Bought my 97 sr5 3 months ago and the rear driver side window started to work sometimes, then not at all. I finally figured it out!
First attempt I did was get a spare master control switch front the junk yard. I opened my original and found corrosion and burned button connections. I cleaned them and put them back together. Window still didn't roll up..
Wire brush and contact cleaner worked well.
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Next attempt I removed the rear driver side panel and tested the motor with my 18v impact gun battery. The motor works up and down. To test this you just reverse the polarity for it to roll up/down. Sorry I didn't take pics but you get the idea.
So then my 3rd attempt was to test the switch. I tested the switch by using a multimeter and checked if there was voltage when I press the button down and pull up the button. There was only 12v when I pressed down so I bought a used switch off eBay for 10 bucks shipped.
I plugged it in hoping it would solve the problem but no.. I tested for voltage again and gave me the same results, only down has voltage. Now for the finale..
Lastly, I took off both driver side panels checked the harness for any broken or damaged wires.. took roughly an hour to take apart and inspect..
Rear
So far so good then checked the pillar and in between the door
Then I checked the front door
And found THIS! 3 frayed wires that go to the rear window
Got them all connected and cleaned up. I tested the windows before I put everything back together and they work!! [emoji41]
Spent around 20 bucks for through the journey and maybe 3 hours total trying to diagnose the problem. Was worth it and I didn't find posts on this problem only rear window hatch stuff so I thought I would share. I also found help from a mr2 forum that said it's common for 90s Toyota's to have worn door harnesses. Better than going to a shop or spending $150 on a new harness. I have a video of the windows working but I don't know how to show it on here.
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