If you have time please do a write up with pictures, especially with the electrical part(I'm not an electrician or a mechanic). I was so excited about this!!2015 +up sienna don't have the plug anymore, have to run two wires from the driver kick panel to the back, 2015 + switch is blue light inside the switch so it's different parts number, I did this on my friend's 2015 SE model just need two wire and two connector, I will upload some picture when i have time and share the parts number for switch on 2015+ sienna later when i have time.
thanks for this, it was really helpful. I ended up tracing the wires to the kick panel and tapping in there, like soThank pigpork, spent sometime this morning and found the 2pins to connect to from the switch to get power to the motors!!!! The red and yellow connection right in the middle of the connector.
I recently completed this upgrade on my 2016 LE. By the way, thanks pigpork for your instructions. Anyway on my 2016 LE the wires complete with the connector were already there on the passenger side near where the motor goes. I just had to run two wires over to the drivers side. The blue pug for the switch was also existing behind the blank where the switch goes. I purchased the switch from the dealer, plugged it in and everything worked perfectly. The switch part number for this van is 84835-08060. Thanks again.