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I finally had a trip to the dealer (for scheduled maintenance), and asked them to check out this cold-start buzzing.
After much research and contacting TSE, dealer identified the root cause as "CD drive in the headunit was faulty". Or at least that's what they wrote up on the repair report.
They replaced the HU part # 65129-325-978, and the buzzing has gone away.
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'19 TM3P (BK/BK)
'15 F80 M3 (SO/SS)
ex-'17 I01 i3-BEV (PB/DD), ex-'15 I01 i3-REX, ex-E90, E46, E36's, E30's
Last edited by afadeev; 04-21-2017 at 09:55 AM..
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