4 pin to 7 pin w/ brake controller

2000 3.4 auto 4x4. Everything was good until I got to the cold side of the brake switch. My brake switch has four wires. GR/WH, GR/YL, BLU/WH & BLU/YL. Per the Toyota's electrical schematics the GR/WH is the cold side of the brake switch. Can anyone confirm that the GR/WH is the cold side wire? What do the two BLU wires do? I did not see those on the schematics.

I installed these two items:
https://www.etrailer.com/Accessorie...TBC7.html#exp-productdetails=.all-description

https://www.tekonsha.com/product/90160_trailer-brake-control-proportional

This video helped:
https://www.youtube.com/watch?v=AucPPkNqZs0

Thank you for your time and I appreciate it.

 

The brake input to your brake controller should be connected to Pin 1 (Green/White) of the brake light switch.

Pin 2 and 3 are power in to the brake light switch and Pin 4 is for the cruise.