KWILB Posted July 22 Share Posted July 22 Hello, I recently purchased a 2009 e90 330d msport. However, I have encountered an issue with the battery draining and eventually dying. I have already replaced the battery, but the problem persists. I have checked the crankshaft pulley and it seems to be in good condition. Additionally, I have accessed the hidden menu on the dashboard and observed that the alternator voltage is at 14v. It is quite perplexing because the car can run for a few days after a jump start, but then it dies again. Prior to the car dying, all the warning lights on the dashboard illuminate. I would greatly appreciate any insights or suggestions, as I am not knowledgeable about these matters. Quote Link to comment Share on other sites More sharing options...
Needsnewtyres2 Posted July 22 Share Posted July 22 There may be a brief circuit someplace. Are there any codes available? What is the voltage of the battery? Do the E90s not possess an intelligent battery sensor? The device may not be entering sleep mode properly, as it sometimes wakes up, runs a check, and then returns to sleep mode. The little red lead is linked to the negative terminal of the battery. Quote Link to comment Share on other sites More sharing options...
Needsnewtyres2 Posted July 22 Share Posted July 22 May assist you Quote Link to comment Share on other sites More sharing options...
KWILB Posted July 22 Author Share Posted July 22 If there are no error messages, I am uncertain about the battery voltage, albeit it is a fresh battery. There is a red component like a fuse box located on top of the battery. If the connection has been tested and seems to be functioning properly, it is possible that there is a short circuit somewhere. Quote Link to comment Share on other sites More sharing options...
NevoBMW320i Posted July 22 Share Posted July 22 It is necessary to verify whether the electrical systems of your automobile enter a state of 'sleep mode' within a time frame of 10 to 15 minutes after the car is locked. You may own an object that consistently consumes energy. Occasionally, it is features such as power seats that are responsible. Another potential issue might be the alarm system. Typically, the internal rechargeable battery tends to fail after a few years, causing it to use more power than necessary. Identifying the exact reason might be a tedious process that involves removing fuses and using an ammeter to monitor the battery depletion. The ammeter should be connected in series with either the positive or negative battery connection. If the auto systems experience a shutdown, the power drain should be below 30mA. If the power drain remains excessive, begin removing fuses until you identify the problematic circuit. Quote Link to comment Share on other sites More sharing options...
KWILB Posted July 22 Author Share Posted July 22 If there is a power drain in the car, would it result in the car being completely without power by the time I attempt to start it? Currently, the car starts up normally and functions properly, but suddenly dies after a few days. I am able to jump-start it for approximately 3 minutes, and then it runs for about 5 days before dying again. Earlier, it died but started up normally after a short period of time. Quote Link to comment Share on other sites More sharing options...
NevoBMW320i Posted July 22 Share Posted July 22 To get the most accurate information, it is recommended to connect an ammeter in series with the battery. This will provide you with information on current events and their respective timings. The problem may occur sporadically. If not, then you may have a defective alternator (which is intermittent) or a defective battery. There are few additional options available. Quote Link to comment Share on other sites More sharing options...
Needsnewtyres2 Posted July 22 Share Posted July 22 Indeed, the described behaviour does seem to be indicative of high power consumption. However, without specific details on the battery voltage, it is difficult to provide a definitive assessment. Upon scanning, one would see an electrical code, such as the occurrence of 3EED while my dashcam is in park mode. After leaving it alone for a week, I received a notification indicating that the battery level was low. There are many objects that are intended to enter sleep mode, as Arnie explained. If it fails to do so, it will gradually deplete the battery. The speed at which the item operates is determined by its power consumption. An 80Ah battery has a capacity to provide a current of 80A for one hour, 8A for 10 hours, or 800mA for 100 hours. Quote Link to comment Share on other sites More sharing options...
KWILB Posted July 22 Author Share Posted July 22 I have seen that it has two sets of aftermarket LED headlights and peculiar power boxes secured with wire ties in the engine compartment. Perhaps these components are related. Quote Link to comment Share on other sites More sharing options...
Needsnewtyres2 Posted July 22 Share Posted July 22 LED headlights are not likely to be the culprit, since they use less power than Halogen or HID headlights. If HID lights have been installed, the power boxes might serve as ballast. Quote Link to comment Share on other sites More sharing options...
KWILB Posted July 22 Author Share Posted July 22 I have an appointment with a BMW expert on Thursday, and I hope they are knowledgeable about the specific issues I am experiencing. It is somewhat difficult to drive without knowing when a breakdown can occur, which can be quite amusing in a somewhat ironic way. Quote Link to comment Share on other sites More sharing options...
QuirkyPixel Posted July 22 Share Posted July 22 In my assessment, I would attribute the issue to a malfunctioning alternator. Quote Link to comment Share on other sites More sharing options...
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