The CD changer has a 3-pin plug that will connect directly to three of the four pins on Rolf's interface. The pins on the interface are labeled to help a little. The pin connections on the CD chagner plug are below. Basically, if you line-up Pin 3 on the CDC plug with the I-Bus pin on the interface, and you leave the forth "NTSC" pin unconnected on the interface, it will work.

CD changer pins:
Pin 1 Ground
Pin 2 Unswitched +12V
Pin 3 I-Bus

__________________
SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input