Thx folks. I conducted those tests earlier but I sincerely appreciate the ideas and the feedback. Please, challenge my ideas.
I grafted an external wire to replace the violet/blue signal wire that runs thru the harness to the J301 module, T20d connector, pin 16. The result was the same. Bogus BAR. I tested G805 ground & G805 12+ with a test light. The test light creates a load whereas a volt meter simply measures, but the BAR was still incorrect. The 3 pin pigtail enroute thru
Ebay will permit me to completely remove the existing wiring from the circuit. The replacement J301 enroute will replace the existing module. Conceivably, the J301 coming from a junkyard in Florida could have other problems but it's unlikely they will be the same.
My understanding of this operation is the J301 receives data from G805 and other sources and it sends an instruction to the to turn on the fan. is telling me that J301 is NOT requesting fan, demand is 0%, so the doesn't turn the fan on. Until I can get an accurate BAR, the is not going to activate the fan.
However, in order to actually drive the car and have AC, I figured out the following thru trial and error. If u cut/open the signal wire on the fan module, the fan assumes an emergency condition and spins at high speed. Cutting the signal wire also creates 0480 which I clear before tests. With the fan signal wire cut/open, the fan cools the condensor and the engine quite nicely. To turn off the fan when I arrive at my destination, I reconnect the fan signal wire. I installed a SPST toggle switch to make this easy. The fan signal wire uses a signal to regulate the speed of the fan. I have observed that when the engine gets warm, with the signal wire properly connected & the cleared, the radiator temp sensor will turn on the fan. I connected a voltmeter with a long wire hanging out the window so I could observe the voltage change. As the engine gets warmer, the DUTY CYCLE changes and the fan speed increases. Of course, a volt meter can only tell me the average voltage, not the high/low or duration. If all else fails, I may install a variable signal generator in the cabin, wired to the fan signal wire, that instructs the fan to run at 50% which is all that's needed. I hope to avoid that task and prefer to solve the problem but that's why the wife agreed I need a scope.
I love this car. It's fast, quiet and practical. I haul all kinds of stuff in the hatchback so I intend to keep it and fix it. Meanwhile, it's giving me an education, an EE degree. Hahahaha. Thx folks.