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General E46 Forum
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Old 05-18-2015, 08:06 PM   #1
McGrady
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Join Date: Dec 2013
Location: Ohio
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My Ride: 2004 M3 Coupe
Question: Parasitic drain, fuse 49?

Hey guys, car has been dying at night, when i leave the battery hooked up the driver side window slowly goes down over time. I checked the fuses and saw fuse 49 was creating the drain, which controls: Central Locking System, Anti-Theft System, and front window lifts.

I'm wondering what is actually causing the drain? Would it be the window regulator if the window slowly drops? There are no issues putting the window up or down, no noises, regular speed.

Any help would be greatly appreciated, thanks.

Car is an 04 m3 btw.
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Old 05-21-2015, 10:29 PM   #2
McGrady
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Old 05-22-2015, 12:40 AM   #3
scottjoh
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Location: Torrance, CA
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That's not a problem I've heard of before. Fuse 49 powers the CPU in the general module which is responsible for door locks, windows, wipers and a few other functions. When you say the driver side window slowly goes down over time what do you mean exactly? Literally the windows slowly creeps down over a period of time or you leave and when you come back the window is down or partially down? It's definitely not a window regulator and not the windows switches. The window switches are disabled after you take the key out of the ignition and open one of the doors. I don't see how this could happen. The general module may be bad and need to be replaced.
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Old 05-22-2015, 07:51 AM   #4
markusmarkus
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Check out www.bmwgm5.com for info.
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