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Failure phenomenon: a BMW X1 in 2012, driving a mileage of about 41 thousand kilometers, the owner described the car as long as the vehicle is exposed to the sun, the fault will appear, when the fault occurs, the middle lock, the skylight and the rain wiper are not working (the window is normal); the instrument DSC alarm, the tire pressure alarm, the airbag alarm, and the CID vehicle information Inside the vehicle maintenance information all bright yellow light; failure occurs when the instrument intermittently does not work (tachometer, speed meter, oil meter to zero), CID black screen; failure occurs when the engine is normal start.