It is real simple, I had never done it until I replaced it on my friends 1998 Sienna LE. Need to remove the sliding door panel and you'll be able to see exactly what it takes to to.
This is a growing problem with many Sienna models, the only way to fix it, is to replace it, I would suggest you contact Toyota Corp. (find the number in your owners manual) with your defect, as I have placed a complaint of this defect with them, they responded by saying "the more complaints they receive the better the chances are they will recall this defect".
How do you remove and replace the motor for the drivers side power window in a 2000 Sienna
pull the handle
How to replace a starter in a 2009 toyota sienna
The child lock could be on.
You replace 2002 Toyota sienna fuel pump by contacting a person who knows how to replace it efficiently.
3.7 quarts to replace for Toyota sienna.
toyota sienna 2001
The Poer Sliding module is loctaed in the Right rear quarter panel. You will have to remove the trim to access it.
"How do you replace a factory antenna on a 2002 Toyota Sienna?" I am talking about the whole assembly. Thanks
how to replacemotor mount toyota sienna 2004
The same question for a 99 Sienna was answered on this site by referencing www.findonefindall.com/toyota-sienna/ The price quoted for the handle way $65.