The remote locking, mirror and window don't work on my mates 2001 diesel either. We tried outstation swop and also the latch tests, all good but no difference, nowt works. We have power at the purple? Wire at the outstation too.
We can only randomly fiddle with it because of other commitments on his time but we did checks on voltage etc readings at the passenger door connectors, which works fine, and compared to the readings at the dead drivers door. Only one cable differed, yellow with red trace iirc, power at passenger door non at the drivers. Think we found the other end of this cable at the becm and that has no continuancy through to the door. That's as far as we got over a month.
I fixed his sunroof switch pack switch though, I'm getting good at that.