Password Learn Procedure For Anti-Theft System (Century & Regal)

Password learn procedure must be performed if Body Control Module (BCM) is replaced. A password is communicated between BCM and Powertrain Control Module (PCM) to provide engine operation. If BCM is replaced, the PCM must learn the new password from the BCM. If password learn procedure is not performed a Diagnostic Trouble Code (DTC) may be set in the PCM when attempting to start engine.
NOTE: Ensure battery is fully charged before proceeding.
Password learn procedure will take approximately 30 minutes. Ensure ignition switch is in LOCK position.
Turn ignition switch to RUN position. The SECURITY indicator light will come on and remain on for about 10 minutes. SECURITY indicator light is located on instrument panel, just to the left of engine coolant temperature gauge on the outside of the round indicator light assembly. Turn ignition switch to LOCK position for 5 seconds.
Repeat all procedures in step 3) two more times. Ensure ignition switch is in LOCK position. Turn ignition switch to START position. The engine should start. If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See the appropriate TESTS W/CODES article in ENGINE PERFORMANCE.