X5 Lower Rear Tailgate Switch Problem

[Hoopie]

Hello all,
It’s been a long time since I’ve participated. I have found a few posts with this topic. But I still need help. My X5 is a 4.4i 2000. My rear upper hatch works fine. Works with key fob button, interior button, and exterior push button. The problem is with the lower tailgate button. Symptoms? No noise, no open. Work already done - replace button (no change), find and test both fuse and relay (all good), open up lower tailgate inspect and test the motor and mechanism(works), remove upper hatch mechanism for microswitch (cleaned and clicking fine). Inspected wires to relay all working. Somewhere there is not power to the tailgate button or something else. Was hoping someone. Ould help me with this electrical gremlin.