I have a 2019 Limited Level 1, and found a "module" about half the size of a pack of cigarettes that was loose behind the center rear seat. You have to remove the center carpeted "flap" that is behind the center seat. It is held on with magnets (which might have also caused a rattle), then reach down through the opening, and you will feel the module. It's only held on at the top with two push-pins, and is very loose. I just shoved a folded Kleenex beneath it, and taped it to the rear firewall with some painter's tape. no more rattle.