No expert, but I tend to think a high pitched noise requires air being forced through a small passage, like how you change the pitch of a human whistle by pursing your lips tighter. Has anyone tried covering the mirror enclosure, mirror to attachment arm and the area where the mirror attaches to the door with blue painter's tape to see if the sound changes or goes away? Just a thought.
More like air passing
over a small hole. Imagine how a flute is played, or the beer trick of blowing over the top of a beer bottle.
Rat mentioned that the noise changed as he opened or closed the window making him suspect the window seal. I like the painter's tape idea. Try the painter's tape trick over all the window seals, where the seal meets the window, and where the seal meets the door frame. You could also tape the gaps between the door and body, move out from there to the passenger side A pillar, roof rack, etc.
I know our 2008 is different, and our noise is not a whistle, but the window seal has separated from the window frame. When I push it back into the window frame everything is silent again.
I'd also inspect
every attachment on the passenger side for alignment and gaps, or anything separating.
When you take a vehicle to a dealer, or any service place, the service manager probably gives this diagnostic job to the low guy on the totem pole and tells him he's got 10 minutes to find something, then to move onto another vehicle. He'll say anything so he can be productive and move onto the next vehicle as soon as he can. You can take more time doing the taping off yourself, then be able to tell the service manager what you found. I know they're supposed to do all this diagnostic stuff themselves, but you'll spend more time arguing and getting nowhere. This may not always be the case with dealers, but I can see why things like this go back to the service multiple times. I had an electrical fault on my power seat once. The car had already been to the dealer service for the same issue with the previous owner and they said they'd honour the previous warrantee on that. They said it was fixed, and the seat moved for me on the dealer lot. At home it stopped again. I got the wiring diagram, found the relevant electrical connector, opened it up, and found a bullet terminal was pushed out. I snapped it back in and never had problem again. This job had to be given to a rookie, he wiggled things around and got it to work, then said fixed. I could have argued with them, but then I'd be the customer from hell and I'd probably have bad service for more important items. And, they were very good to me for other things.
