My rattle is definitely coming from somewhere in the passenger rear area. Haven’t quite pinpointed it yet but def metal on metalWe finally have a fix. After 3 separate trips to Newport Lexus, 3 visits to Mission Viejo Lexus and miles of drive time with the shop foreman, they found the rattle and crackling sound in the drivers side door. The door panels on both the front and rear driver side were the culprits. They added felt tape behind each panel to stop them from rubbing on the metal of the door and the sounds are gone. No more B-pillar rattle or loose metal sounds and I couldn't be happier.