Battery Drain E90 335i

UncleRajeed · 02-26-2023, 03:12 PM

Hey guys I had a quick question. So I’m having an issue with my car that I just got if I leave the car for more than 24 hours turned off the car needs a jumpstart. So that battery is being drained. I’ve replaced the battery the issue still resides. I then took it to a mechanic which he then tested all the fuses, relays, and the main electronic systems and he said he didn’t find any issues. I checked all of the lights are off. He then said that it might be the headlights (since they are aftermarket) are interfering with the system. Any thoughts on this issue? Also the alternator was checked and it is fine.

Captain Buumer · 02-28-2023, 12:02 PM

Possibly some device in optical fiber loop is malfunctioning.

Some have had similar issue and ComBox or the other BMW crap modules in fiber loop just die.

UncleRajeed · 03-07-2023, 12:00 PM

Do you think it might be the EDC module? Because I just noticed that the start button light is on even when the car is locked and over night it was still on too.

02-26-2023, 03:12 PM	#1
UncleRajeed Registered 0 Rep 2 Posts Drives: BMW 2007 335i E90 Join Date: Feb 2023 Location: washington iTrader: (0) Garage List [0.00]	Battery Drain E90 335i Hey guys I had a quick question. So I’m having an issue with my car that I just got if I leave the car for more than 24 hours turned off the car needs a jumpstart. So that battery is being drained. I’ve replaced the battery the issue still resides. I then took it to a mechanic which he then tested all the fuses, relays, and the main electronic systems and he said he didn’t find any issues. I checked all of the lights are off. He then said that it might be the headlights (since they are aftermarket) are interfering with the system. Any thoughts on this issue? Also the alternator was checked and it is fine.
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02-28-2023, 12:02 PM	#2
Captain Buumer Second Lieutenant 126 Rep 246 Posts Drives: 325D Join Date: Jun 2018 Location: Europe iTrader: (0)	Possibly some device in optical fiber loop is malfunctioning. Some have had similar issue and ComBox or the other BMW crap modules in fiber loop just die.
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03-07-2023, 12:00 PM	#3
UncleRajeed Registered 0 Rep 2 Posts Drives: BMW 2007 335i E90 Join Date: Feb 2023 Location: washington iTrader: (0) Garage List [0.00]	Do you think it might be the EDC module? Because I just noticed that the start button light is on even when the car is locked and over night it was still on too.
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