Finally made progress on no sleep mode. F11 - Immobilizer and F60 - GMIII have amp draws.
F11 - starts near 850 milliamps then drops to 750 milliamps beyond 16 minutes
F60 - starts and stays near 450 milliamps.
Together they pull the battery down fast. F60 was blown for a while until I found it. The rear doors, hatch, and tailgate didn't work. All the doors lock now work with FOB and console switch.
The GMIII was repaired. I may send it back to double check something has not been damaged while searching for all the trouble.
Progress so far:
F74 removed
FSR replaced
GMIII refurbished
Door modules unplugged and tested for sleep mode. No change. Tried a replacement too.
Key electrical cylinder replaced
All other fuses have been tested for amp draws too. Shops says the spec is 16-18 milliamps.
Currently not working: all interior lights don't work. Does this point to a GMIII module fault?
Next: look at everything on those two circuits.
Where should I start? Knowing is half the problem. Finding the solution will be a long process.
What should I look at first?
(Resolved)
A GMIII module installation and coding fixed all the remaining small issues. Fixed with an ebay used module: interior lights, windshield washer pump, BC button functions, no more F60 battery drain, and it goes to sleep after 16 minutes. F60 no longer has amp draw. F60 feeds, rear door locks, liftgate, and lower tailgate.
The used GMIII fixed everything so sleeping amps are factory specs, 18 mA!!
Eventually, I'll clone the used GMIII module. Having a replacement for testing or use, will save a lot of troubleshooting time.