PDF associated: /PT 70-77-0001.pdf

---

JDB0019 PT 70 77 0001 Rev1 930920 70 Rev 1 GM PASSLOCK Relearn Procedure All OBD II 1996 and newer GM vehicles equipped with the PASSLOCK anti theft system Vehicle will not start after the original ECM has been replaced The original ECM has a security code PASSLOCK stored in its memory that matches the vehicle s instrument panel cluster or security module if so equipped The replacement ECM can only receive the PASSLOCK code after it is installed in the vehicle and a relearn performed on the ECM Because the procedure is vehicle specific it will be necessary to reference the vehicle service manual or sources such as All Data or Mitchell on Demand for the correct procedure Problem Cause Solution Application