You missed a step:
- The car beeps
Well, that certainly helps to explain how it takes like a full minute to get a response. It would make sense if we could access it directly--although that would still entail a trip to T-Moblie, to AT&T, to the car, etc. But still.
Anyhow, I did disconnect the battery today, and it did bring Carwings back to life. So a big thanks to the group for finding that fix. For the record, I turned the car off for 5 minutes and then left it disconnected for 5 minutes. Carwings came back without my having to turn the car on.
Now, I wonder if it's practical to get at the telematics power connection without having to bring down the whole car. I took that little door off the glovebox but didn't see anything promising.
I also took the opportunity to measure the current drain from the accessory battery. Actually I was looking to measure the input from the "solar panel". I think I should find a more appropriate thread for that, or start one.