关键词: 车载网络系统；CAN 总线；故障诊断；案例分析

Abstract: On-board network enables timely and efficient data exchange and information sharing among electronic control units on the vehicle, it is widely used and has a significant impact in the automotive field, and the troubleshooting of on-board network systems has become one of the skills that automotive maintenance personnel need to master. The article takes the Volkswagen Magotan B8 model as an example to introduce the basic structure of the controller area network (CAN) bus and local interconnect network (LIN) bus of the car's comfort system, and provides the fault diagnosis case. Based on the working principle and characteristics of the car's comfort bus system, the article analyzes and summarizes the troubleshooting ideas and methods, which can provide reference for automotive technicians to learn about in car networks, improve efficiency and quality in practical fault diagnosis.

Key words: On-board network system; CAN bus; Fault diagnosis; Case analysis