I think you can fix the issue without having to purchase anymore parts. It is just a bad wire connection. Hopefully you can get to the other side of that fuse module that has the wire connections to it. Usually you can unclip things in order to get access to the other side.
A picture of the fuse module while it is installed in the vehicle might help me see how things are put together so I can advise on how to proceed in getting to the other side of it. I haven’t worked on a Lexus before.