RX300 Windows Mirrors Rear Wiper Issues

[NOMECHANIC]

Hello

I recently purchased an 01 RX 300 with 125K on the odo and in very nice shape.

I have one issue which may be several

1.Power mirrors do not work

2.Rear wiper and washer do not work

3.My right rear window will spontaneously drop partially while driving.

This happens spontaneously and to different degrees but seems to settle down after half an hour or so. 

Also there would seem to be a short in the master switch as tapping my knee along side the door will make this occur as I drive also

My question: Could this all be attributed to the same cause? Grounds associated with the switch perhaps? Or am I looking at multiple issues here?

Any help and suggestions would be appreciated

 

[eugene.s]

Perhaps corroded wires. I'd go to a mechanic to test the wiring for continuity.