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I have a friend with an 02 Sequoia and her rear window has not been working for over a year. Thanks to Andy4, post 22 of this thread, I fixed it easily today in about 30 minutes. You do it like this, and for free!
Raise lift gate
use a putty knife or similar to lift up top trim above window
do same for each side trim
remove screw holding strap on
use small scredriver to lift bottom corner of tail gate cover
slide putty knife in where you see clip and pry up
repeat with putty knife at each clip (8 I think total)
tailgate cover trim is now just held on at window, strike bottom to force it up and out of window
Remove electrical connectors to items on black metal window panel
Remove clips holding wire harnes by pushing in hidden clip on each end and pulling out on harness
Remove screws from panel then take it off (see TSB post)
Remove spring, 2 bolts, and then the 2 metal piece the bolts went to, one on the outside and the one you unscrewed the bolts from
Try the window now, I bet it works!
Replace all panels, wiring and trim

This is much easier than it sounds. Don't be scared off by the TSB. Once uncovered, you don't do anything except remove the spring and bolts and 2 metal pieces. Very easy.