I have an '02 Porsche Carrera which had a CDR-220 with Hi-Fi sound package and factory CDC-3 Changer. I have installed a Traffic Pro II (the high speed model marketed under the Harmon Kardon brand in association with Ford accesories for their premium vehicles.) Problem 1 was it would not power up the factory Hi-Fi amp. Jumped the amp trigger off the antennae trigger to solve that. Fixed the alarm error with a properly placed piece of electrical tape. Last remaining problem is that it is not recognizing the cd changer. Do I assume there is an incompatibility issue witht he software version in the traffic pro II from Harmon Kardon and my cdc-3 changer? Or is ti just a change in wiring that needs to be made?? Thanks in advance.