Can you add a picture of what the lip looks like, or lmk if you are able to tell it was swapped? I’m confident that mine came from factory with it because nothing looks tampered with. Im most likely wrong but thats j what I think. Did you have to dremel a hole? By looking at the pics under the trunk liner above are you able to tell if they wired it themselves similar to what you did? Sorry for so many questions lol

 

I'd have to dig into FSM but might want to see what codes come up with diagnostics. My pictures from back then are long gone.

Looking back at my nearly 15 year old post

https://g35driver.com/forums/g35-sed...ml#post2441526

"Pressing Setting button and turn radio volume 40 clicks either way. Radio must be off."

 

My lip is OEM.

You're better off rewiring it.