RX-300 side mirror controler switch replace or repair
 

How to replace or or repair side mirror controller switch in Lexus RX-300. Mirror controller witch worked fine until my RX-300 was left outside for about a month.

I doubt it's really repairable. It looks like used switches are $10-20 on eBay; this would seem to be your best bet unless the problem is elsewhere. Good luck!

Thanks for the suggestion. I hadn't thought about checking on Ebay. Primarily I was wishing to avoid buying a new one from the Lexus dealer for $100+.
Tom/skipilot9

RX300 mirror mirror control switch repair
 

I purchased a replacement mirror controller switch and installed same. Mirror controller still does not work. All fuses in main fuse box OK. No power to mirror controller switch. Is there a fuse under/behind the dash that I should check? What could be the cause of no power to mirror controller switch.
Tom

I ordered a replacement switch and installed it. Mirrors still do not work. It is unlikely that both mirror motors would fail simultaneously so that is not believed to be the problem. What is the next item to test? Is there a fuse somewhere or solenoid somewhere that could have failed?

If you replaced the switch with a known good one and it still does not work I would go back and check your connections at the switch. I have had plenty of instances where when plugging something in it just pushed one of the connection points out of the connector block far enough to not work.

Check the CIG lighter fuse (15amp BLUE)) located behind the coin box.
1st row down, 3rd fuse.
That also powers the power mirror switch.
If you check the PINK wire on the side mirror switch connector, there should be battery voltage there with the key ON.
You should also check for ground in that same connector.
Usually a WHITE wire with a BLACK tracer.

Hope this helps.