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I have a 2007 9-3 where recently the radio would stop playing music/sound for a period of time and then randomly kick back on; all the while the head unit remained powered on. Same problem for CD's and AUX.
Important things to note

  • Blinker indicator noise still works
  • I know for 2007- and above they put the amp in the back trunk, and the blinker sound is stored in a different side panel.
  • A little research suggests fuses 25,3, and 14 could be at fault, but will check these a little later.

Any thoughts as to where I should begin, or if anyone had a similar issue? I have a feeling there's a loose wire in back of the head unit which I could take a look at as well.

Thx
 

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Possibly the mute wire? I'm not sure what the mute signal is but if it's by grounding that pin at the head unit, it could be a short in that wire. The head unit (at least up through '06) generates all the notification sounds even when muted, so that would make sense.
 
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