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MG,
I think this project has potential. I'm not too much into the electronics as far as the physical layer of the network, however it's very possible that the switch inputs from the radio are NOT available on the PCI bus. Double check first before you invest too much time and money that the radio switches are sent out across the vehicle's PCI bus. It's important to note that not all switches need to be sent out as signals on the bus. The only reason some of them are is because the information needs to be shared with another ECU or module on the vehicle network. So I would be surprised if the fast forward and rewind button presses are a part of the vehicle network. But I'm not familiar with this vehicle's network.
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