I may be the wrong one to ask because I like to DIY but I failed miserably with this radio.
I did everything I knew of - tried two harnesses, swapped speaker A for B, took apart a harness and retightened everything, etc. I got no love from that radio so I finally went back to the dealer.
If that's inconvenient, they can send you a new radio and you install, but I would go through your dealer for that.