OPERATION
In very rare case, an exception that the camera image calculation is impossible is detected by the self-diagnosis function of the FCM/LDW/AHB-ECU. In this case, the FCM/LDW/AHB-ECU stops its function temporarily and resets itself internally. As a result, if the FCM/LDW/AHB-ECU judges that there is no problem, it resumes the function as normal. At this time, DTC No. C1809 is set as a history, but it is not necessary to replace the FCM/LDW/AHB-ECU because this is not a malfunction. When there is a problem left after the internal reset, the FCM/LDW/AHB-ECU stops its function and DTC No. C1751 is set.