2015 Expedition no low speed fan

[Liferror]

So, I am going up a 1 mile long steep logging road to my camp, just as i get to the top I started smelling antifreeze and when I stopped at my place, nothing but steam out the front. I blew half the upper hose barb off the radiator. Borrowed a truck and went to the local ford place and got a couple gallons of antifreeze. Made a circle out of 12 ga copper and epoxy it to what was left of the barb. Left set over night and put it together, filled it up and took it for a test drive while monitoring the temp through Autoenginuity. Coming back up the hill it got up to 230 so I decided to check the fans operation. 1 fan runs for low speed and both fans run for high speed. Autoenginuity shows the relay activated for low speed but no fan, both fans work on high speed so I know the fans are good. I have been doing electrical work on vehicles, boats, trucks and heavy equipment for 55 years and I am baffle by the diagram for low speed operation, I can not see how it grounds for low speed, I see how high speed works, but cannot figure where the ground is for low speed. Maybe I am just getting old but right now I feel pretty stupid. I have attached a pdf of the fan circuits, maybe some one can straighten me out about where the ground comes from. Sorry to be long winded and thanks for any help.

 

[Utah Driver]

I'm not an expert in this area but I thought most any fan made in the last 30 yrs or so was pulse modulated from the ECM.

 

[Liferror]

Thanks for replying. The relays are controlled by the PCM, each fan is on at it's full speed, they are not variable speed, so they are not pulse modulated. I figured out how to embed the image of the wiring diagram, it should be below.

 

[Liferror]

I got an answer, a friend of mine looked it over and told me the ground goes from pin 87A through the gr-wh wire up and threw fuse 63, then goes through the bn wire to splice 183 and then down through the fan 2 to ground. He told me it is being done that way on more and more cars, I had not seen it before, mostly being retired for 15 years and just doing some side work and had not seen this before.