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Was your car coded to HiFi or standard 6 speaker stereo? Is HiFi then speaker test will be faint music. You need to connect an amp and then speaker to test it clearly, I generally use a broken headphone which sounds loud enough on low level signal.
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650i F12 - HUD, 6WA, SLI, Logic 7, Dynamic and Adaptive Drive, Comfort Access, Soft-close, top-view,
Previous X5 40d M Sports and 535d LCI
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