Hi, I know this is an old post but I'm having the exact same issue on my 2009 Aveo. It has led to me pulling the sjb batt fuse every time I park my car. We broke it down by seeing what fuse would stop the drain and so far our outcome has just been to pull the fuse. Did you ever find out what was causing this issue. I'd really love the help and feedback to lead me in the right direction.