well; just came from my indy shop; and yes they confirmed that it is the master switch; so i am just gonna get one off ebay and put it in.

 

Cool deal, easy job for DIY.

 

I've got a 2004 Rx 330 with the same problem. Same rear window .Everything you said is my same exact problem.Been like that for about a year now.Dealer gave me a high repair price also. Like you, no one sits in my back seat and I never use that window.
I didn't fix it. I'm with Tomr51 Save your money.

 

yea; actually for right now im not even gonna bother doing anything right now. the only way i will do anything is if the front 2 windows stop working as i like to lower them for air while im driving.