If you replace your PCM on some vehicles (Bonneville, Regal, Impala SS, Monte Carlo SS, and 2004+ Grand Prix) it will be necessary to perform this Security Relearn Procedure before the car can be started. No tools are required to complete this procedure and it can be accomplished 30 to 45 minutes after the PCM is initially installed.
For all vehicles except 2004+ Grand Prix:
-Try to start the vehicle.
-Turn ignition to OFF for 10 seconds.
-Turn ON (NOT START) the ignition (using a black Master Pass-Key III key, not a gray Valet key).
-Observe the SECURITY telltale on the dashboard. After approximately ten minutes it should turn off for the first time.
-Turn OFF the ignition and wait for ten seconds.
-Turn ON (NOT START) the ignition (using a black Master Pass-Key III key, not a gray Valet key).
-Observe the SECURITY telltale on the dashboard. After approximately ten minutes it should turn off for the second time.
-Turn OFF the ignition and wait for ten seconds.
-Turn ON (NOT START) the ignition (using a black Master Pass-Key III key, not a gray Valet key).
-Observe the SECURITY telltale on the dashboard. After approximately ten minutes it should turn off for the third time.
-Turn OFF the ignition and wait for ten seconds.
-Start the vehicle.
For 2004+ Grand Prix only:
-Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).
-Observe the SECURITY telltale on the digital information center. Leave key in the ON position.
-After approximately fifteen minutes turn OFF the ignition and wait for ten seconds.
-Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).
-Observe the SECURITY telltale on the digital information center. Leave key in the ON position.
-After approximately fifteen minutes turn OFF the ignition and wait for ten seconds.
-Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).
-Observe the SECURITY telltale on the digital information center. Leave key in the ON position.
-After approximately fifteen minutes turn OFF the ignition and wait for ten seconds.
-Start the vehicle.
-If you are having trouble getting your new PCM to re-learn your security system, try starting the procedure over without opening any of the vehicle doors.
For all vehicles except 2004+ Grand Prix:
-Try to start the vehicle.
-Turn ignition to OFF for 10 seconds.
-Turn ON (NOT START) the ignition (using a black Master Pass-Key III key, not a gray Valet key).
-Observe the SECURITY telltale on the dashboard. After approximately ten minutes it should turn off for the first time.
-Turn OFF the ignition and wait for ten seconds.
-Turn ON (NOT START) the ignition (using a black Master Pass-Key III key, not a gray Valet key).
-Observe the SECURITY telltale on the dashboard. After approximately ten minutes it should turn off for the second time.
-Turn OFF the ignition and wait for ten seconds.
-Turn ON (NOT START) the ignition (using a black Master Pass-Key III key, not a gray Valet key).
-Observe the SECURITY telltale on the dashboard. After approximately ten minutes it should turn off for the third time.
-Turn OFF the ignition and wait for ten seconds.
-Start the vehicle.
For 2004+ Grand Prix only:
-Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).
-Observe the SECURITY telltale on the digital information center. Leave key in the ON position.
-After approximately fifteen minutes turn OFF the ignition and wait for ten seconds.
-Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).
-Observe the SECURITY telltale on the digital information center. Leave key in the ON position.
-After approximately fifteen minutes turn OFF the ignition and wait for ten seconds.
-Try to start the vehicle by turning key to the START position (using a Master Pass-Key key, not a Valet key).
-Observe the SECURITY telltale on the digital information center. Leave key in the ON position.
-After approximately fifteen minutes turn OFF the ignition and wait for ten seconds.
-Start the vehicle.
-If you are having trouble getting your new PCM to re-learn your security system, try starting the procedure over without opening any of the vehicle doors.