Bought an 04 a few months ago, and the rear speakers don't work. Radio and front speakers work just fine. Checked the connections and all looks well.This is my first 350, not to mention my first Nissan. Need some help, can't get any locally. Thanks!

 

The no-Bose audio is simple: just a head unit and speakers. I assume that the head unit output for the rear speakers is dead. Only way to check head unit signal-no signal is:

With an oscilloscope
Test by connecting speakers directly to back of head unit.