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There are two aspects to the multifunction buttons:
1) The pictures on them. Doesn't mean anything. If your car is programmed to do next audio source and aircon recirc, and you plug a picture of a star/diamond in, it'll still do next audio source and aircon recirc. This changed in late 09 on the E92s with earlier models having star/diamond and ability to user preset the button
And the important bit
2) Whether the MF buttons are compatible with steering wheel paddles. If your car doesn't have steering wheel paddles from factory it's very unlikely you have the correct MF buttons needed. You will most likely need new MF buttons (and you can order them with aircon symbol, star/diamond symbol, even the M button symbol) as long as it has the extra cables required to run the steering wheel paddles.
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