Running Boards

I'm trying to install lighted running boards on my 04 Yukon. I want them to light up when you open the door or use the keyless entry. I'm having a difficult time finding the wire(s) I need to splice into to make this happen. Anyone provide me some help? thanks

After two weeks I finally have them installed. I installed the drivers side and they looked great. I looked under the passenger side and saw several AC lines blocking the place that holds the bracket. Moral of the story.........take it to a dealership and pay them $200 dollars to install the things!!!!!