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I don't see anything in common on the electrical schematics for both of these problems. You could have multiple fuse failures. For the daytime running lights check fuses IGNE fuse 10A and DRL fuse 10A in the UBEC (underhood bussed electrical center). For the reverse lights check fuses B/U LP fuse 25A and VEH B/U fuse 15A again in the UBEC.
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