Does any one have the high pitch that intermittently comes through the speakers? I have tried to isolate it, but can only come up with the AUTO feature in the AC system. Makes no difference if it is on recirc or outside air.

The louder I turn up the radio, the louder it gets... yet is very faint. In fact I did not notice it happening very often, until a extended trip on the road. It is quite rhythmic.

 

OEM or aftermarket stereo? If aftermarket, a bad stereo ground can often cause the noise you're describing.

 

Also excessive gain on the amp to the speakers. That was my case.

 

If it's aftermarket it could be a few things. OEM...I don't remember having any issues like that.

 

Sorry for the late reply, I thought I replied Thursday.

It is stock Bose with Navi.

 

Not normal...I would let the dealer deal with it.