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I have the Pioneer system as well. I put the CLD tiles from sounddeadenershowdown.com on the doors behind the panels, and I also put some on the back of the door panels. I don't have any vibration noises. Not sure if this will fix your problem. You might want to check if the wiring is rattling of it is literally the switches.
Another thought, the service manual says to replace the plastic clips every time the door panels are removed. You can get a box of the clips on Amazon for relatively cheap. New clips hold the panels tighter and could reduce vibrations and rattles. There are two different clips - the gray ones and the yellow ones. Each door panel requires 4 of each.
https://www.amazon.com/gp/product/B007AYCV92/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B007AYCVD8/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
Another thought, the service manual says to replace the plastic clips every time the door panels are removed. You can get a box of the clips on Amazon for relatively cheap. New clips hold the panels tighter and could reduce vibrations and rattles. There are two different clips - the gray ones and the yellow ones. Each door panel requires 4 of each.
https://www.amazon.com/gp/product/B007AYCV92/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B007AYCVD8/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1