I did have a Clarion wiring harness diagram, but I suspect it's on one of my computers which is currently in storage. But I know they're out there somewhere.
You can find installation guides (including wiring diagrams) on the Support section of Clarion's website. I couldn't find one with your specific model number but IIRC they're all pretty much the same (at least for their CD players). I don't know about Pioneer; never had one.
I know that's not a lot of information but at least now you know the information does exist somewhere.