[TX '90 ZR1]

Did not get to spend a lot of time on it today.
Here's what I did accomplish.
Checked ECM codes and am getting a #46 which refers to the pass key just like the #53 on the CCM. This tells me the issue is definitely in the VATS system?
Tried second ingnition key, but still same result.
Will try to get time over the weekend to figure out the additional troubleshooting steps in the FSM.
I'll post what I find, but still open for suggestions.