At the module there are 3 wires. B+(RD/LB, GRD(BK/LG), and LIN bus(WT/DG). LIN should have somewhere betwee 6-9 volts with key on, 10-12v key off and bus asleep(no scan tool on and timed out). If module is bad it should set code in cluster(CCN). If it is commu... Login to read more.