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Lorenzo,
Your diagram looks good and if your getting those resistance values from your steering wheel controls, your car should be compatible. However, as Izik said, the problem may lie in your game port. Apparently the USB adaptors may not be able to detect the resistance at the ohm level. I have neither confirmed nor denied this myself though. If possible, I would suggest trying a PCI based sound card with a game port as it's the only thing that I have confirmed works at the ohm level.
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