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They are your parking assist sensors. They give an audible and visual reading of your proximity to an object when the truck is in gear.
 

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do you mean the 4 disks mounted to the rear bumper ?





those 4 holes are where the back up sensors go

If you back up to something, first the dash board instrument cluster will show that you are close to something & if you continue backing up, a buzzer goes off

Newer vehicles have them front & rear




 

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Yep park sensors. They came out around 2009 IIRC and the front ones were new for 2013. I don't like them because I think they're obnoxious, so I don't have them
 
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