Alright well I got my TCC working the other day!!! On my 04' Colorado, the brake switch has two connectors. The connector I used has a pink ignition 12v hot coming into it, and then a purple wire which used to go to the BCM. Well I removed the purple wire and wired in my TCC wire from the LS1 harness and VOILA I have TCC now. I know yours will probably be different, but I figured I would update anyways....

BUMP!!!!!!!!!