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Thread: Cable causing electrical crackling in dash and speakers.

  1. #11
    Ross-Tech Employee
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    Quote Originally Posted by DV52 View Post
    Bruce: now that rick has raised this matter and (I assume) piqued our collective interests in the phenomenon - does RT have a theory as to why the "sparkle" sound happens?

    What is it about the challenge/response interrogation process from VCDS that causes this effect? Incidentally, the same dynamic occurs with my OBD11 dongle - so it can't be caused by earth loops (unless the earth pin in the OBD connector itself is implicated).

    Don
    Don't know what Ross-Tech thinks. Bruce thinks that during the dialog of/with the audio system for faults, perhaps the system actually does a real fast test to see if speakers are shorted. If it did as this old one thinks, the speaker would likely make a sound. Since one of our techies was in the car once when it happened and I asked about it, the response - yeah that's normal- I quickly learned to ignore it and moved on. I am not quite as curious as some on this.

    Maybe someone in the real know will reply.

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  3. #12
    Verified VCDS User iichel's Avatar
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    ^ same happens whenever I diagnose the radio or de external VW amp. I'm under the impression it's some kind of diagnostic process.

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  5. #13
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    My guess is that it gives out a ping that the mic picks up to verify that the speaker is OK. That's probably why there are Test Freq values in the admaps.

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  7. #14
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    just out of curiosity, when is this supposed to happen? I have scanned my car a gazillion of times and never heard any tone/noise from the 5F.

    of course if idle it will power up when polled, but it just plays whatever source was selected as last.
    my Golf left the factory with 18 ECUs. now she has 27. and counting

  8. #15
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    When performing basic scan.

    I'd used it a couple weeks and never heard anything before either.

    Tried to get a vid but the mic on my phone isn't great and it didn't pick it up.

    Its several seconds into the scan, definitely as it accesses that module.

    Nothing has blown up anyway 😄

  9. #16
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by Placeborick View Post
    Its several seconds into the scan, definitely as it accesses that module.
    If this happens only when accessing the radio, or perhaps the amplifier ("Sound System", if installed) or a similar module, I really wouldn't worry about it much.

    -Uwe-
    Lock-down of sick people: Quarantine
    Lock-down of healthy people: Tyranny

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  11. #17
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    Here is the error thrown by the phenomena

    2 Faults Found:

    0517 - Front Right Bass Speaker
    B1062 13 [009] - Open Circuit
    [Tieftonlautsprecher Kanal 2: Unterbrechung]
    Confirmed - Tested Since Memory Clear
    Freeze Frame:
    Fault Status: 00000001
    Fault Priority: 6
    Fault Frequency: 1
    Reset counter: 20
    Mileage: 93670 km
    Date: 2020.05.25
    Time: 11:44:37

    Voltage terminal 30: 12.1 V

    0518 - Front Right Treble Speaker
    B1064 13 [009] - Open Circuit
    [Hochtonlautsprecher Kanal 2: Unterbrechung]
    Confirmed - Tested Since Memory Clear
    Freeze Frame:
    Fault Status: 00000001
    Fault Priority: 6
    Fault Frequency: 1
    Reset counter: 20
    Mileage: 93670 km
    Date: 2020.05.25
    Time: 11:44:54

    Voltage terminal 30: 12.1 V

  12. #18
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    Those two speakers are normally connected in parallel. It would appear that that speaker line has been disconnected from the HU.

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  14. #19
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    Quote Originally Posted by o33err View Post
    Those two speakers are normally connected in parallel. It would appear that that speaker line has been disconnected from the HU.
    Interesting, I've never messed with that.

    However I replaced the drivers door a few years ago.... I will whip the doorcard off and see if everything is connected properly.

    Thanks for the info

  15. #20
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    There was indeed a dodgy speaker connection on the back of the head unit.
    Sorted and the crackles have vanished with it.
    Mystery solved. :-D

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