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Thread: Cable causing electrical crackling in dash and speakers.

  1. #1
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    Cable causing electrical crackling in dash and speakers.

    Tried to use vcds on my TTs this morning and kept getting electrical crackling coming from dash display and speakers.
    Quickly turned ignition off and removed cable. Tried again assuming cable wasnt connected properly. Same issue.
    Reluctant to try again to be honest...
    What do you reckon is causing this!?

  2. #2
    Verified VCDS User DV52's Avatar
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    ^^^ rick:Hi - interesting observation!

    I guess that anything is possible - but it's mighty difficult to comprehend how the addition of a VCDS dongle into the OBD port would cause an electrical problem of concern of the ilk in your question. I also guess that there might be a difference in our respective definition of the term "electrical crackling" - to me, it connotes something sinister and foreboding; an electrical fault simmering away in the background waiting for it's time to avalanche into a serious incident. Again, difficult to join the dots by simply plugging-in a VCDS dongle and interrogating CAN modules.

    That said, I've found that it's not unusual when powering up a VCDS cable to hear a "sparkle" sound from the car's speakers as the device interrogates the MIB module @ address hex5F. I've never thought to understand why this happens and I've certainly never been concerned at its occurrence - quite the opposite in fact; I would tend to worry if it didn't happen because it would indicate that the normal hex5F challenge/response dynamic has not been successful.

    So, is my "sparkle" noise = to your "electrical crackle"?

    Don
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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    Could well be :-D
    I've never heard it before so aborting immediately seemed the safest option.
    So nothing unusual?
    And no chance of smoking any electrical components? Pulling out mid scan seemed to throw a speaker fault in the drivers bass speaker.
    Could it be possible the crackling is a result of the software accessing it on scan?
    Apologies for my noob fear of breaking something :-D

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    Quote Originally Posted by Placeborick View Post
    So nothing unusual?
    I agree with Don - I don't think that if it is coming from audio system there is any concern.
    And no chance of smoking any electrical components? Pulling out mid scan seemed to throw a speaker fault in the drivers bass speaker.
    Could it be possible the crackling is a result of the software accessing it on scan?
    Apologies for my noob fear of breaking something :-D
    I do not think there is chance of damaging a speaker. Never heard of any user having such a problem.

    Every vehicle on which I scanned an audio system made some sounds when VCDS accessed the module. Pulling mid scan may confuse things and it is not recommended. However, I also do not think pulling the VCDS connection will cause harm. Setting a code? maybe..

    Don't apologize for learning. That's why we are here to help.

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    Thanks for the reassurance.
    I'm handy with tools, not at all with electrics :-D

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    Benevolent Dictator Uwe's Avatar
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    When exactly does this happen?
    When you plug it in?
    When you start a scan?
    When you access a particular module?

    More details please!

    -Uwe-
    Lock-down of sick people: Quarantine
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    Quote Originally Posted by Uwe View Post
    When exactly does this happen?
    When you plug it in?
    When you start a scan?
    When you access a particular module?

    More details please!

    -Uwe-
    During the basic scan.

    I was looking to clear an airbag fault i'd picked up when faffing with my front bumper

  8. #8
    Benevolent Dictator Uwe's Avatar
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    Tell us about the computer you're using. Is it a laptop? Is it on battery power, or do you have it plugged into the some source of external power?

    Can you make a video of this behavior?

    -Uwe-
    Lock-down of sick people: Quarantine
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    Old toshiba laptop, not mains connected.
    Sure I can try.

  10. #10
    Verified VCDS User DV52's Avatar
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    Quote Originally Posted by Bruce View Post
    Every vehicle on which I scanned an audio system made some sounds when VCDS accessed the module. .
    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
    Last edited by DV52; 05-20-2020 at 08:42 PM.
    VW Golf MkVII (MY13) - A3 8V hatch (MY17)

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