The infotainment sub-system provides an interface for facilitating the interaction between humans and the automobile’s electronics.
This sub-system presents information acquired from sensors or ECUs as user-friendly and interactive to users for entertainment. Users’ mobile devices can also be hooked to the infotainment sub-system via Bluetooth, WiFi, or cellular networks. Moreover, as the infotainment sub-system controls different parts of the vehicle and displays their information, it can communicate with other sub-systems.
For example, some advanced infotainment systems can remotely diagnose vehicle problems by gathering diagnostic data from other sub-systems. As such, the infotainment system requires high bandwidth but is tolerant to delay on the scale of milliseconds.
Reference: In-Vehicle Networking: Protocols, Challenges, and Solutions by Jun Huang, Mingli Zhao, Yide Zhou, and Cong-Cong Xing