ok so i have a 2006 northstar sts that ive been trying to fix for 3 weeks ive researched and circuit tested almost every part and article on this problem, i put a new ipm module in and check grounds power and communication on the high speed data bus, the issue is the vehicle will not start green light on start button does not illuminate and accersory mode turns on at its own will, i have no comminication to ipm, dscc, esc, if vehicle sits for an hour with negative battery cable disconnect it will run for 5 mins then act up, i have no idea where to contiune, i check other forums and check grounds under drivers seat no correction found