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Message: <blockquote data-quote="beemerback" data-source="post: 734648" data-attributes="member: 24011">If it is the same sound that once happened in my E60...its the cd player.  In my case the cd player was the culprit.  It was slowly sapping power even when it is off.  The technician at Wearnes Autohaus traced it by segmenting the electronic circuitry.  I had to replace the whole radio/cd player. It was too much work to find out which diode/component was malfunctioning and besides, nobody wants to do it  or knows how to do it without damaging other parts.  You cant simply weld the circuitry.  Its a complicated affair.  The car may not recognise the replaced part too.  So I bit the bullet and once the set was changed, no more this problem.</blockquote>