P3000 after a long struggle

This is a bit of a TLDR, but I am stuck.
2008 w/180k. I replaced a few modules about 18 months ago, and had no issues until about 5 weeks ago. I chose to try to recondition the cells (and utilize my best cells and the best of the lot I bought last time). After almost 4 weeks of cycling cells with great results I replaced the worst and reinstalled the HV battery. Alas, the 12v was seriously discharged, and a quick jump got it started. All codes gone. Drove and ran for 20ish minutes. When I turned it off, everything was dead again. Repeated a jump with no issues, then put the battery on a charger and tested it after a second run (5.7v, yikes). Anyway, trickle charged for 2 days and reinstalled. Started right up, but then immediately threw the P3000 (makes me think it’s not a cooling issue.)
I do not have Techstream, but free DrPrius, and CarScanner apps.
Here’s what I’ve checked:
Other than the code, drives as normal (though fuel gauge is also blinking empty despite being very full)
HV Battery 220 v
All cells have greater than 4.0 Ah capacity, majority well over 5.0.
All cells within 0.12v after cycling up to 80% and down to 20%(balanced for a week waiting for the bus bars)
12v: 12.4v engine off
All new bus bars and nuts
All connections and related fuses (high desert car with zero rust)
Hybrid pack cooling blower works (tested at 12v, and from 0.8-2.0 amps)
oh, and I noticed when raising the temperature of the battery fan threshold, the red triangle stays off, until the temps rise and the car tries to turn the blower on. Then the code is thrown again within 5 seconds.
This is my third/ fourth time battery out, so it’s easy now, BUT,
What am I missing?

 

Yes, zero corrosion on any connections, just on the copper bus bars, which were replaced with zinc coated ones.

 

Update as of 7/14/24@11:23 Utah time. I checked the voltage to the hybrid battery fan motor connection. 0.0 volts when the car is on, but no cooling is required, then using Dr Prius app to set a lower temp, I clicked it on. I can instantly hear a click of the relay (all clean connections), and the voltage jumps to 13.85. But I hook up the motor, and nothing (besides a thrown code). So it’s gotta be the motor, right? Except when I bring the motor in and hook it up to my hobby charger that can output any voltage and amperage, it blows air. Set At 12v and 1 amp, it is drawing about 0.95 amps. I hate to throw parts at it, if the motor works. Connections are clean on both ends. Still stumped…

 

Thanks! I’m no electrician- but have basic understanding. I held the red on the + connection that would touch the + on the motor, and the black to the - side. I can hear the relay functioning when the fan is activated. When it’s not, (open circuit), I got a varying couple mV at most, and then it jumped right to 13.85V when working. But will not run the motor.
I did the same to the motor from my charger, and it runs.
If the relay is keeping the circuit open until needed, it shouldn’t have continuity until “on”, correct?
Heading out after breakfast to see if I can find/ test any of those circuits.

 

Getting 13.90 V at the motor connection, but zero continuity, with relay and fan “on” and code thrown.
Motor has continuity.
13.97 V at the positive motor connection, and negative on chassis ground.


Tested the relay too, and got resistance on the silver tabs. 170-300ish Ohms if I remember.