Head Unit or Wiring Toubleshooting

[Rooster Feather]

Last year I installed a JVC KD-X37MBS head unit and Polk Audio DB522 front and rear speakers in my 05 Jeep Wrangler. I used a wiring harness to connect the head unit to my factory wiring. The system worked well for several months. However, the rear speakers in my sound bar quit working correctly. They still make some noise but it is very weak and muffled. I can only hear them when a turn the fader all the way to the back. I disconnected them and reconnected them to the front speaker wiring and they worked perfectly. So I don't know if the rear wiring is faulty or if the head unit is not working properly. Is there a way to test the output on the speaker wire from the head unit or another way to determine what is going on?

Craig J

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