I added audio control buttons to a 2009 V50. The harness inside the wheel wasn't correct, it didn't have the extra wires needed but the steering wheel electronic module was, it is needed for the horn. Once the wiring harness was changed and buttons were fitted they worked.
Adding the buttons gives an error in VIDA, this is because the exact spec buttons for the car have been discontinued and although the replacements work they generate an error code. Weird but as I said they work.
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