It IS that part 
. Note, however, you’ll need to check if it is compatible with your specific Highlander (I have a 2012 Highlander Limited 3.5 2WD).
Double check the symptoms as well. The locks on all 4 passenger doors stopped working - however, the back door would still lock. That’s how I narrowed down it was the junction box. Thank you guys. Cost for me was $705 for the part, MSRP $1038.
Did you take the old one apart?
Wouldn’t be ironic to find $705 inside?
There isn’t much for the average person to gain by looking inside a body controller/junction box.
I wouldn’t be able to resist. I’d want to figure out what’s inside that makes it so expensive. When my VW Rabbit’s junction box (really a relay box) broke and needed replacement I took the old one apart just to see what’s inside.