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I am mid-stream on an OEM Nav install in place of my base radio and everything appears to be going okay so far (still need the VSS).
However, I am hearing a "whirling" noise, very faint, from the unit even when the car is completely off. Everything seems to work ok (when in ACC mode), and the unit shuts off as it should when I turn the car off, but for this noise. It sounds like maybe the disc(s) are turning, but I have no idea if that is the case. Indeed, with the car in off position I can't figure out what power it is getting.