Power window relay???

When it comes to the power windows i cant seem to find the J/C (junction connection) that the power goes thru to get to both switches. Looking at the schematics it doesnt say really what it is it just shows a box a J/C. Does anybody have any idea what it looks like and where i can find it? My passenger windows dont seem to b getting enough power and thats the only thing i cant find to check any help is appreciated