I've got the same problem on my 03. I'm assuming you have the Midland/BMW CB located in the oddments box. Have you tried using the small 6 AA battery box to the CB to see if it works handheld off the bike? If that works you need to check for power at the + terminal on the CB adapter in the oddments box. Mine was reading 0. You'll have to pull the Stingray and look for the 8 pin DIN connector that connects the CB adapter and/or the GPS to the com system. Socket 8 in that connector is the power source. I checked mine and found it was good. That left the adapter unit as the suspect. I connected power to the connector pin 8 and still didn't get any reading through the adapter to the + terminal. That's where I am now, deciding if I want to send the adapter to Midland to see if they can repair or to look for another one. The BMW p/n for the whole harness with the adapter is 99 99 0 000 196 if that helps. Good luck.
There is not much to the harness and adapter the wires just route inside the adapter and solder to a terminal, before you buy a new one (if it is still available) I would recomend that you take the screws out of the adapter and check the solder joints.
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