I have a Pioneer Premier DEH-P550MP that I bought in Feb 2004 for my previous car. I used it in that car until about a year ago when I installed it into my girl's mom's 92 Sentra that my girl was driving. When we returned her mom's car, I took out the Pioneer and installed the stock Nissan stereo. At that time, right before I removed it from the Nissan, I noticed that the right front and left rear speakers weren't producing any sound. So I just went to install the Pioneer head unit in my WRX tonight and it works fine, except for the same speaker problem; no front right or rear left speakers.
What gives? Is the head unit trash? Easy fix? Needs a service dept? Let me know what you think!