I went through the BCM harness and checked the 12v source wires and they all read okay. Reading the diagnostic info in eSI it says to check between the sources and their corresponding ground but it does not say which grounds correspond to which inputs. Anyone have any info on that? Also, there is a 12v reference lead that goes to the ignition switch from the bcm, I am confused about that circuit but I am guessing the car wouldn't be running if it was bad.