Hiya,
When you turn your headlights on do you here the relay click, i had a similer problem with my ae82 i had the 12v supply on the high beam switch had bad solder conection only worked when i flashed them but seen as u have replaced the switch, then only thing i can suggest is to grab a multi meter and check u have power to the high beam side of the switch ( it was a red with white strip on mine but not sure if the same for yours) if you have power there then work back down the line eg. connector, fuse etc untill u find the falt.
As for the rear wiper and washer it sounds like you have a crossed wire somewhere between your switch and them only thing to do trace the wires and find out where.
hope this is helpful
cheers
Jason
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