No worries! Thanks for the hint about the date -- I didn't know that was a function in the equation. Changing the date back to 2023 actually allowed the 19190301 code (had a typo in my original post) to work, though it seems they've removed the telematics switch unfortunately. Some day, I'll have to figure out how to disconnect the antenna.
That's disappointing - thanks for the info. I guess I'll continue to avoid infotainment updates. I can confirm that the telematics toggle is present (and functional) in the variant coding submenu on version 221025. I wonder what dealers are doing in Massachusetts now.
I think the antenna connectors are accessible if you remove the lower center console trim, then reach up behind the screen. But I haven't tried this, since the software toggle works for me.
