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Not sure what that code is for, but when you don't have any lights in the rear the problem is usually in the ground side of those circuits. In the shop we usually hook up a test ground using a length of wire with an alligator clip on each end and a 12 VDC test light and check to be sure there is actually no power into any of those circuits affected. Then go in the direction that points to. I will offer a phone chat option for you in case you want to have that personal instruction on how to proceed.