I think fiberoptic is only for the cd changer. The wiring harness seems to have 8 line-level audio inputs, 5 control wires, and another 6 wires that are probably for the integrated phone that I'll never use.

A little more reading has revealed a hack: Connect the 12V constant power and the supposed 12V switched line to make the head unit turn on. That actually makes no sense if CAN controls the switching.

Or, better yet, find a switched line somewhere off the fusebox and connect that. But dimmer, amp remote, etc are still unknown. Though that blue/white cable sure looke like amp remote power to me...

I could try my local dealer, but I don't think I'll get much. Crutchfield and local audio installers won't touch the thing. I guess I'll have to replace the amps and speakers... I was really hoping for a quick drop-in headunit swap.