故障现象一辆2016年产的一汽丰田拉罗拉车,搭载9NR-FE发动机,累计行驶里程约为8 000 km,因车内照明灯不亮而进厂检修。故障诊断接车后首先上车验证故障现象,关闭4个车门,接通点火开关,起动发动机,发动机顺利起动。接通车内照明灯总开关(图1),车内照明灯均不亮;断开车内照明灯总开关,依次接通左侧、右侧车内照明灯开关,左侧、右侧车内照明灯均不亮;接通车内照明灯门控 Fault phenomenon A 2016 FAW Toyota LaRola car, equipped with 9NR-FE engine, the cumulative mileage of about 8 000 km, due to the car lighting is not bright and into the factory overhaul. Troubleshooting After the first car on the train to verify the fault phenomenon, turn off the four doors, turn on the ignition switch, start the engine, the engine started smoothly. Turn on the car light switch (Figure 1), the car lights are not bright; disconnect the car light switch, turn on the left and right car lights switch, the left and right car Internal lights are not bright; turn on the car light gated