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  1. #1
    Senior Member Three Rings
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    Apr 20 2009
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    Chicago

    Is this normal (white noise through speakers when car is off)

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    Hi guys:

    Question for those of you with a B7 (mine is an RS4 with RNS-E). Regardless of how long my car has been off, I can hear faint white noise coming from the speakers. The sound is similar to what you might hear from relatively quiet HEPA filter.

    I realize that the audio system on this car can be powered on for a period of time after keys have been removed from the ignition. Curiously enough, I can leave my car off for 24 hours and still turn the radio on/off (with no keys). Also, I can't get a remote on/off to work from the wiring on the amp in the trunk.

    So, is my car possessed or is it just me? Does anyone else's car produce white noise whenever off?

  2. #2
    Registered User Three Rings 05.5SilverS4's Avatar
    Join Date
    Jun 14 2009
    AZ Member #
    43738
    My Garage
    2005.5 S4 , 2000 Yamaha R6
    Location
    Fishers, IN

    Re: Is this normal (white noise through speakers when car is off)

    Youre radio will always turn on when they keys arent in the car. As far as the white noise, i cant help you with that, mine doesnt make it.

  3. #3
    Senior Member Three Rings
    Join Date
    Apr 09 2009
    AZ Member #
    40990
    Location
    Ontario, Canada

    Re: Is this normal (white noise through speakers when car is off)

    Mine does the same. The white noise isn't on all the time, but starts up once you open the door. I'm wondering if it has something to do with nav, as all 3 of my current cars have nav and they all start hissing as soon as I open the door. None of my previous cars did it, and none of them had nav.

  4. #4
    Veteran Member Four Rings drew's Avatar
    Join Date
    Jul 27 2004
    AZ Member #
    2917
    My Garage
    E60 M5, VW Tiguan 4Motion Gone: 996TT stage 3, E46 M3, B6 S4
    Location
    Anaheim Hills, CA

    Re: Is this normal (white noise through speakers when car is off)

    its the nav

  5. #5
    Veteran Member Three Rings charliemike's Avatar
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    Jul 24 2008
    AZ Member #
    31231
    Location
    Maryland

    Re: Is this normal (white noise through speakers when car is off)

    Quote Originally Posted by drew View Post
    its the nav
    I have it too, so this is good to know.

    It's also nice to own a car so quiet I can hear it :)

  6. #6
    Veteran Member Four Rings iconoclast's Avatar
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    Sep 15 2006
    AZ Member #
    11431
    Location
    In, Out and Around...

    Re: Is this normal (white noise through speakers when car is off)

    are you referring to the fan in the rns-e?

  7. #7
    Senior Member Three Rings
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    Apr 20 2009
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    Chicago

    Re: Is this normal (white noise through speakers when car is off)

    Guys, the noise definitely comes from my speakers (all of them). It is faint and sounds like a quiet hepa filter.

    As an aside, why in the world would Audi design the stereo to operate indefinitely with no key in the ignition? I can understand a few minutes...but until the battery is dead?

  8. #8
    Veteran Member Four Rings RAudi Driver's Avatar
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    Dec 05 2006
    AZ Member #
    13954
    Location
    So. Cal.

    Re: Is this normal (white noise through speakers when car is off)

    I'm sure it's a normal thing. My B6 did it or maybe it was my B7, I can't remember but one of the cars did it.

  9. #9
    Established Member Two Rings
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    Feb 20 2009
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    38948
    Location
    central coast, california.

    Re: Is this normal (white noise through speakers when car is off)

    In my 05 B6, stereo only runs about 15 minutes with key off.(no nav).

  10. #10
    Veteran Member Four Rings drew's Avatar
    Join Date
    Jul 27 2004
    AZ Member #
    2917
    My Garage
    E60 M5, VW Tiguan 4Motion Gone: 996TT stage 3, E46 M3, B6 S4
    Location
    Anaheim Hills, CA

    Re: Is this normal (white noise through speakers when car is off)

    Quote Originally Posted by TypeRx View Post
    Guys, the noise definitely comes from my speakers (all of them). It is faint and sounds like a quiet hepa filter.

    As an aside, why in the world would Audi design the stereo to operate indefinitely with no key in the ignition? I can understand a few minutes...but until the battery is dead?
    the faint hum from the speakers is caused by the nav because it runs even after you turn of the ignition to completely shut down. some are louder then others in this respect.

