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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 07-09-2012, 12:09 PM
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ill_kuma ill_kuma is offline
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FSU - Battery Drain

My A/C fan has been acting erratically and yesterday found out my battery is drained. Had to jump it. I know that there are alot of threads regarding FSU but I want to know if there is something I can do to prevent battery drain for temp solution until I get the new FSU. I just unplug the battery after I parked today. Thanks...
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  #2  
Old 07-09-2012, 12:47 PM
edjack edjack is offline
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Unplug the FSU. But, no A/C then. How long does it take to stop by the dealer and pick up a new FSU? ebaY units are not reliable, and you'll be wasting your money.

"unplug the battery?" How you do that?
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Last edited by edjack; 07-09-2012 at 12:50 PM.
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  #3  
Old 07-09-2012, 03:58 PM
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ill_kuma ill_kuma is offline
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Quote:
Originally Posted by edjack View Post
Unplug the FSU. But, no A/C then. How long does it take to stop by the dealer and pick up a new FSU? ebaY units are not reliable, and you'll be wasting your money.

"unplug the battery?" How you do that?
I leave to work by 7AM and do not get home until 10PM so no way I can stop by the dealer.

So I should not think about ordering a used OEM one from ebay?

"unplug the battery" = remove the negative cable...sorry, didnt use the correct term
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  #4  
Old 07-09-2012, 08:27 PM
edjack edjack is offline
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Suit yourself.
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  #5  
Old 07-10-2012, 07:35 AM
jygesq jygesq is offline
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most dealers will mail small parts to you

Quote:
Originally Posted by ill_kuma View Post
I leave to work by 7AM and do not get home until 10PM so no way I can stop by the dealer.

So I should not think about ordering a used OEM one from ebay?

"unplug the battery" = remove the negative cable...sorry, didnt use the correct term
for a small charge. NOT not from EBAY,
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  #6  
Old 07-10-2012, 09:20 AM
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ill_kuma ill_kuma is offline
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Just ordered from BMW dealer today. In the meanwhile, I will have to unplug/disconnect/remove the negative cable each time I park my car for a long period of time (morning and night).
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  #7  
Old 07-10-2012, 09:27 AM
dvsgene dvsgene is offline
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Quote:
Originally Posted by ill_kuma View Post
Just ordered from BMW dealer today. In the meanwhile, I will have to unplug/disconnect/remove the negative cable each time I park my car for a long period of time (morning and night).
You should buy one of these and just unscrew the knob. Saves the pain of hazard of constantly removing the negative cable.

http://www.amazon.com/Post-Battery-M.../dp/B001N729FS

Bets $8 I spent in a while.

Last edited by dvsgene; 07-10-2012 at 09:28 AM.
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  #8  
Old 07-15-2012, 10:13 AM
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ill_kuma ill_kuma is offline
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Ok, I replaced the FSU and blower is running normal now BUT still woke up this morning to a dead battery. What next? Check battery if its holds charge?
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  #9  
Old 07-15-2012, 11:52 AM
acoste acoste is offline
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Measure the battery sleep current (wait 20 minutes after turning off the ignition) and start removing the fuses. Sleep current shouldn't exceed 50mA.

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  #10  
Old 07-15-2012, 02:51 PM
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ill_kuma ill_kuma is offline
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Originally Posted by acoste View Post
Measure the battery sleep current (wait 20 minutes after turning off the ignition) and start removing the fuses. Sleep current shouldn't exceed 50mA.

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So should I wait 20 mins after I open the trunk as well or can I do this right after the trunk light goes off?
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  #11  
Old 07-15-2012, 03:51 PM
edjack edjack is offline
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After the trunk light goes off = 16 min.

Where did you get the FSU? Did it have 39 spikes on the heat sink?
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  #12  
Old 07-15-2012, 05:58 PM
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ill_kuma ill_kuma is offline
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Quote:
Originally Posted by edjack View Post
After the trunk light goes off = 16 min.

Where did you get the FSU? Did it have 39 spikes on the heat sink?
I ordered the OEM FSU from a dealer. Its has the 39 spikes.

Ok, this is what I have done so far.
Started reading at 3.53Amp.
Removed fuse #4 to disable the interior/trunk/glove compartment lights.
Reading at 1.50 - 1.53 after removing fuse #4.

For References:
#7 = Cigarette Lighter
#12 = Immobilizer (What is this?)
#13 = Driver Seat Adjustment
#22 = Auxiliary Fan
#31 = ABS (My ABS light is on in dashboard - light came on after getting car back from shop for the fuel pump wire issue)
#56 = On-Board Monitor / Radio (I have a DICE unit that is routed from the trunk)

Troubleshooting Begins:
Removed #7 and it dropped to .80
Plugged back in and it stayed on .80 until I re-read with the multimeter again then back to 1.51.

