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故障现象一辆2009款途观车,累计行驶里程约为2.1万km。驾驶人反映该车在倒车时,倒车影像系统正常显示,但倒车辅助线时有时无。故障诊断接车后首先验证故障现象,发现该车确实存在车主所反映的问题,倒车时倒车影像系统能正常显示,但倒车辅助线时有时无,到后来就彻底消失了,如图1所示。接着查阅维修资料,得知上海大众途观车的倒车影像系统,通过选择倒挡就能启动倒车影像系统,同时显示屏上有3条线(图2):红色定向线①,它表示安全距离,即车后路面约距后保险杠40 cm;绿色定向线框②,它表示车辆向后延伸
Symptoms A 2009 road concept car, the cumulative mileage of about 21,000 km. The driver reflects the car in the reverse, the reverse imaging system is displayed normally, but sometimes when backing the auxiliary line. Fault diagnosis After the first car to verify the failure of the phenomenon and found that the car does reflect the existence of the owners of the problem, reversing the reverse imaging system can be displayed normally, but sometimes when the backup assistance without, and then completely disappeared, as shown in Figure 1 . Then access to maintenance information that Shanghai Volkswagen Tiguan reversing video system, reverse gear by selecting the reverse system can start, while the screen has three lines (Figure 2): red directional line ①, which said the safety distance, That is, the distance between the rear pavement of the car and the rear bumper 40 cm; green directional wire frame ②, which indicates that the vehicle extends backward