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If you hear like tin can hitting each other coming from the 2nd row driver side seat, this is caused by the hard plastic wire hitting the plastic of the car seat. Place some electric tape or isolate then this is fixed.
Aha! This is exactly what I've been hearing. Going to take a look at this as soon as I have some time. Thank you for sharing; really hoping this does the trick.
 

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We have the same issue on our 2014 Sienna. The metal on metal noise is enough to make a person not want to drive the vehicle. Our noise comes from the third row seats when in the up position. Noise goes away when they are stowed or if someone is sitting on the seat. 3rd row has two sections so someone needs to sit on each section for noise to go away completely. Short-term fix is to stow the seats when not in use.

After some trial and error discovered its the vibration of the vehicle (another issue we have with our new sienna that we didn't with our previous sienna) that causes the metal seat mechanisms to vibrate against the metal floor anchors. I placed a thin cloth on all eight floor anchors and the noise went away. I then removed them and squeak came back. ***This is not a fix because there is a good chance the extra padding could effect the safety of the seat***. However, it will show any service tech the location of the problem. No padding between those metal pieces equals squeak.
 

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I wrapped all the metal latches with Velcro. I haven't had an issue for a year or so.
Do you have to remove the seats to do that? There isn't much space when the seats are up to have access to the metals. I really want to try this myself but am not sure how.
 

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I read every post and first tried putting velcro over the latches which did not work. Then as I was looking under the seat, I bumped the right part of the cargo area with my foot and heard the rattle. Turns out the crank to the tire jack had gotten loose and was rattling against the jack. Super easy fix and good to eliminate this as the cause first. Just open up the compartment on the right side of the cargo area and see if there are any loose parts.
 

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I just recently purchased a 2014 XLE AWD with 30K miles on it. I noticed the crazy rattle noise with our first test drive and the used car dealer said they fixed it. Test drove a second time and the noise was gone. Bought the van and put the seat down and back up and now the noise is back. It is this same very irritating noise:

Has Toyota come up with a fix for this? Been searching all over and I haven't found any confirmation they know how to fix this. Bringing the car to a Toyota dealer on Friday. My wife is more than a little unhappy about this. I'm shocked this was an issue in 2011 and I'm seeing it on a 2014.
 

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Thanks for the video brain357... I have a '16 SE and have the same exact noise, but I think mine is coming from the 2nd row, left side. The noise goes away is someone is sitting in the seat, and will remain ok for the next day or so. It's like the weight of someone secures it, but it does come back.

I guess it wouldn't bother me so much is people actually sat in those seats often to mask the noise, but any seat other than driver and passenger only meet humans maybe 1-2 times a month.

My 5,000 tire rotation is almost due. I will make sure to have it noted for inspection on the R.O.
 

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I drove Japanese Alphard and Estima in Malaysia and they were far nicer than Sienna.

The smooth riding suspension and silent powertrains hit their mark beautifully. The roads of third-world Malaysia couldn’t even produce a rattle or squeak out of either interior. These characteristics are the true foundations of a luxury cruiser.

Shame on whoever did such a lousy job on sienna.
 

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Follow up... I had the noise inspected. It was coming from the Left Side 2nd Row Seat. Someone sat in the seat the night before, which put a band aid on the noise. The tech took it for a test drive, and the noise was minimal. He then had a tech lay on the floor while driving, and the noise was noted. End result, replaced the 2 rails, and the noise is now gone.
 

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5 years and counting and yesterday I have a 45,000 miles service so I bring up this issue to the Toyota Tech and he is very knowledgeable that he shown me the TSB about this same issue but saying Toyota does not have a solution for this because this is not a life threatening issue (like the side door recall which he told me I should receive the notice this week). He said he will call Toyota today and ask for the warranty coverage about the 3rd roll seat and will let me know I am qualified to do that. He said, if they are not warranty that, I should call them and file a complaint.....

I will post here again this week..........meanwhile, I think I will go tape up the mounting hook on the floor and get those rattling noise eliminated.
 

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UPDATE..............Toyota service department called me back and saying this is not a warranty service item and if I have to replace the latch to the 15-16 model it will be about $1200.

Totally expected and I told them I will use a $5 electric tape and fix it myself.
 

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I don't mean to dig this from the grave, but my one-month old 2017 Sienna SE has developed a rattle which sounds like it is coming from the third row seat. It is louder when the third row seat is folded to the floor. Other than the previous posts does anyone who drives a 2017 have had this issue before and was it covered by the warranty? The post above me stated it was not covered by the warranty.
 

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My car have same problem,3rd row really noisy before. Finally I solved the problem with ( WD-40 Specialist Spray and Stay Gel Lubricant No-Drip Formula ).
spray at every joint of seat, you need to fold down half way so you can see all the joint under the seat and spray it every joint. I use regular WD-40 before but didn't work still have rattle noise. Since I tried with this Gel Lubricant, already 2 months still quiet. Need to shake it very well before you spray. Good luck.
 

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Thanks to this thread I resolved the issue with my 2017. The 3rd row "60%" side was the culprit. I ended up doing the electrical tape fix on both the second and third rows. I noted that the 3rd row latches had a lot of grease applied from the factory I guess in an attempt to address the TSB. It's a shame that the design was never fixed in the many years this model has been on the road.

Now the remaining rattles are down to the level that my 2004 Ody was at when I traded it. :(

I may try the WD-40 Specialist Spray solution mentioned in the last post as there is still some random noise coming from back there but at least it's not the constant metallic rattle that was solved with the tape.

Anybody got a fix for a creaky driver's seat?
 

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My 2011 XLE AWD has started 'rattling' under the rear seat. The noise sounds like a piece of tin hitting another piece of metal. I laid on the floor while my wife drove, but could not find any loose pieces or see anything under the seat moving around. I retracted both seats and locked them back into place, ensured they were secure, but the rattle remains. It's definitely vibration-caused, and it is virtually continuous while driving. Any ideas before I spend a morning at the dealer?? Thx.
 
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