Removed #12 and it dropped to .81
Plugged back in and reading is back to 1.51

Removed #13 and it dropped to .81
Plugged back in and it stayed on .80 until I re-read with the multimeter again then back to 1.51.

Removed #22 and it dropped to .81
Plugged back in and reading is back to 1.51 (saw sparks when plugging back in)

Removed #31 and it dropped to 1.40
Plugged back in and reading is back to 1.51

Removed #31 and it dropped to .80
Plugged back in and reading is back to 1.50

After removing fuses # 7, 12, 13, 22, 31, 56 the reading is at .09-.10.

Any advice / ideas?

I also had this issue.

Last edited by ill_kuma; 07-27-2012 at 09:41 PM.
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  #13  
Old 07-15-2012, 06:20 PM
pleiades pleiades is offline
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Unplug power from the DICE unit.

Let the car go to sleep. What do you see?
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  #14  
Old 07-15-2012, 06:23 PM
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ill_kuma ill_kuma is offline
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Originally Posted by pleiades View Post
Unplug power from the DICE unit.

Let the car go to sleep. What do you see?
So try the procedures again with the DICE unit unplugged?
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  #15  
Old 07-15-2012, 06:29 PM
pleiades pleiades is offline
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So try the procedures again with the DICE unit unplugged?
yes
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  #16  
Old 07-15-2012, 06:36 PM
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ill_kuma ill_kuma is offline
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Originally Posted by pleiades View Post
yes
Too dark outside now and no garage. Will have to wait until next weekend. At the meantime, I guess I will unplug DICE unit. Is there anything else I can unplug (like fuses) to save my battery?
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  #17  
Old 07-15-2012, 06:42 PM
pleiades pleiades is offline
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Quote:
Originally Posted by ill_kuma View Post
Too dark outside now and no garage. Will have to wait until next weekend. At the meantime, I guess I will unplug DICE unit. Is there anything else I can unplug (like fuses) to save my battery?
Probably but I would not be surprised if the DICE is your parasite.

You could install a disconnect switch like dvsgene recommended. You may be able to find one locally at an automotive store or walmart.

And you might want to run the car and do test #9 on the instrument cluster to measure your alternator's health.
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  #18  
Old 07-16-2012, 10:45 PM
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ill_kuma ill_kuma is offline
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Originally Posted by pleiades View Post
Probably but I would not be surprised if the DICE is your parasite.

You could install a disconnect switch like dvsgene recommended. You may be able to find one locally at an automotive store or walmart.

And you might want to run the car and do test #9 on the instrument cluster to measure your alternator's health.
Nope, the DICE is not the the parasite. Came back to the car tonight and was dead again.
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  #19  
Old 07-16-2012, 11:19 PM
pleiades pleiades is offline
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Originally Posted by ill_kuma View Post
Nope, the DICE is not the the parasite. Came back to the car tonight and was dead again.
If your battery is going flat so often, it may already be too late to save it. You should charge it completely and then take it somewhere to have it load tested (Autozone or some store that will do that). A failing car battery may show 100% charged but not have enough usable amps to do its job.

I hope you find the parasite soon.
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  #20  
Old 07-31-2012, 08:46 AM
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ill_kuma ill_kuma is offline
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So fuse #22 is the Aux Fan. I removed the fuse #22 and left the car there for 5 days without starting it up. Then I put back the fuse #22 and it started up with no problem. It is safe to say that this is related to the Aux Fan. I read that some E39's Aux Fan will turn on or stay on after the car shuts off. In my case, the fan shuts off and does not start up by itself...only thing is its constantly draining the battery.

Where should I go from here?
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  #21  
Old 07-31-2012, 09:05 AM
granlund granlund is offline
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It's most likely the aux fan controller that is going bad. You get erratic operation of th aux fan; sometimes it doesn't start when the A/C is engaged; it may also run after ignition is switched off. A friend had a similar problem with his aux fan on an e46 (same construction) and the controller shorted out and caught on fire.
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  #22  
Old 11-29-2012, 11:55 PM
StRaNgEdAyS StRaNgEdAyS is offline
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I have had a battery drain issue as well, it will be fine for weeks sometimes, other times it will be mere days between flat battery episodes... I do hear a fan going inside the A/C unit from time to time after the car is shut off, sometimes hours afterwards.
I will investigate this Aux Fan as to being the possible culprit. This will be a huge worry off my mind because it's nerve racking not knowing when the dreaded 'click-tick-tick-tick' will strike... it can happen anywhere at any time.
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