故障现象一辆长安铃木雨燕SC7150手动挡轿车,累计行驶约1.3万km,行驶过程中出现组合仪表里程表显示屏没有背景照明,驻车制动警告灯和车门开关指示灯不亮,电子转向警告灯点亮,开小灯开关后,车身灯光正常但组合仪表无背景灯(图1),而且电子转向助力不起作用;打开大功率用电设备,如将暖风打到最大风速或开前照灯、操作升 Symptom A Changan Suzuki Swift SC7150 manual transmission sedan, a total of about 13,000 km traveling, there is no instrument panel display odometer display, parking brake warning light and door switch light does not shine, electronic steering warning Turn on the light, turn on the small light switch, the body light is normal, but the combination instrument has no background light (Figure 1), and the electronic power steering does not work; turn on the high-power electrical equipment such as warm air hit the maximum wind speed or open Lighting, operating l