pastulio

i took out the avic n3 and put in the stock head unit and the speakers work fine; I get sound both left and right. So that pretty much eliminates the speakers being the problem. I'm also pretty sure the wiring is not the problem either. So either there is a problem with my avic N3 unit itself, or there is some setting I can't find on the avic that is causing the problem. Any ideas as to what else might be causing the problem?

I installed the avic n3 and everything seems to work except that i'm only getting sound in the front right and rear right speakers. I double checked all the wiring and it is good. Any idea what might be wrong? Is there an option for mono or stereo sound somewhere? Any help appreciated, thanks!