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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-23-2013, 09:17 AM
Spikes007 Spikes007 is offline
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Dead battery after 2-3 days

I have a problem that I am not able to find where it's coming from. When I don't drive my car for 2 or 3 days, I'm not able to start the car because the battery has been drained. I have 3 leds on my car blinking while the car is not running. I don't see how this can be the problem but I'm looking for a way to test the electrics component to see where's the "leak" coming from.

By the way, the battery is 2 months old and I already did the battery test (from the dashboard) and it seems like everything is ok.
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  #2  
Old 03-23-2013, 12:18 PM
boltaction boltaction is offline
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So when you run the #9 obc test you are seeing 13.8-14, meaning your alternator is working?
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  #3  
Old 03-23-2013, 12:26 PM
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SJBimmer SJBimmer is offline
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YouTube will usually have what you need, you just have to search.

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  #4  
Old 03-23-2013, 01:29 PM
Spikes007 Spikes007 is offline
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Quote:
Originally Posted by boltaction View Post
So when you run the #9 obc test you are seeing 13.8-14, meaning your alternator is working?
Yes.

Quote:
Originally Posted by SJBimmer View Post
YouTube will usually have what you need, you just have to search.

Thank you for the link! I was trying to find something useful but I guess I didn't have the right keywords to do a proper search. I will definitely check that out next week-end!
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  #5  
Old 03-24-2013, 09:30 PM
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bluebee bluebee is offline
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This is meant to be instructive:
- One users experience diagnosing parasitic dead battery overnight current drain (1)
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  #6  
Old 03-25-2013, 08:14 PM
mofunk mofunk is offline
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I had the ac/heat blower drain my battery overnight and during the day. If that helps? Listen when you turn your car off.. if you hear the compartment fan going. My mechanic told me to unplug the battery overnight and the next day plug it back up.

idk if that's what you have ??
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  #7  
Old 03-26-2013, 07:44 AM
GoForthFast GoForthFast is offline
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Quote:
Originally Posted by bluebee View Post
This is meant to be instructive:
- One users experience diagnosing parasitic dead battery overnight current drain
Take a few of your posts and they are the equivalent of writing shop manuals for us gratis!
First, thanks so much for all you contribute.
Wonder how you find the time and dedication, and if you ever end up with time to drive your car.
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  #8  
Old 03-26-2013, 09:01 AM
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SJBimmer SJBimmer is offline
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Originally Posted by GoForthFast View Post
Take a few of your posts and they are the equivalent of writing shop manuals for us gratis!
First, thanks so much for all you contribute.
Wonder how you find the time and dedication, and if you ever end up with time to drive your car.
+1 on that! bluebee is awesome! She is probably driving more than the rest of us too!
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  #9  
Old 03-27-2013, 12:41 AM
ChipD95613 ChipD95613 is offline
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BMW has had to release 2 revisions of the Final Stage Resistor (or "blower motor resistor") due to this problem. If you do not have the most recent revision you will have this battery drain issue. Make sure to update yours. If you haven't, that is most likely the problem.
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  #10  
Old 03-27-2013, 03:27 AM
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bluebee bluebee is offline
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There is a huge thread on USENET alt.autos.bmw regarding the FSU this week:
- Root cause insight into the common BMW blower motor resistor failures

In addition, here's my detailed story looking for parasitic overnight battery drain:
- Recommended method to diagnose overnight parasitic battery current drain including the FSU (1)

See also:
- How to repair your own final stage resistor for free (1)

And, of course, you'll need this if you're gonna buy a new one:
- What is the right brand FSR to purchase (1)

Your job, now that I've done mine, is to improve the record, so that we move forward, repair by repair, on understanding and fixing the FSU.
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  #11  
Old 03-27-2013, 11:15 AM
2zzday 2zzday is offline
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I have this same problem. Did you ever find a solution?
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  #12  
Old 03-27-2013, 12:10 PM
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Originally Posted by sjbimmer View Post
+1 on that! Bluebee is awesome! She is probably drinking way more coffee than the rest of us too!
FIFY....
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  #13  
Old 03-27-2013, 12:43 PM
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FIFY....
Unfortunately, I have had to modify my opinion.

http://www.bimmerfest.com/forums/sho...7&postcount=25
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  #14  
Old 03-27-2013, 02:28 PM
2zzday 2zzday is offline
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Thank you, Chip. I'll have my mechanic look into that.
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  #15  
Old 04-05-2013, 07:17 AM
Spikes007 Spikes007 is offline
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I was supposed to do the tests but it was freezing cold this weekend (snowing) so I didn't. But all the symptoms seems to be from the Blower Motor Resistor. For about a year now, when I turn on my fans, the fan isn't regular. Also when I start the car in the morning, I always hear a "pop". I have no idea for how long because I never turn on my fans during summer. And yes I do hear the fan when I put my key in the ignition (without turning the car on). I ordered one and I'll replace it and I'll get the result in this thread. Hope this will fix my fan problem AND the draining battery.

Thank you for the links and tips!
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  #16  
Old 04-05-2013, 10:51 PM
GoForthFast GoForthFast is offline
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Very likely FSR will cure what ails you.
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  #17  
Old 04-06-2013, 01:07 PM
mofunk mofunk is offline
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Quote:
Originally Posted by Spikes007 View Post
I was supposed to do the tests but it was freezing cold this weekend (snowing) so I didn't. But all the symptoms seems to be from the Blower Motor Resistor. For about a year now, when I turn on my fans, the fan isn't regular. Also when I start the car in the morning, I always hear a "pop". I have no idea for how long because I never turn on my fans during summer. And yes I do hear the fan when I put my key in the ignition (without turning the car on). I ordered one and I'll replace it and I'll get the result in this thread. Hope this will fix my fan problem AND the draining battery.

Thank you for the links and tips!

So I was right. Actually my mechanic diagnose that on my old bimmer. I remember going to work and my car was fine. What I didn't pay attention to was when I went to my car at lunch time and the key remote didn't work. It was working fine when I parked the car. When I came back 3hrs later It wouldn't open with the key. I shook it off at my key have an bad day.

While I saved up to have it installed, I kept unplugging the battery until I had the funds. Its ironic that after my car was totaled I found another Bimmer that's on the early stage of the same symptoms. Luckily the summer is coming. I' do have an extra resister from my last car (long story).

Get it fixed. Trust me you don't want to have no heat in your car in the winter time. Blankets don't help when it's 20 outside lol
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  #18  
Old 04-06-2013, 03:26 PM
GoForthFast GoForthFast is offline
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I kept unplugging the battery until I had the funds. l
Alternatively, next time you could just pull the blower motor fuses overnight.
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  #19  
Old 04-06-2013, 04:47 PM
mofunk mofunk is offline
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Oh sweet. Didn't think about that.
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  #20  
Old 05-21-2013, 08:14 AM
Spikes007 Spikes007 is offline
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I know it's an old thread but just wanted to post to confirm it worked for future reference.

Changed the FSU last week and it seems to have fixed the problem. Didn't drive the car for 3 days and I didn't have any issue starting the car yesterday. Also the DIY was easier than I thought. Took me 1h (stopped several times to check DIY videos).

Thanks again!
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  #21  
Old 05-23-2013, 03:23 PM
2zzday 2zzday is offline
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Dead battery after 2-3 days

Got the resistor replaced and have had no further issues with phantom battery drain. Thanks to everyone on the thread who pointed me to this solution.


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