My truck has been doing this only on the drivers seat since new, my useless dealer talked to toyota and they agreed to change the seat cover. I knew that wasn't the problem so tonight i opened up the back of the seat and found the problem and fixed it. There are 2 metal rods near the top of the seat that hold the fan for the ventilation. They run up to the top of the seat near where the headrest holes are. Thats where they're creaking. There is no room to get way up in there so i wedged a couple pieces of rubber between the rods and the plastic up there as far as i could reach to stop the rods from moving and making the noise. The noise is now gone so lets hope the rubber pieces in there....
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