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So you still have the 3 pin ibus connected to the changer and the changer has at least one CD in it to play? You'll need something to fool it that the changer is there with an audio disc or it will skip it (or at least not play). Ultimately your software could/should emulate the changer on the Ibus.

What about using the Auxiliary interface instead? The solution I linked to above originally came configured for the CD changer input but I moved it over to Auxiliary to keep the CD changer functioning (not that I have ever used it!). There are a number of DIYs to add auxiliary input on later models at the display unit.

Pin numbering looks good to me.
 
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