Well, Pacific Parts finally sent me my service manual. Here are the pinouts for the DIN:


And Molex type ports:



Any ideas on how this works? It states in the manual that the DIN input goes to a cd controller IC and then to the volume controller. It doesn't say anything about how to allow throughput on the speaker channels. I tried just running the sound in, but this doesn't work. There has to be some kind of input from the source that tells the head unit to let the sound through.