Quote:
As to an actual answer, check out PAC's OEM-1 and OEM-2.

This looks like exactly what you need. Heed the note there.


Well the url doesn't work anymore but I assume it's now this, and the note is thus:
"Not all Chryslers with an Infinity Sound Systems need an interface. When using this interface, if the sound is low but balances and fades correctly, you do not need this interface."

Well, my sound is low but it fades and balances correctly. Conveniently they offer no hint as to what I do want.