I'm getting a code P0481 (fan 2) when I have the AC on and the PCM triggers the fan 2 relay. I did find a loose connector in my load center for the fan 2 relay but I fixed that.

I'm wondering if the trinary switch and the PCM fan trigger being wired together is causing the issue, and what is the best/easiest way to correct it?