Just had my 2012 in for service at Melloy NIssan, Albuquerque, NM. Was experiencing 12volt battery discharge and after testing for a parasitic discharge overnight, this is what was done "Found TCM update per NNA for software update. Updated TCU -Verified proper operation of vehicle after service." My CARWings still doesn't work. I had the upgrade to 3G done back then and it worked until early 2019. I could use the app on my phone to turn on the heat! The app stopped connecting with the car. And the car cannot connect to Nissan. Since I'm now starting to drive more, it might be nice for this to work like it was supposed to. Since I've got 7 months before the 3G goes away.
After the upgrade I went into the CarWIngs screen and deleted then re-entered my username and password. The system could not connect to Nissan. I also noticed in the upper left corner of the screen the icon of a car with I think an antenna that was grayed out. I looked through the owners manual for the Nav system and no where could I find a picture of this icon nor an explanation of what it represents. Am I correct that it indicates the state of the TCM connection.
Thanks for any help.