ISO 17356-4:2005（COM）规定了汽车控制单元（ECU）应用软件的统一通信环境。 在ISO 17356-4:2005中，本规范通过定义内部通信（ECU内的通信）和外部通信（联网车辆节点之间的通信）的通用软件通信接口和行为，增加了应用软件模块的可移植性，这与所使用的通信协议无关。

ISO 17356-4:2005 (COM) specifies a uniform communication environment for automotive control unit (ECU) application software. In ISO 17356-4:2005, the specification increases the portability of application software modules by defining common software communication interfaces and behaviours for internal communication (communication within an ECU) and external communication (communication between networked vehicle nodes), which is independent of the used communication protocol.