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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 01-27-2014, 04:56 AM
zersys zersys is offline
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Location: Sydney
 
Join Date: Jun 2013
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Mein Auto: 02' E39 530i Executive HL
FSU battery drain - temporary solution?

Hi all,

Pretty sure my fsu is going bad, my fan blower comes on every couple of minutes to twenty seconds for about five seconds after the car is turned off, locked, and continues to do so in sleep mode.

Anyway, I refuse to pay Aussie prices for a new one. But I won't be able to get a new one from the USA soon, so I would like to know if there is a temp solution like pulling a fuse or something to stop it from draining the battery while it's parked at night. The solution has to be a two minute job though so that I can do each morning before going to work so that I can actually use the blower when the car is operational.

Cheers.


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  #2  
Old 01-27-2014, 05:11 AM
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mjalloul11 mjalloul11 is online now
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Mein Auto: 1996 528i 1999 MB c240
Remove the connection to the FSU . The main fuse is behind the glove box.
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Old 01-27-2014, 05:13 AM
JimLev JimLev is offline
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Mein Auto: 540/6, S60 Volvo, Tribeca
If it is in fact a bad FSU you can disconnect the negative battery terminal, it's much easier to get to.
If its a bad HVAC control panel there are 2 fuses that supply power to it. This panel sends a control voltage to the FSU to tell the blower motor how fast to spin. With the fuses out there will be no control power going to the FSU.
Disconnecting the battery would probably be the quickest and easiest.
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Old 01-28-2014, 06:45 PM
zersys zersys is offline
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Location: Sydney
 
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Mein Auto: 02' E39 530i Executive HL
It seems you guys are right, so that's what I've been doing. FSU should hopefully come in next week or Friday.

Thanks for the advice!


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Old 01-29-2014, 05:42 AM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,523
Mein Auto: 02 BMW 525i M54 auto 130K
- How to troubleshoot a bad FSU final stage unit (1) and how to build a test jig for your FSR final stage resistor (1) & how to autopsy or repair solder cracks in your blower motor resistor (1) & how to replace your HVAC blower resistor (1) (E46) & what FSU is the right one to buy (1)
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Please read the suggested threads, where the best always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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