We have narrowed it down then, not that the problem area is going to jump right out at us but what we have determined is that somewhere it has lost the brake switch power, in between the fuse and the rear junction block.
The next easiest place to get to it is in the under hood junction block. Take the metal bar off that covers the top of the fuse block, there is 4 13mm bolts holding it in. Then remove the top cover and bottom cover of the fuse block. There is tangs on the bottom cover facing the engine
side, I put my fingers up under the bottom of the cover and pull the cover out to release it.
Next tip the fuse block up and with the brake pedal depressed check for power on Connector 3 Terminal F4. If there is power there, the open is between there and the rear junction block.
If there is not power there, check for power with the brake pedal depressed on Connector 1 Terminal E7. If there is power there the fuse block is bad, (not likely) if there is no power, then there is an open between that wire and the fuse block inside.
I will upload some diagrams to help, you can get back to me at your convenience, and depending on where we find the issue, sometimes it is cost effective just to run a new wire.
Here is the diagrams
If you need additional questions answered just post back here and it will alert me, thanks again for your patience. Aran