Here's a link to a discussion on the Becker Board. http://www.beckerautosound.com/beckerboard/viewtopic.php?t=66
You might also want to post your question there and get a definitive answer from one of the moderators.
I have a CDR 220 radio, and it was fairly easy to add an iPod. It sounds like the CDR 23 is a much more advanced system and more difficult to modify.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 12-way driver & 8-way passenger seats, Litronics, silver console
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