Ok, so far, I've hooked things up but not installed permanently due to a few issues. First, can't get the backup camera working, I have a rydeen duo with an RCA output and a red power cable that is supposed to get power when shifting into reverse. This worked on my stock BRZ HU with the help of SVXdc's harness. I hooked that power cable to the "Back" brown wire coming from the Ca-Fi's black harness and tried both the Reverse Video In and regular Video In with no image when shifting to reverse.
The other issue is the aux port, I'm getting audio, but it's very quiet and lacking depth. I looked at where the wires were hooking up to the AUX harness in the back and I used the blue/orange and blue/yellow pins for the white and red wires respectively and the blue/white pin for the ground (I also tried the orange for ground, no difference heard). I noticed, @
SHIFTER, you mentioned you tapped into the pink/green wire, not sure if it's different on the FR-S, but I didn't see the pink wire going to the AUX port. Maybe the AUX port just sounds like crap in general, I'll live with it. But really want to get the backup camera sorted out tonight.