if you have an AU1 you have smartlock not smartshield but eitherway if it is immobilised they can unlock it with their scan tool. with smartlock only you try this leave the ignition on for anything upto 61 minutes (thats what the manual says) the locks will cycle and the system will reset, this will not work with smartshield. if you have smartshield your remote will look like this. also with smartshield it could be the
ECU or the
BEM as they are both needed to enable the car if you replace either they need to be matched with the computer that plugs into the diagnostic port or it will remain disabled.
good luck