You have to track that back to its original source. Then sort out why that is not giving up 12V.
Let's pick one element that is not working. Something that is limited in the controls. You said the window buttons don't work, correct? Where does power appear/disappear in the chain from the battery? IE - battery --> 80A --> 30A --> ECU-B/Dome light --> G/R wire --> Main Body CU --> Window Regulator master <--> Window switch --> window motor.
Did you blow up your body CU?
