[rorschach]

It works if you have a working CD-changer in the trunk.

 

[rorschach]

Yes, you need a working CD-changer to send information to the head unit to fool it into thinking that's where the audio is coming from.

 

[rorschach]

From any electronics store, but I already had everything in my closet. All you need is a FDD cable and an audio cable with a 3.5mm headphone jack in one end.

 

[rorschach]

I can connect the the cable without connecting up the CD changer to the other end and I get full, proper sound from my MP3 players. Weird huh?

That's perfectly normal. The small 10-pin connector is *just* for sound from the changer, the control signals that are needed to fool the HU come through the larger harness at the back of the HU.