So, luckily I have a great Dealer (I never go to a dealer unless I need something special that I can't get anywhere else)
and the local senior tech mentioned that he had seen this behavior before, apparently it happens when a
non-cold weather HV battery gets installed into a car that has the cold weather package.
Still totally weird that installing a battery without battery heaters will cause the car to indefinitely charge the 12v battery to 14.4V
but that is what is happening.
Indeed, I had a warranty replacement 2017 battery with model nr 295B09RB9D in this car and swapped it with a 2011 battery with model nr 295B03NA0A. The car has cold weather package (steering wheel and seat warmers) and apparently this old battery is not the cold weather package type, so the car does wonky things. Now I need to find out how I can change it back to normal. Probably need to reprogram something in the LBC memory to make it think it has a cold weather package and everything is fine and to let the car sleep.
Hmmm, I can read and program the LBC, but where to find *what* exactly I need to write...
and the local senior tech mentioned that he had seen this behavior before, apparently it happens when a
non-cold weather HV battery gets installed into a car that has the cold weather package.
Still totally weird that installing a battery without battery heaters will cause the car to indefinitely charge the 12v battery to 14.4V
but that is what is happening.
Indeed, I had a warranty replacement 2017 battery with model nr 295B09RB9D in this car and swapped it with a 2011 battery with model nr 295B03NA0A. The car has cold weather package (steering wheel and seat warmers) and apparently this old battery is not the cold weather package type, so the car does wonky things. Now I need to find out how I can change it back to normal. Probably need to reprogram something in the LBC memory to make it think it has a cold weather package and everything is fine and to let the car sleep.
Hmmm, I can read and program the LBC, but where to find *what* exactly I need to write...