Issue: The customer comes to the store stating that all instrument warning lights are illuminated (as shown in Figure 1), yet the car drives normally.Figure 1 Instrument warning panel (showing all lights on)Model: E66, equipped with M54 engine and 6HP-19 transmission.Driving mileage: 98281 milesDiagnosis: Use ISID to detect fault codes and found the following:CDAB, A389, E107, 5EFE, 5142, A383, A3AA, 9328, 51B9, D707, E287 According to the above fault code analysis, there are several possible causes: ①Damage to multiple control modules or short circuits within a single control module; ②The K-CAN bus system is open or short-circuited; ③Incorrect bus voltage.Moving...

Model: E70, equipped with a 3.0L engine.  VIN: WBAFE4105AL××××××.  Mileage: 84380 miles  Issues:  The customer reported that the two front headlights were always on and could not be turned off, and the turn signal could not be turned on. In addition, none of the windows could be raised or lowered, and the driver window control switch was inoperable.  Diagnosis:   The screen displays prompts to repair the lighting system.  In the test, it was also found that in addition to the malfunctions reported by the customer, the front fog lamp switch failed. After checking all related fuses in the vehicle’s fuse...