Re: '02 RX300 Driver's side window switch and intermittent window operation/malfunction.
The drivers side window would become erratic, sometimes working, sometimes stopping mid-way, sometimes requiring window to go all the way down in order to go up, and finally, refusing to go up. We took it to the dealer last year, they ran tests and found "nothing", but did inform us next time the master switch would need to be replaced to the tune of over $700. Yikes. I decided to take the switch out and examine it. A tab in the front part of the wood bezel can be found and pushed in with a screwdriver (cover with tape), and removal of the assembly is easy. Take the connector off and turn the box over and start taking phillips screws out. No springs to worry about, it all comes apart in layers. The design is clever, as the top layer (directly under the switches) is a flexible plastic cover that isolates the circuit board, etc. from anything that may leak into the switches. As best as I can determine, there is NO electric passing through the switches themselves, they are only rockers forcing the plastic cover contact "pads" to the circuit board. I took WD40 and cleaned the pads with a paper towel, cleaned the contact points on the circuit board, then re-assembled all. In addition, I sprayed inside the plug connector (with the prongs) with WD40. Snapped all back together and all works like a charm. All I can say is something that I did in the process worked. Whether it was the cleaning of the pronged connector, or the contact "pads", something worked. You can spray WD40 all day long into the switches from on top, but I can tell you I think it's fruitless. Those switches have no electric in them, they are only mechanical rockers.
Hope this helps someone else. I almost had a stroke when they told me the part and install was over $700!!
