'94 R129 - immobile passenger seat & central locking

[E55BOF]

Now that the running issues are sorted :bannana:, time to get on with the rest; there's still plenty to do! The passenger seat does not move on the buttons, and (possibly not coincidentally?) the passenger door lock does nothing at all. The passenger door electric mirror and door puddle light are fine. The central locking works perfectly from the driver's door lock (blade key only - the fob is U/S, but the factory immobiliser has been disabled and an aftermarket item fitted, which works fine).

I suspect either a fuse(s) or door wiring fault. I don't have a fuse location chart for the car, so don't know where to start looking. Can anybody help?

I'll post this in the electrics section as well for maximum coverage; I hope the mods won't mind.