Did a little bit more diagnosis on it today, this is more for cataloguing the diag process I'm doing. I found a section in the diagnostics that tracks wakeup commands, what module issues it, and how long before the subsequent wakeup commands it was issued. I found that when walking away from my car for an hour and a half, it did not log any wakeup commands on the CANbus. However, when I locked the car and walked away for 20 minutes, I came back to find a wakeup command had been logged 5 minutes before I returned to the car, and it had been sent by either the CAS module or the KBM. CAS had logged a wakeup command sent 5 minutes and 33 seconds before I returned to the car, but KBM just had "unknown" in the data field next to it. Next step is trying removing those modules one at a time and seeing if removing either one stops the draw and waking issue.

Wish me luck!

 

Lucky you have access to that feature.

 

After many weeks of wild goose chase, I solved the problem. It was twofold, one being that the battery I had installed was of a much larger capacity than what the car was coded for, so I remedied that. The major thing however, was my alternator. I had repeated fault codes for BSD bus missing alternator signal. I removed the alternator, took the voltage regulator off, and found that the contacts where the vreg communicated with the alternator body were badly corroded. I cleaned the contacts on the regulator and alternator, added some dielectric grease, and reassembled everything. Since then I have not had the battery die despite leaving it parked in my garage for a week and a half, and I have not had any recurrence of the alternator signal missing fault. In my specific case, it seems as though both things I changed were working in tandem to not charge my battery sufficiently.

 

I wouldn't necessarily say your electrical issue was 2 fold because not programming the new battery has nothing to do with a drain nor an alternator issue. If your alternator was working correctly you wouldn't have even noticed your car was programmed for a smaller battery. Either way glad you figured it out and got back on the road