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If you have the B6 adapter you may be able to change the pins for your B5. AFAIK, the plugs are the same but the wiring is different. If you take the Symphony I wiring plan on your radio and compare it to the Symphony II plan, you should be able to figure out which pins need to be changed. You will need to extend the CAN-high and CAN-low as well as the v wire to your instrument cluster but all the other signals should be in the existing connectors.

Symphony I:


Symphony II:


RNS-E:
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You can only check plugs to see which wires are different. Your adapter is at least for a non-Bose system with CD changer. Look at the diagrams and locate the Symphony II CAN-HI wire, check your adapter on the radio side (black plug) and see if the wire is there. If not it may be a Symphony I adapter.
 
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