2009 ML350 Stereo Unit

My girlfriend has a 2009 ML350. The stereo unit quit working and I have tested what I believe to be all the fuses. I have been searching for a wiring diagram and/or schematic to test if there is power getting to the unit without possibly pulling the whole unit out. Is there any resources or guidance out there to help? Spike

My girlfriend has a 2009 ML350. The stereo unit quit working and I have tested what I believe to be all the fuses. I have been searching for a wiring diagram and/or schematic to test if there is power getting to the unit without possibly pulling the whole unit out. Is there any resources or guidance out there to help?
Spike

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