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Connectors (13-pin DIN) may be hard to come by(try ELFA) 
 
 
Or use single stranded copperwires that fits into the connector pins, and solder the audiocable 
to them: 

 

 
 
Use shielded cable only(shield is connected to ground-pin). 

Copper wire 
(insulated) 

Mute signal ;  
12volt from switch 

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