pioneer z130bt probs

gvd

hi all, i have an issue with my newly installed z130bt that i hope you could help me with, specifically as it pertains to my iPhone4. when it's connected and i'm listening to mp3's and/or watching movies, i'm only getting audio from the left speakers. i fiddled with the fade/balance and when i move it all the way to the right there's no sound at all. my best guess (and hope) is that the installer goofed somehow and left the connector loose or something in the back of the unit. either that or the cord itself is faulty. if thats the case i can either replace the cord or firmly connect the cord and fix the problem, but if it's not that i'm afraid i may have to purchase another head unit. as an aside, i can play DVDs and listen to HD radio and i get perfect audio from both left and right speakers, so i'm pretty i can rule out faulty speaker connections. anyone else have this problem with this model, or even an older such as the z120bt etc.? i have a 2010 370 nismo, thanks in advance for your time.

gary