I brought my crossfire for a alarm system.After a few days the mechanic gave me the bad news. He tried a lot and different mechanics but the car will not start. Even though the alarm is removed the engine will not turn over. I even can not read OBD codes, none, tried 3 different code reader and they all say "connection failure". I tried the violet starter wire behind the switch, it gives a solid 12v when turned but the violet wire that goes into the ECM just lights up a second. I do not hear any click of a relay. i soldered the wires in the relaybox no change, Where do i start finding the problem. Hope to find help here