Most likely a fault in the amp in the unit or as it does work now and the a bad/loose speaker connection on the read of the dash unit.
You can test the speakers by holding down the three and six preset buttons until it enters test mode. If you hear no sound during that test, the head unit or cable are bad. I would pull the radio and double check the connections, then go from there.
Wednesday, July 12th, 2017 AT 8:48 PM