  11. #11
    Veteran Member Three Rings justinperkins's Avatar
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    May 14 2009
    AZ Member #
    42518
    My Garage
    B6 S4 Avant & C5 A6 Avant Q
    Location
    ATX

    Re: Is this normal (white noise through speakers when car is off)

    Quote Originally Posted by TypeRx View Post
    why in the world would Audi design the stereo to operate indefinitely with no key in the ignition?
    All VW and Audi vehicles have been doing this for quite some time. It's handy if you're sitting in your car or maybe you're parked somewhere with the doors open. Somebody said it only runs for 15 minutes but I thought it was more like an hour. Whatever, it says in the owner's manual how long it will run.
    -justin

  12. #12
    Veteran Member Three Rings handyvorb's Avatar
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    Jan 31 2009
    AZ Member #
    38120
    My Garage
    '04 S4, '95 Eagle Talon MSnS
    Location
    Huntsville, AL

    Re: Is this normal (white noise through speakers when car is off)

    Yup exactly ^, don't forget bluetooth and Onstar also use the speakers.
    Joel Baldridge
    Stage 4 Audi Technician (Master Guild Certified)

  13. #13
    Senior Member Three Rings Philosophyy's Avatar
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    Apr 21 2009
    AZ Member #
    41526
    My Garage
    2008 Sprint Blue S4
    Location
    Long Island/ ASU Tempe

    Re: Is this normal (white noise through speakers when car is off)

    This doesn't happen with me but, I am also very hard of hearing. Maybe It does happen in my car as well.

  14. #14
    Veteran Member Three Rings handyvorb's Avatar
    Join Date
    Jan 31 2009
    AZ Member #
    38120
    My Garage
    '04 S4, '95 Eagle Talon MSnS
    Location
    Huntsville, AL

    Re: Is this normal (white noise through speakers when car is off)

    Yes, I haven't personally heard the white noise from my speakers with the RNS-E (I have the bose speakers). I haven't got down close to them to try and listen for it. If it's actually loud, I would say the coding or adaption may not be quite right (maybe the bose equipped selection) and to re-check those.
    Joel Baldridge
    Stage 4 Audi Technician (Master Guild Certified)

  15. #15
    Veteran Member Two Rings sear's Avatar
    Join Date
    Feb 19 2008
    AZ Member #
    25453
    Location
    Colorado Springs

    Re: Is this normal (white noise through speakers when car is off)

    I've got the RNS-E with Bose speakers and I hear this noise sometimes too. It's been happening for a while, but I havn't really been too worried about it.

  16. #16
    Veteran Member Four Rings GotRS?'s Avatar
    Join Date
    May 18 2008
    AZ Member #
    28921
    My Garage
    RS5
    Location
    SoCal

    Re: Is this normal (white noise through speakers when car is off)

    Just timed mine. A few seconds over one minute. The level is high enough to turn on my auto sensing sub amp. Still find it odd to turn the amplifiers on without the head unit being on?

  17. #17
    Veteran Member Four Rings Retsujou's Avatar
    Join Date
    Dec 07 2008
    AZ Member #
    36063
    My Garage
    08 RS4 Tit/Exec/Prem/Carbon
    Location
    Mississauga

    Re: Is this normal (white noise through speakers when car is off)

    Sometimes people hear a sound which is the low pressure fuel pump priming the lines. Is that what you are referring to? it happens once you open the door after unlocking the car and has a slight whooshing/white noise sound to it.

  18. #18
    Active Member Two Rings
    Join Date
    Jun 27 2007
    AZ Member #
    19108
    Location
    Maryland

    Re: Is this normal (white noise through speakers when car is off)

    Yah its normal, mine does it as well. Kinda sounds like a low level hiss from the speakers.
    2013 BMW 328i (2/13-present)
    2007 RS4 (10/07-present)
    2003 A6 2.7t (6/06-2/13)

  19. #19
    Senior Member Three Rings
    Join Date
    Apr 20 2009
    AZ Member #
    41448
    Location
    Chicago

    Re: Is this normal (white noise through speakers when car is off)

    Quote Originally Posted by GotRS? View Post
    Just timed mine. A few seconds over one minute. The level is high enough to turn on my auto sensing sub amp. Still find it odd to turn the amplifiers on without the head unit being on?
    Agree -- I think this might be why the remote power lead I am using from the bose amp runs hot all the time. It sucks -- I have to pull a fuse everytime I want to shut the amp off.

  20. #20
    Veteran Member Three Rings PetrolDave's Avatar
    Join Date
    Jan 14 2007
    AZ Member #
    14870
    My Garage
    2006 B7 RS4 Avant
    Location
    Hampshire, U.K.

    Re: Is this normal (white noise through speakers when car is off)

    Quote Originally Posted by GotRS? View Post
    Still find it odd to turn the amplifiers on without the head unit being on?
    The head unit IS on, but in a "hidden state".

    When you unlock the car the head unit is booted up - this gives it more time to boot up (initialise the sat nav, read the map, get a GPS fix, etc.) - but it displays a blank screen until you turn the ignition on.

    Similarly when you turn the ignition off it doesn't actually turn off the head unit, it again goes into this "hidden state" which it only exits when you either lock the car or after around 30 minutes. This is so that it won't have to reboot if it's only a short stop.

    The amplifier enable line is (unfortunately) taken active even when the head unit is in this "hidden state" - hence the hiss from the speakers even when the head unit is apparently off.



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