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Consider pulling fuses one by one. If the sound continues with engine off and battery connected, you may have a short to ground. Pulling and replacing each fuse until the buzz stops should isolate the circuit. Once isolated it should be easier to locate.
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2000 Boxster S
2010 Volvo XC60
2011 GMC Denali HD 6.6L (sold)
2008 Cayenne S (sold)
1989 Targa (sold)
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