It IS that part 
. Note, however, youâll 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. Thatâs 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?
             
            
              
              
              
            
            
           
          
            
            
              
Wouldnât be ironic to find $705 inside?
There isnât much for the average person to gain by looking inside a body controller/junction box.
             
            
              
              
              
            
            
           
          
            
            
              I wouldnât be able to resist.  Iâd want to figure out whatâs inside that makes it so expensive. When  my VW Rabbitâs junction box (really a relay box) broke and needed replacement I took the old one  apart just  to see whatâs inside.