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From a quick google search of the part number-56021561AC
Its a Daytime Running Lamp Module-
Open this link- and search for it in the document. You will need adobe reader to view it.
ok well since its the drl module it puts the headlights on a very low setting everytime you put the truck in gear until you shut it off or put the e-brake on, not necessary to have it working in the US, but in canada it is law, if its not working and there are no other problems i wouldnt worry about it