So, how does this darned thing work? The passenger side window control switch will operate the window. The driver side control does not operate the passenger window or the mirror. Central locking does not work on passenger lock.
I read the switch units are not just switches, but control the door functions. Do I replace the passenger box, or the drivers side box? Is the a connector I need to peruse?

Thanks,
Jim

2003 e53 3.0