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I agree, wish I could just get a JY unit on the cheap. But the stupid pass lock requires the dealer to unlock the vins.Change out the Bose head unit (radio). It sounds like you have a short somewhere in the preamp circuit, or the switching circuit that powers up the sub woofer amp, that is adding to the normal key off draw of the radio head unit's memory. The fact that you're not getting a sub amp turning on and powering up, nor sound from the subwoofer, after replacing both of those and the fuse for the sub amp points to the switching circuit being the culprit.
I jave been thinking about this. Issue is I need to rip the dash apart and pull the head unit to access the pigtail. It's definitely the next step as I know sometimes other items may be on the radio circuit.Not sure how much of a deal it is to get to the head unit main connector, but I would try disconnecting it and plug the fuse back in and see. that will verify if the head unit is the issue or there is something else on that circuit causing a draw.
Though I have never done the test using a digital meter, I have always used a test light looking at how bright or dim the bulb is. the ECM will always pull some, and can kill a battery if left sitting for a couple weeks. my Dodge ram will kill the battery flat in two weeks if I don't disconnect it.