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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-16-2010, 10:11 AM
scweaver01 scweaver01 is offline
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Location: Cleveland, OH
 
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Mein Auto: 2002 525i
Angry Battery pulling current from where?????

Someone please chime in. I have an 02 525i. Have had constant prob's w battery dying. Had battery fully charged and inspected and is fine. My mechanic who specializes in repairing bmw's has had car for wk now and can't pinpoint where it is pulling current from. Have only had car for 3mo now and am about to lose my mind. Was sold as is, no warranty involved. Our mechanic said this was a "common" prob for this model and am wondering if anyone else has come across this very frustrating issue. Hate to take it to main BMW dealership bc will cost a fortune!!!! Any ideas??? Thank you very much.
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  #2  
Old 01-16-2010, 10:42 AM
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bmw_n00b13 bmw_n00b13 is offline
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The FSU and DVD-changer are common sources of battery drains. I don't think that a competent mechanic would be unable to locate the draw after a week.
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  #3  
Old 01-16-2010, 10:49 AM
BillP BillP is offline
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I would just replace the FSU and see if that fixes it. It'll be cheaper than more diagnosing and there is a 50+% chance that is it.


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  #4  
Old 01-16-2010, 12:16 PM
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flyboyy flyboyy is offline
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what if you just unplug the FSU.. and see if battery drain persists... if after pulling the FSU... battery still drains..its obvious.its not the problem...

dont just throw your money away... instead troubleshoot it.
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  #5  
Old 01-16-2010, 07:08 PM
scweaver01 scweaver01 is offline
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My apologies...our mechanic has already replaced the FSU. Also have a CD player but no disk changer....any other ideas? The car is pulling 5milli amps off and on and hard to catch it in the act to pinpoint. Mechanic said something about could be something smaller like hood/trunk switch... After car goes to sleep, it occasionally will be "woken up" from something and no telling when this could be.
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  #6  
Old 01-16-2010, 07:13 PM
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dalekressin dalekressin is offline
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Check for freyed trunk wires that travel from the body to the trunk lid. Look inside wire harness (tube). You are likely to see a real surprise!
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  #7  
Old 01-16-2010, 07:38 PM
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mnepitjr mnepitjr is offline
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Just because a battery has been recharged and tested, it doesn't mean that it's good. Unplug FSR, check rear deck lid wires. How is he telling you exactly what the drain is? He would have the trunk open and may not have the trunk switch disconnected.
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  #8  
Old 01-17-2010, 03:35 AM
mujjuman mujjuman is offline
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what is FSU
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  #9  
Old 01-17-2010, 04:41 AM
kingmd kingmd is offline
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+1 on dalekressin trunk lid recommendation. I had this problem on my 98 528. The wires got frayed over the years and had shorted out. Check to ensure that ALL of your lighting is working in the trunk lid. In my case the license plate lighting was not working due to the short. This was causing a slow drain on my battery whether the trunk was open or not. Good luck.
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  #10  
Old 01-17-2010, 02:12 PM
Rjim Rjim is offline
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I submitted a post a few days ago titled "battery drain - temporary fix." The temporary fix was to disable the aux fan which according to BMW techs is only really essential in hot weather or when stopped in traffic. I bought an AC/DC clamp meter and checked for current draw at the negative battery terminal while pulling every single fuse I could get my hands on. The result: electric auxillary (pusher) fan was drawing current even when the car was in "sleep mode." This the fan in front of the radiator and A/C condenser, just behind the hood.
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  #11  
Old 01-17-2010, 05:17 PM
aawonw12 aawonw12 is offline
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Mein Auto: 2001 540i Sport Package
I had the same problem! I figured it out when my heater went out... It was my final stage resonater aka hedehog. Sometimes when that starts to go out it will turn on your fan when the car is off, hence the drained battery. If you are having probs with your heater i would bet that's what it is. good luck!
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  #12  
Old 01-18-2010, 12:22 PM
jdpaletta jdpaletta is offline
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Mein Auto: 99 E39 Wagon
Having a battery drain issue myself on my 99 528it. Got those great instructions for replacing the FSU and accomplished it fairly easily. However, as soon as I plugged in the new FSU the blowers all kicked on full power and the car was NOT on nor was the key even in the ignition. I had to pull the battery cable to turn it off and I pulled out the new FSU and called the parts place to confirm it was the right part which it is. Anybody have any idea what it means to switch what seems like a working FSU the new version and have it go full throttle? Do you think that confirms that that could be my drain problem area or do I need to keep looking?
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  #13  
Old 01-18-2010, 12:42 PM
Rjim Rjim is offline
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Quote:
Originally Posted by jdpaletta View Post
Having a battery drain issue myself on my 99 528it. Got those great instructions for replacing the FSU and accomplished it fairly easily. However, as soon as I plugged in the new FSU the blowers all kicked on full power and the car was NOT on nor was the key even in the ignition. I had to pull the battery cable to turn it off and I pulled out the new FSU and called the parts place to confirm it was the right part which it is. Anybody have any idea what it means to switch what seems like a working FSU the new version and have it go full throttle? Do you think that confirms that that could be my drain problem area or do I need to keep looking?
Sounds like you removed a good FSR and put in a bad one. I would pull the electrical connector off the top of the FSR, reconnect your battery and see if it holds a charge. If not, keep loooking because you might have two problems, FSR and something else.
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