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E60 (2004 - 2010)
BMW 5-Series (E60 chassis) was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E60 is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 03-03-2011, 01:10 AM
22Slinger 22Slinger is offline
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Location: Sydney
 
Join Date: Mar 2011
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Mein Auto: 525i
Buzz under the hood while car is off

I am looking at buying a 2003 530i, and while looking under the hood (before taking it for a spin) there was a faint buzzing noise under the hood. The sales guy said it is the power running the computer, which is always running. I find it hard to believe that is possible without burning out the battery regularly.

Does anyone know if this buzz, and if it is normal?
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  #2  
Old 03-03-2011, 06:40 AM
jesimmons jesimmons is offline
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Location: Falls Church, Va
 
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Mein Auto: 2008 535i
Not sure about the 2003, but my 2008 e60 "wakes up" as soon as I unlock the door, or open any door - even before inserting the key to start up. Normally about 15 minutes after shutdown, if no further interaction with the vehicle, the systems go to sleep and the battery drain then is only a few milliamps... supposedly not enough to drain the battery quickly.

I hear the same faint buzzing in mine as well. I think you'll find that after the 15 minute sleep delay, all noises will stop (if everything is working as it should).
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  #3  
Old 03-04-2011, 01:02 PM
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Dasyhrd Dasyhrd is offline
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Location: In a little grass shack out in da Pacific..
 
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Posts: 106
Mein Auto: 08 528i
I too wonder what components are being discharged? Also, what is the buzz after you immediately shut the doors?
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Old 03-04-2011, 05:55 PM
skippy_ps skippy_ps is offline
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Location: Palm Springs, CA
 
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Mein Auto: '05 530i
Fuel pump charging the system. If you're cleaning your car, opening and closing the hood, trunk and doors, the fuel pump will run nearly constantly until you close everything up. Since I make a lot of short trips and it's tough keeping the battery up, I just gave up and connect a 6 amp charger to the car when I'm vacuuming it out. Ridiculous but there it is.
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