Ability to Hear High Frequencies
As people age their ability to hear high frequencies goes away. If the service people that rode in your car were older than 40, it's likely that they could not hear the sound.
I would suggest that you get some young friends to ride in the car and confirm the existence of the sound. I doubt that the navigation system has anything to do with the problem (as suggested by the dealer).
Obvious sources of a high frequency sound will be the IMA motor, the CVT transmission, and the inverter mounted on the battery pack. These assemblies could produce 1st order or higher harmonics that could be audible to the driver.
If finding the source of this noise is important to you, it will be essential to determine a set of circumstances that will always cause the noise to appear. That will make it possible to demonstrate the problem at the dealership and it might give clues as to what is producing the noise.
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