This is the BMW E90,E91,E81,E87 steering wheel controls connector, this connector is connected to the clock spring in the steering wheel, and the signal wires go to the control box. You can get the signal wires after the clock spring. Because the signals(Right Signal, Left Signal) are resistive, they can be connected to CarPC JoyCon Exr(Ex) channels directly.
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How to use BMW E90,E91,E81,E87 steering wheel controls for Car PC