ID Code Handling

One of 65,535 possible ID codes is stored in the immobilizer control unit's memory.
The ID code can be erased by using the scan tool's RESET ID CODE command. When the immobilizer control unit calculates a new ID code, the ECM ID code must be reset to match the immobilizer control unit ID code. To reset the ID code, refer to "ID Code Reprogramming."
During diagnostic procedures, the ID code can be read for comparison with the ECM ID code by using the scan tool's READ IMMOBILIZER CONTROL UNIT ID-CODE command.