drrkholmes

A couple of weeks ago, I bought a 2010 GL 450 and noticed the following problems with my iPhone 4s. When I plug into media interface to play any music, sound comes out of only passenger's side front and rear speakers, nothing out of driver's side. I tried my wife's same exact phone, no sound out of any speaker's at all.
So, I called the dealer and they gave me a new media interface cord to try...same issues.
So, I scheduled an appointment at their service center. The service manager also has an iPhone 4s. He plugs his in and plays crystal clear through all of the car's speakers, sends me on my way.
But, my problems are still the same.
Any ideas????
Thank you!