You have plugged the i-bus interface into the cd connecter, right.

What version of windoze do you have, as the usb i-bus requires a special driver for some versions.

http://www.reslers.de/IBUS/install.html

Here is a page to help setup the USB port on windoze XP

http://www.reslers.de/IBUS/port.html

Also, 1st stage ignition should be enough to use the i-bus interface.

Hope this helps

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52, 330ci Sport, Topaz Blue. Reto-fits: Mk4 DVD Drive, OEM Bluetooth, VR Control, OEM LED's, Folding Mirrors, Focal Speaker Upgrade, Sony SOT Amp, CCFL, Intravee II