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I'm not trying to interfere here, just noticed there was some difficulty with the image upload...
There are literally 40 or 50 pages of electrical schematics for this vehicle in my database, I think these show some of the circuits that the other specialist wants to depict for you.
I think you may be on the right track, checking for a B+ loss to the powertrain controller, maybe a failed ASD relay, or a poor control circuit ground are a good place to start...
I'll let specialist JimS take over from here, if you need schematic illustrations for some other circuit I did not upload, let me know and Ill see what I can dig up. When your question is answered to your satisfaction, the accept belongs to specialist JimS.