Been busy chasing down loose ends after swapping a 5.3 in my 94 blazer. Got most things wrapped up except the tcc. Current did the harness and ECM, and he's not sure what my problem is. Brake switch is wired up via an extra relay to supply power to tcc but it will not lock up. ECM is getting mph and brake switch is registered in the data list but tcc is not commanded on. Any ideas? Thanks