Just finished installation. Took me a little longer due to being very meticulous about routing the wiring harness. I used a different method of connecting the wires though. I routed my wires all the way to the engine compartment and went in through the large grommet under the brake booster. Then I connected the blue and green wire to the grey/green and brown/yellow coming from the x6 bcm connector(pink) just to the right of e-brake pedal. Pins 2 and 4 as per http://www.gmupfitter.com/files/media/photo/474/2014%20BBM%20Electrical%20section_10_18_2013_WIP.pdf page 155 and 156.
What I did was skim a very small amount of wire insulation off and soldered the wires together.
To me it seemed a lot easier then taking apart the door sill.
edit:
Oh yeah, 1 click of the remote unlocks the drivers door only, and 2 clicks unlocks the rest including the tailgate