The car controllers are connected to the CAN Bus (Controller Area Network) and through this network, the transmission of work data and other parameters that the modules share with each other is processed. Each module has stored messages that are required at the time of communication, which are constantly monitored. When a receiving controller receives such a message, it checks that the transmitting controller is available.
The communication networks are HEV High-Speed Controller Area Network (HS-CAN), High-Speed Controller Area Network (HS-CAN), Medium Speed Controller Area Network (MS-CAN), and Infotainment Controller Area Network (I-CAN). If the High-Speed Controller Area Network (HS-CAN) is malfunctioning at any given time, the DTC U0004 OBDII will be set.