[tk1138]

I'm trying to map all the IO for adapting to aftermarket head units. I'm installing a Pioneer, but depending on how the Kenwood units due in march perform, I'll install one of those. If I can, I want to avoid splicing into the factory wiring.
Anyway, I started a spreadsheet (I'm an engineer...), but forums don't like tables, so below is a png of what I've been able to dig up so far. Please let me know if you know what any questioned signals are, or see errors. The perspective is facing into the existing wiring, or looking at the back of the new connectors / away from the radio, which is not quite canonical, but should make it easier to wire up connectors.

I got some good feedback via PM, and did some scoping of the mic signals, so the table has been updated.

The mic signal on an AVH-X5700BHS appeared to be unamplified condenser signal with a DC bias of ~1.4V, which only came on when the microphone would be used. The audio signal was low, maybe .1Vpp for loud noises.