Back to topic.
I have 1024 man-years experience in saving BMW electrical power and I developed a solution how you can hook up the PROcede to switched power and wake it up when the ECU wakes up to check the sensors, usually every 14 minutes.
As everytime, I invested a lot of time and efforts. It's not my fault when it's the same solution as AA does it with the Xede, it's just what I found working best.
Sounds familiar, huh ?
I will come up with this next weekend.