If the radio is off, and you still hear buzzing, my guess would be not the radio. Have you added anything, like fluorescent lighting? LED bulbs? If you have done anything, undo it. You may have created the problem, in which case it won't be a warranty issue, and you will be charged. Just a guess. You could also pull the radio, and unplug it, just a couple of connectors, and verify radio or not.
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LadyWindrider
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT
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