I was trying to figure out why a driver's side window wasn't rolling up/down, and it ended up being a combination of a blown fuse, driver's side window motor, and driver's side master switch.

The windows work from their individual switches, but from the master switch I can only control the driver's side front and rear windows. Both passenger windows do not work from the master switch. I am thinking it's the multiplex control unit for the passenger side.

I want to know where this is located. I have Googled and think it may be a blue box under the passenger side fuse box / in that area? Does anyone have any experience with the same symptoms that I'm having, or is there any way to test it to be sure this is the culprit before I go putting a new on one? Thanks for any help.