Looking for the Brake Light trigger wire (inside the cab)

2014 crewmax. I have searched the 700 plus page wiring diagrams and still have not found it ( physically) i can see it on the diagram. it appears to come through the passenger side fire wall, and passes through the passenger door jam. I have literally checked every single wire under the passenger door jam for power when stepping on the brake pedal (was not easy, but seriously checked every single wire) . and none showed anything. is it outside of the body? i wish the wiring diagrams gave a little more detail. I would like to find this wire while still inside the cab and some what easily accessible. I see in the diagram where it passes through the firewall, but its nearly impossible to access at that point. if I could just find it beyond that point would be great. I know i can find it closer to the rear of the truck but would love to get ahold of it inside the cab. (for NOD "reasons") Thanks for any help.

 

What are you trying to do with the brake input wire?

 

This thread would seems to indicate the 3rd brake light connector is under Drivers Left Kick Panel if that helps.
https://www.tundras.com/threads/third-brake-light-not-working.53595/

 

Looking to turn off brake lights at night I assume. Brake switch above the pedal, mine has a tan signal wire iirc, been a few years. Anyway, I believe there are 4 wires, pretty sure it was the heaviest guage in the group.