wire schematics

[tomfer]

Hi All,
I am looking for wiring schematics for an 84 533i. Specifically, my OBC does not retain info, which leads me to believe that I am having the power interrupted to that unit. I am hoping that if i can maintain power there, this will resolve the problem. I removed the kick panel and found the yellow connector for the CU this connector is the wire group for the display/keypad. Next to the yellow connector on the CU there is a larger connector in which there is a small female plug with a green and a white wire that is disconnected. No clue where this goes. Any suggestions?? Thanks, Tom