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Thread: Help request Constant high pitched noise from speakers. 2012 BMW 128i.

  1. #1
    Join Date
    Nov 2019
    Location
    W. Boylston, Ma.
    Posts
    12
    My Cars
    12 128i, 94 945, 90 780

    Help request Constant high pitched noise from speakers. 2012 BMW 128i.

    First here:


    It even happens if the fob isn't inserted.


    This noise is on the entire time it's running. It's definitely coming from the speakers.

    ~60 seconds after shutdown and fob removal, it stops. (ONLY if the car isn't running, stays on otherwise)


    Final symptom. I lose reception when the rear defroster is on (not too concerned with this as it appears to be somewhat common.


    I've done nothing with this car. It's all stock. I've had it just over a month.

    Any ideas? I'm leaning toward faulty HU.

  2. #2
    Join Date
    Nov 2019
    Location
    W. Boylston, Ma.
    Posts
    12
    My Cars
    12 128i, 94 945, 90 780
    I figured it out. It was the amplifier. I took it out and cleaned the contacts and also cleaned the ground tab that's on the rear wheel arch.

    Back to normal.

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