There are two wiring harness/interface's you can use to keep factory sub, retained accessory power, etc.
Scosche FDSR
or
PAC C2R-FRD1
From what I can tell, they are the same thing, just different names.
I have purchased the FDSR myself, and I am trying to figure out how it makes the factory sub work. I was hoping somebody here could explain that to me.
This is the link to the wiring for the FDSR:
http://www.scosche.com/ecom/download/FDSR.pdf
Do I need to just plug the subwoofer RCA's, that are coming off the FDSR, into the aftermarket head unit??
The FDSR's instructions say that it provides a 5 volt regulated amp turn on for factory subwoofer....I just am not sure where that comes from.
Any help would be appreciated.
>>>>>EDIT<<<<<<
I have discovered the answer, for anybody else who may be severely over thinking this....like myself.
The 12 volt amp turn on from the aftermarket head unit (blue/white wire for my pioneer) connects to the blue/white amp turn on wire coming from the FDSR harness. The FDSR interface then converts the 12 volt signal to a constant 5 volt signal and sends it out to the amp/sub via the purple/green subwoofer RCA's coming off the FDSR harness.