Two different ECUs in play here; the BCU does the locking and windows (amongst other things) whereas the LCM does the lighting. I suspect a cable break or damage causing the tailgate issue - check the hinge areas of the glass and the tailgate itself as this is most likely where the cables will be failing. No idea about the dipped beam warning though.
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Free fault codes scan/clear (TOAF) - M1 J27 area
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