After installing Sync 3.4, I had an issue where when the Dual Climate mode was off, in Sync 3.4 the DUAL button was “On”. If I turned the Dual Climate mode on, the button on Sync 3.4 became disabled and the only way to turn dual climate off was via the physical button.
I was able to write a fix for this which I’ve posted on http://fmods.net/ and just wanted to post a pointer here for anyone else who may have this problem.
Without going into the whole JB thing (we do not discuss that here due to legal reasons), was the fix to remap the HMI parameters? I’m curious what is actually broken and if this is the same as the F-250 trucks of the same era. They have a similar issue with climate and Sync 3.4.