so your cd changer doesn't work when you try to use it fro mthe H/U? if your cd changer works, you have that connector. take some pix. my didn't come with a changer and it was tucked behind a coil of wires be the quarter panel on the driver's side. it was also wrapped in this foam sleeve

 

mine was prewired for a changer, and ive seen the cable and played with it... but i dont have a changer.