I fixed my problem. No more parasitic draws. Draw is around 60 mA right now. I'm still working on the car and not driving it daily, but I believe I resolved all my drain issues. Car goes to sleep after 16 minutes as it should.

Did you test total draw after car goes to sleep or it won't go to sleep?
Which circuit is drawing how much?
You can reprogram GMIII module and EWS yourself.
You can disable EWS all together if you don't mind not having Immobilizer.
What do you mean when you say "EWS checks out ok"?
With the multimeter connected and measuring amp draw, disconnect the EWS module and observe the change in draw. Do the same with GM.
I read your post but didn't get it. Can you explain why you think it's the starter and transmission gear inputs that are causing draws?

Which inputs exactly you think are pressed.
You said upper outer button is pressed. I'm not sure which button that is?

For BC and memory buttons, I wouldn't replace them just yet.
While checking for draw, disconnect the BC button/module and see if the amp draw changes. Do the same with the seat. Disconnect the seat harness and see if the draw changes.

Also, if the buttons are pressed or have a short, I don't think they would work at all, right?
Does the BC switch work properly and do all buttons on your seat work?


F60
(30A) Multifunction control module 1