CDR220, AUX requires CD in changer???

[NoGaBiker]

Hi guys,

I added a 2002 Turbo to the 2004 Boxster a few months ago and just got around to plugging in the cable in the back of the HU to replace the CD Changer cable. Read the instructions, all went well while the HU was out. Got it back in and then went into the menu and turned AUX "On" per instructions all over the internet.

But using the "S" button (source) I can toggle between CD, CDC, and FM, but AUX doesn't come up instead of CDC, as the instructions all say it should. When I put a CD in the first slot of the CDC, it now works perfectly (in other words, the iPhone plays as expected through the HU), which is fine, but the display still says CDC and Track 1.

I'm wondering why I can't get it to read AUX? I posted the same q in a thread on the subject in Rennlist 996 forum and all I got was a person saying they'd heard of that before and to search for it. Which I have for several days now.

Anyone know of this problem?

Thanks!