As I prepare to do the DIN-13 mod to my '04 6-disc stereo, I got to thinking (uh oh)...
How does an external CD changer (via the DIN 13 port) tell the head unit to "listen" for it's signal (music on CD)? If it's continuity, I could use a switching 3.5mm ♀ connector in the dash; this is the kind that typically used in boomboxes - the main speakers are switched off when headphones are plugged in.
The blank soundtrack CD is simple, but not quite perfect.
I think the switched plug would be better.
Driver carries no cash; 04 Forester XS