Squeaking noise solved on my 2011 Trail Edition

Guess I failed to fully address my problem. I've removed all the rubber shielding and I'm still hearing the squeaking.

What else would you check?
 
I had squeaking/rubbing noises around the driver's side b pillar on my 2015 where the seatbelt mounts, the driver's side door area and the A-pillar from what I could tell. I thought it was plastic trim or rattles in the seat belt mount point, but could never trace it.

I sprayed all of the door gaskets with a silicone spray and wiped it down (lightly) and almost all of the noise is gone, but now I hear what sounds like the splash guard noise that brought me to this thread, so I'll try all the great tips provided on how to fix that.

So, if you've already tried the splash guard fix, perhaps try the silicone door gasket spray as it seems like the issue I had was the dry gaskets rubbing/squeaking on the metal all around the driver's side door.
 
I noticed it first as a fluttering rattle coming from the FL of the vehicle at highway speeds.

I also began to notice a squeak over bumps. I was about to hand it over to my mechanic to address when I stumbled upon this fix on another forum and then magically here as well.

I walked outside and tapped the splash guard on the driver side and sure as $HIT it rattled around and squeaks as like crazy.

Ordered a set of the rad rubber mats immediately. Will report back shortly, but I’m ready to rip both side off ASAP as I think they’re both up to no good. I won’t hit any tracks before I get the replacements but I can’t wait to get rid of this issue.
 
I noticed it first as a fluttering rattle coming from the FL of the vehicle at highway speeds.

I also began to notice a squeak over bumps. I was about to hand it over to my mechanic to address when I stumbled upon this fix on another forum and then magically here as well.

I walked outside and tapped the splash guard on the driver side and sure as $HIT it rattled around and squeaks as like crazy.

Ordered a set of the rad rubber mats immediately. Will report back shortly, but I’m ready to rip both side off ASAP as I think they’re both up to no good. I won’t hit any tracks before I get the replacements but I can’t wait to get rid of this issue.

Rad Rubber is rad. The OEM ones fall apart and are junk. Rad Rubber is thick and seems like it will last forever while also solving the squeak issue.
 
Rad Rubber is rad. The OEM ones fall apart and are junk. Rad Rubber is thick and seems like it will last forever while also solving the squeak issue.

Is there any need to pad the gap with the Rad Rubber version between the frame and the splash guard as others have done with the stock ones?
 
I noticed it first as a fluttering rattle coming from the FL of the vehicle at highway speeds.

I also began to notice a squeak over bumps. I was about to hand it over to my mechanic to address when I stumbled upon this fix on another forum and then magically here as well.

I walked outside and tapped the splash guard on the driver side and sure as $HIT it rattled around and squeaks as like crazy.

Ordered a set of the rad rubber mats immediately. Will report back shortly, but I’m ready to rip both side off ASAP as I think they’re both up to no good. I won’t hit any tracks before I get the replacements but I can’t wait to get rid of this issue.

I tried using the foam weather stripping method that eHaze proposed. It works, although I had to use some gorilla tape as well to keep everything in place. The looks don't sit well with me. So I'm going with this solution. Hopefully the rad rubber mats work as the factory SHOULD have, because they aren't cheap ($50 - yikes).
 
I borrowed your picture and added a little more detail.

The retaining clips are reusable so don't try and force them out.
Start on the left, reach around the back and squeeze the protruding sides of the clip, then pull it out with your free hand. The clip on the right is a little harder to reach, but is accessible.

I cleaned the area, then applied two small strips of foam weather stripping...

10 minute fix.

Necro-posting but thanks so much for this. The stealership told my wife it was a rear dust cover and charged her to 'adjust it.' Shocker, it wasn't and the squeak returned after she picked her car up.

10 minutes and some double sided adhesive and no more squeak.
 
I have a little bit of an occasional rattling noise when the ac is on. I checked my splash guards and they are loose and I could see them being the rattle. I will try double side tape first and then Rad Rubber next.
 
My 2019 TRD Offroad too...
It was gone and came back spontaneously, a chirping and rattling. Quiet and only audible when the radio is off, but it annoyed me. I thought it was something behind the dashboard on the driver's side, no chance to localize it. But the google search quickly led me to the right hints in the forum. Thanks to everyone for the info.
The problem has been identified (see video with sound), now i have to fix it.
2019 4 Runner Driverside Noise - YouTube
 

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