I have a 2011 4Runner with nav. Chirping sound has been coming from my dash for a while. I finally ejected the nav data disk and it quit. Note sure if anyone else has had this problem. Every time i tried to take it to the dealer the sound would go away. I recorded the sound but they won't do anything about it until they hear it.Hope this helps if anyone else is trying to figure out where the sound is coming from
Silly stuff. It was my USB "turbo charger" . I happened to have my head right by it while working on brake controller. Removed... Reinserted... No problem since. Goofy.