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General E46 Forum
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Old 10-02-2010, 05:15 PM   #1
Keith Billanti
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Windows go down- all by themselves.

Yes- i have searched. I have read a lot of threads. None of them seem to ever have a definitive closing- where we know 100% that the problem was fixed. LOL Or at least it seems.

I have a 2004 M3- 87k on it.. and for the last few weeks- I have been enjoying coming out to a car with open windows/roof and doors unlocked. Today- my car had the audacity to do it in front of me- repeatedly.

After cursing the car out- pleading.. WHY OH WHY.. I TREAT YOU LIKE GOLD>>> WHY DO YOU DO THIS?? I finally pulled fuse 49 and walked away. I have no power windows or door locks now.

I read SOMEwhere- that this could be a bad connection at the door/frame? where moisture is getting in, causing a short.

I have read door actuator

I have read remote antenna

I have read leaky windshield seal


I am not a millionaire- I dont have money to throw at this right now.. is there anyone out there with some valid input on this (its not me holding my FOB button)

thanks guys
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Old 10-02-2010, 05:36 PM   #2
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I had a friend with a 2004 Imola Red M3. He was super-fanatical about his car. Always garaged, rarely saw rain. Only had 4,200 miles after 3 years of ownership. If weather looked bad he drove his E-series merc to work.

His did the same thing about 9 months into ownership. I seriously, seriously doubt it was water anywhere in the car. He took it to the dealership and they reflashed his DME, and replaced his central locking switch. It never happened again.

That might be it, but you never really know with electrical gremlins like this.

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Old 10-02-2010, 05:39 PM   #3
Keith Billanti
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right on- I have also read that heat/cold could have something to do with this..

this is not a fun time.
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Old 10-03-2010, 10:46 PM   #4
Keith Billanti
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No one else?
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Old 10-03-2010, 11:11 PM   #5
BusaNoob
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The simplest cheapest thing would be unplug the battery for hour or so. Maybe that will clear something out of the ecu. Otherwise off to the stealer !
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Old 10-04-2010, 06:31 AM   #6
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Drivers door lock actuator needs to be replaced.

Should be item #1 in this link - http://www.realoem.com/bmw/showparts...54&hg=41&fg=40

See this thread as well, look closely at the last few posts - http://forum.e46fanatics.com/showthr...t=windows+open

There are only 2 things that can control the windows/top/sunroof and doors when the car is off, the driver door lock actuator and the keyfob. The keyfob had too many steps before the signal is sent to the GM5 module, the drivers door lock actuator is subject to a lot dust, moisture, shock and vibration.

I also think if you tend to use the door lock to open and close the windows/top/sunroof often, you are more likely to have issues with the actuator??
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Old 10-04-2010, 05:01 PM   #7
Keith Billanti
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Thanks for the replies guys. I actually did some wrenching today as I cant drive around without the fuse in (no wipers).

I disconnected the plug at the door/body= went for a drive. No problems. No window though.

I then tore the door down and disconnected the actuator. Still no problem, but at least I have window functionality.

Ill be ordering the actuator momentarily. Might email one of the guys parting a car out first though as there was a car with 30k on it being parted out. If it is cost effective, ill go that route.

thanks for the input!


this car sure would suck If i couldnt turn a wrench. (i sure dont have the deepest pockets)
KB
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Old 10-04-2010, 05:19 PM   #8
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It's caused by a cracked windowshield cowl cover allowing water to go where it shouldn't.

Here is a DIY http://forum.e46fanatics.com/showthread.php?t=373451

Part number 51718208483. Cost is $47.13 plus shipping from getbmwparts.com

Last edited by scottjoh; 10-04-2010 at 05:25 PM.
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Old 10-04-2010, 05:21 PM   #9
Keith Billanti
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which part is this?
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Old 10-04-2010, 05:21 PM   #10
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I think you have a bad key fob. It intermittantly transmits a continuous unlock signal which causes all the doors to unlock and the windows to open.
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Old 10-04-2010, 05:24 PM   #11
Keith Billanti
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Actually- as per 2 posts up= i have isolated the problem to the actuator- just as most of the other threads as well as a post or two in here have alluded to.

Part ordered- 106.00 from tischer.
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Old 10-04-2010, 05:25 PM   #12
mal1110
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theres nothing worse than loving something and caring for it and having it crap all over you
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Old 10-04-2010, 05:26 PM   #13
Keith Billanti
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Quote:
Originally Posted by mal1110 View Post
theres nothing worse than loving something and caring for it and having it crap all over you

so true.
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Old 10-04-2010, 06:05 PM   #14
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Disregard my two earlier posts. I was just being a dick because cowl cover and bad key had not been mentioned yet.

To recap. Reflash DME, central locking button, unplug battery for an hour, door lock actuator, cowl cover and bad key fob.

I strongly believe that the culprit is the driver's door - door lock actuator. And that is because I believe the hall effect device which senses the position of the lock in the actuator is going bad and falsely sensing that the lock cylinder is turned. Not because of dust and moisture because that assembly is very well sealed as is the connector.

One more thing. If your door lock key cylinder is broken (lock turns 180 degrees with no resistance) then replace that first and only replace the actuator if the doors and windows open by themselve again. This is because lock position sensor is probably not in the correct position, but, turned partially to unlock.
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Old 10-04-2010, 06:27 PM   #15
Keith Billanti
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Nope= (knock on wood) lock cylinder appears to work properly. Thats how i am locking my door right now.

My wind shield cowl-- could use a replacing. I will likely do that shortley.

Kicking my self as I just remembered that I wanted to order a new temp sensor as well. Damnit.
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Old 10-05-2010, 12:03 AM   #16
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I had this exact same problem. Cost me $200 bucks for parts and labor from a mechanic specializing in BMWs, not a dealership. It was caused from me pulling my door panel off to put in new speakers and not correctly installing the door panel. It started off by locking... whining... unlocking it self 10 seconds later. Then 5 minutes pass, windows go down. Depending on the cars mood, this time was sometimes 20 minutes after leaving the car, the windows go down. I kind of ignored it for a long time and then wintertime hit, I had just gotten out of school, walked out to my car. 1 inch of snow on the seats and ice on the inside of the windshield (which by the way is not easy to get off with an ice scraper because of the curve of the scraper). I was livid having spent 20 minutes trying to get the ice and snow out of my car! I thought it was the key at first, and ordered a new one. That didn't work. So I unplugged the window buttons, hoping that would help... but nope. they rolled down after 3-5 minutes and had to plug the buttons in again to get them up. At this point I didn't know what todo, so I took it to a mechanic, he told me exactly what the problem was and fixed it when the actuator came in 3 days later. No problems whatsoever now.

Sorry for the novel, just thought I would share, as this is kind of an important topic where so many things can go wrong.
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