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I am also experiencing this issue.
As a side note, I do not have the Navigation package.
But was told by a local audio shop that I do have the Bose system. (not sure if this is accurate?)
From my perspective this high pitched ping seems to be coming from the outside of the vehicle. I only hear the sound when in motion, which is easiest to hear in first gear when accelerating from a stand still. Although I do also hear it during regular driving.
The reason I feel this noise is external is due to the echo effect I hear anytime I'm in the down town area or surrounded by large buildings.
Wanted to share as much information as possible to try to narrow down the issue.
DN
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