How important is the bus connection to the radio? Is it just so the radio can display information somewhere else on the dashboard, for the steering wheel controls, or so that information can be displayed on the radio? I can't see it as being absolutely necessary for the operation of the vehicle that the radio is connected to the bus (probably CAN bus being a BMW), but maybe a few nice features wouldn't work. It would be nice to have a few more details. Maybe we can figure out a workaround for some of these vehicles. The empeg does have a serial port afterall, and I'm sure you can get serial to CAN bus converters (I know you can definitely get USB to CAN converters) ... Derek (aus Duisburg)

(list 6284, Mk1 S/N 00299 4GB blue [for sale]. Mk2 S/N 080000094 6GB blue)
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)