I am very happy with my new TL but it did come with a few rattles. Now that I have solved all the major rattles (thanks to this forum) the car is almost deafening and I love it. The engine sounds so much better when it's the only thing you hear.
These are the rattles I solved using this forum:
Both front door window trims. Pulled the trim out and put in weather stripping
Front Left Speaker rattle
Front Center Speaker rattle
Left Rear Door Panel (Dealer fixed this one, something was really loose in there)
Removed Sun Glasses Holders from both pockets
Front Passenger Seat Rattle (This Thread)
So I have searched long and hard for this rattle, even took it into the dealer and they couldn't find it. I just told them it was a passenger side rattle so they didn't have much to work with any way. This was the most annoying rattle so I had to fix it. I got some of the ideas from others who posted putting felt under the front seat bolt but here's my story.
You hear a clicking/popping rattle that sounds like taking a nickel and tapping it against metal on the passenger side (actually under the seat). At first it sounded like it was coming from the passenger door panel but when I hunted it down I realized it was the seat. It normally occurs when you have a passenger sitting in the seat and you go over a rough road. For me it didn't really do it as often if there was no one sitting in the seat. The clicks were around 3 or 4 a second so it was slow and kinda loud.
You can reproduce the sound by doing one of the following.
Sit in the seat and head bang (as if you were at a rock concert that had the music turned down so it's kinda mellow)
. Don't head bang too hard, but not too soft either.
Open the passenger car door, kneeling outside the car, put your chest on the seat, and chest hump it
yeah that motion
. That's how I was able to track it down finally.
So if you have this rattle here's what's going on and how to fix it.
It's metal on metal a couple inches behind the front 2 seat bolts. For me the only one making noise was the metal tab on the right side closest to the door. Here are some pictures.
Looking from outside the passenger side door. Front right of passenger side seat. The noise maker is a couple inches behind the seat bolt.
Camera under the front right of seat (hard pic to take, geez!
Much clearer side angle pic of the metal tab behind the front left bolt. Remember this metal tab sits on the metal floor so it clicks/pops if it has any play.
Things you will need to fix it:
One sheet of felt from Walmart (20 cents)
Flashlight if you're not a carrot eater
1. Cut out two 1" x 2" rectangles of felt
2. Take out the front two seat bolts with 14mm socket.
3. Lift up on the seat and slide felt pieces under left and right metal tabs shown in pictures above
4. Chest hump the seat to make sure you got it right (make sure neighbors aren't around)
5. Put the seat bolts back in nice and tight.
That's it! Not very difficult and works like a charm! Seeya rattle!