With it being a holiday, and the Agent (wife) not working today, I snagged the regal to do an oil change and look at the back dash rattle. She keeps reminding me it hasn't been fixed yet.
So here is what I did and found:
(With any DIY, it's a Do It Yourself, you are responsible for proper removal, replacement and completion of this project)
Lay down the back seats.
Then pull off the side trim pieces.
In this pic, the small rectangle piece slides straight out, remove it. It'll start with a small flat screwdriver
Now GENTLY, from the top, pull the top down and towards center of car, kinda like the bottom is the pivot point. There are 3 clips that will POP out as shown in this pic. BE CAREFUL with the part that goes around the seat belt. Remove the belt if you want to get this piece out of the way, or just set it aside still hooked with the seat belt.
Ok there's only 2, but the other stayed on the car, you get the point.
Now remove the 3 trim holders on the front of the back dash piece.
A small flat screwdriver gets it started, then pull it out by hand.
It's the small round circle in this pic:
Now the back dash will lift up and towards the front of the car, remove it.
Here is what you have now:
At the back, near the window, is a small black plastic stand. I believe this is the source of our rattle. It slides out towards the front of car.
Idk if this tape is from factory or what the dealer did in their attempt to fix the rattle:
But this piece was still loose, and as you can see in this pic, rubbing on the back dash. About 6 little marks in the pic were rubbed/worn, and the 2 bigger black marks looked rubbed too. IDK for sure, not having seen it new.
I added some thin 3M double sided tape everywhere there were rub marks and to the feet of the black plastic stand.
Reassembled everything. I used to be able to just press down on the back dash by hand and hear the rattle. Now when I press down, no rattle.
Hopefully this fixed it. I will update as I hear back on it, or feel free to bump the thread.