Following the huge problems with high current usage when car is not in use (that means that it didnt go to sleep mode fully, not that it has a high sleep mode current) with the 7 series E65 and early 5 series E60, BMW implemented some extra functions. If the car was supposed to be in sleep mode, but it continues to draw high current, most of the consumers will be shut down and only a few will be left "armed", CAS and a few others. This function will prevent the battery to be drained completely, but it may stay at a low level of charge without giving some noticeable clues for the regular owner. With DIS and ISTA an "Energy Diagnosis" menu can be accessed where all random wake-ups and other energy related events are recorded.