07 Silverado NBS WT Door lock module installation

[wjarms]

I have a 2007 NBS WT Silverado and it has power locks....I am installing a key less entry module....I am trying to figure out where the location is of the wires that i have to tap into on the BCM module and how this reverse polarity lock system works exactly....any pictures or information would be greatly appriciated as this is my first post and I am need of help pretty bad 

 

I am installing a module only with remotes , using the factory actuators