This case is similar to the one above, with the exception that the control module stays awake for too long. While the IBS is the most common cause of this problem, keep in mind that any device on the network can cause the same problem (wake up the locked vehicle). In the case of a faulty IBS sensor, the sensor itself will wake up other control modules so many times that they’ll drain the battery.Ĭonsequently, the clock will again reset because of the power cutoff. More common symptoms of faulty IBS are frequent wake-ups, and this brings us to the next possible cause.Īlmost any faulty control module, sensor, or actuator can cause unnecessary (and unwanted) wake-ups. The faulty IBS sensor can even prevent the engine from being started despite the good battery. In the case of 1-Series (E8x) and 3-Series (E9x), the moisture can cause the faulty IBS to send wrong messages on the state of the battery to DME. the battery is flat even though it is brand new and fully charged.) The early E6x and E9x models (up to 12/2006 production) are especially prone to this fault. Just like any digital device, if faulty, the IBS sensor can send the wrong message to the DME module (i.e. The “alternator fault” part means that the battery is not charged enough. After the message comes, the DME will initiate the procedure to save the energy for the engine start. If the battery is worn, the DME control unit will get the information on the weak state of the battery via the IBS (Intelligent Battery Sensor) located at the negative battery terminal. These are operational causes that can cause the power cutoff and thus the clock reset.
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