Ok, I've followed what I believed were the instructions for disabling the TCU so my 2015 Leaf would work properly with the OVMS. I believe in doing so, I'm running into some side-effects caused by canbus errors due to this.
First, I disabled the TCU by removing the large white connector. This successfully got the TCU off the bus and OVMS was able to do remote a/c and charge successfully. I've seen some strange things happening with the car since doing this: door lock/unlock doesn't always work, I've had charge sessions go crazy and keep restarting on their own. I was suspecting these strange things were related to removing the TCU from the bus, resulting in bus errors and problems with the various modules communicating properly. Pulling DTCs pretty much verfiied that, as I had bus errors for several systems including the brake system, ev/hev, hvac.
This prompted me to do some further searching, and I discovered a page on disconnecting the TCU, but completely unrelated to OVMS. This page indicated that if you remove the white connector, you will get a bunch or codes for bus errors. It instead recommended removing the grey connector on top, which will disable the TCU but not result in bus errors. I've tested this, and it will only result in a single DTC for the TCU not communicating over USB. The unfortunate part is the TCU does appear to be powered up and communicating on the bus. So while all the other parts of the car now appear to be working properly and not having bus errors, the OVMS can't start the remote a/c because the TCU is working on the bus.
Has anyone looked at what is needed to get the white connector removed without causing bus errors? I don't know enough about canbus to know if those pins would just need to be terminated properly, or if looking for a power wire to disconnect would turn off the TCU but allow the bus to work properly. Anyone tried either?