I'm having a problem too, I know this is an old post but I'm using the metra harness and I don't know where the rca connections go. Do I only use two of them? If someone could please tell me how I get the rear speakers to work properly using this I would be very grateful

 

Have a read through this post

https://www.audiforums.com/forum/b5-...new-hu-165821/
and this post
https://www.audiforums.com/forum/b5-...oblems-165558/

If you have specific questions after that, post them up. Good luck.

Doug