Try this... it fixed my problem whereby the 2005 Toyota Sienna passenger sliding door would sometimes open and sometimes not, yet I could hear the motor trying to open/close it. It cost me 20 minutes and 10 drops of oil, not $1200.
First, get the door open. It took me two weeks of constant trying, but it finally opened.
Next, remove the plastic covering of the inside door handle this way: locate the two screws on the forward edge of the sliding door near the child-safety switch: (the switch is a small lever near the door latch, on the forward edge of the door) loosen and remove the two phillips screws, one above the child-safety latch, and one below.
Remove the plastic cover to expose the gears for the door open/close mechanism.
There's a bunch of intricate plastic and metal parts in there, all coated with white grease. I used some 3-n-1 oil to lubricate everything in there thoroughly, In my case, there was one part that was a little void of grease, hence it "stuck" occasionally.
Test the system. If it's Okay, replace the plastic cover, and re-install the screws.
Now my Toyota Sienna 2005 door never fails to open or close.
To start, the noun "''rear latch switch'' is incorrect. It's actually called "Slide Door Lock". It's located on page BO-20 of the Toyota Repair Manual for the 2001 Sienna. There are two door locks on one sliding door. One in the front and one in the rear. Obviously, you want the one in the rear. The location for the "Slide Door Lock" (which also contains an electric switch) is in the rear of the sliding door located mid way up door. You can see (sliding door opened from the back) it without dissembling the door. And, the lock is made up of plastic (dirty white in color).
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