Well disregard the previous post - as is the radar detector will not work in the daytime lol! It only works when the nighttime ambient light is triggered.
Back to the drawing board. I removed the old setup and this time removed the entire overhead console - not just the panel. There are two T10 screws to remove:
Then there are two friction fit tabs up front that just pull straight down.
There is a main wiring harness to the overhead console on the left side that you can disconnect.
Testing all the wiring shows that the black wire is a good ground, and the leftmost purple wire with white stripe is a good 12v positve that directly is triggered by the ignition. Engine on, power on; engine off, power off.
Just an extra step but now all seems to work properly. I think the purple wire with white stripe is the power lead to the passenger airbag light on the overhead console.