Another option is a device like a "PriorityStart!" shutoff, which I put in my old saturn after it developed a parasitic drain somehow and started killing batter

Another option is a device like a "PriorityStart!" shutoff, which I put in my old saturn after it developed a parasitic drain somehow and started killing batteries. In my case, it was easier to put this device in rather than start working through every connection to figure out what changed. That said, for subaru it seems that pulling the DCM fuse seems to stop the drain: https://news.ycombinator.com/item?id=37973829 https://news.ycombinator.com/item?id=37973829