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Premium Member
2014 G550, 2000 SL500, 1995 E320 Cabriolet, 1980 TR8
1,511 Posts
Discussion Starter #1
I have a new 2007 ML350 and I've noticed that there is a really annoying buzzing sound coming from the command unit itself. It sound likes either a small fan or spindle motor or perhaps the switching supply for the florescent backlight on the display. It seems to spool up like a motor or fan, but sounds more like a really poorly designed switching power supply. The frequency is about 400 Hz.

The demo car I drove did not make this sound, but mine really does. Is this normal (I sure hope not) or is there a problem with my command system?

Thanks for any help,

- FD
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