Power Sliding Door (Passenger Side) inoperable

If it does not make any noise or even ATTEMPT to open start simple--look for a fuse to be blown. Your owners manual will tell you where they are,,,not sure on the sienna(havent had to do fuses yet) but easy to find and replace...all the fuse housing covers usually have diagrams of what fuse is for what and where they are... there is also a little swich when you open it manually on the door (child safety switch) when the door is all the way opened you can see it easily on the area that latches when closed...on the siennas there is also a switch or button on dash down low that dis-engages the auto matic opening of door, so you can permenately open it yourself(non automatic) other than this,,motor must be gone,,,, but, pretty sure the fuse or switches will cure it. good luck