Anyone with stock HU and cd changer?

[Triften]

If anyone out there has an H250, H260, or H290 stereo with CD changer (or even a USA SPEC aftermarket) and can tell me how voltages on certain pins behave, I would be very grateful.

I'm trying to figure out what I need to do to fool the HU into letting me use the cd changer input as an Aux-In. I already tried dropping the voltage on pin 2 (CD ON) low via pin 5 (see www.hmaservice.com for pinouts) but that didn't work. Some cars require a pin to go high to switch over but before I shove 14V into these I'd like to get a little more info.

Thanks,
Triften