After a lot of shearch on the web, i managed to understand nothing. So i am asking you guys: i have a laguna 3, with an original radio unit, wich has a type c connector(with an can low and can high pins conection). The problem is that those pins are already used for a CAN unit, don't know wich one). From what i know, the can bus network work in node system. So it would be possible to connect the arduino shield to the network from the radio pins? I attached a diagram below.
