The short story:
Had the TCU (TCM?) upgrade completed on my 2013 Leaf. After the upgrade, I had to go into the carwings settings and log-in to the system again. This was easy as the log-in information was already stored, so I just had to hit the button. It went through some communication process, and from inside the car, I turned on the EV Connect app and was able to warm up the car. Yes!
The Long Story:
I originally took my car into the dealership in December (Future Nissan of Roseville) for a seatbelt issue, but also requested the upgrade of the TCU. They were super cool and gave me a free rental, yet the next day told me the TCU had already been upgraded. I was skeptical as I purchased this car in 2015 as a two year lease return. Regardless, they did not charge me for the new seatbelt (though they tried to blame it on my "I Can't Believe It's Not Leather" seat covers.
Naturally, in a couple weeks the EV Connect (Carwings) was not working. I tried several quick fixes before calling Nissan. The number on the Nissan Connect site was able to verify, by the TCU number, that it was not upgraded. So, back to the dealership I go. Fortunately, I work one mile away, so I schedule my appointments on days with no rain, and walk to work from the dealership. When I picked it up I was told it could take as long as 48 hrs to reset (whatever). The next day I tried to start the climate control but no dice. I followed the advice of someone who had posted in the comments section of an article about the TCU (see above) and it worked perfectly.
I know this topic has been beaten to death, but It is unfortunate that the Best Selling ev in the world has dealerships that know so little about the car. I am sure this may be different in bigger markets, such as LA and SF, but I hope that as evs become more common, this become less of an issue.
Still love the car!
Joined the 'Revolution" with my 2013 Pearl White SV. Love It!