silverado courtesy lights

I'm installing an underbody light kit for my silverado and I want to use them as courtesy lights, one for each door. I know I need to diode isolate the doors, but I was wondering which wire to tie into. I know most of the door wires are at the BCM, and I was wondering if the one I need is there, and if so which one?

So you want them to come on when door is opened only...? Have you perused the relay section yet...? I dont think you are going to want to hook up directly...Use a relay...M.E.C.P & First-Class

Go slow and drink lots of water...Procrastinators' Unite...Tomorrow!

The lights are going to be hooked up to a switch and also to the 4th channel on my r/s. I intend to use a relay, I just need to know which wire to energize the relay. I only want the one side to come on with whichever door is opened.

I am having trouble finding the wiring info for each door.  I do not know when they stopped using the pinswitch on the side of the dash, Open the door and look for a plastic pin sticking out from the side of the dash.   If there is no switch there, the switch is inside the door at the latch.  If you can find the harness that goes into the door, and follow it back to a plug, or are willing to pierce the insulation on the wires, I can tell you how to locate the correct wire.  Let me know if you are willing to do that.

the switch is inside the door catch. I traced the wire back to the harness at the kick panel the two wires were tan and GREEN/ black. There was a third wire at the catch end of the harness, black, I assumed for ground.