How To Remove/Replace GM Passlock Ignition Key Lock Cylinder Replacement and Relearn/Recode Procedure

GM Passlock Ignition Lock Cylinder Replacement Instructions


NOTE: These instructions and pictures show how to replace the Ignition Lock Cylinder for the following vehicles:

2004-2005 Chevy Classic

2000-2005 Chevy Impala (Includes 04-05 Impala SS)

1997-2003 Chevy Malibu

2000-2005 Chevy Monte Carlo (Includes 04-05 Monte Carlo SS)

1999-2004 Olds Alero

1997-1999 Olds Cutlass

1998-2002 Olds Intrigue

1999-2005 Pontiac Grand Am

 The ignition lock cylinder contains the pass-lock security chip that is extremely common to fail on the above vehicles. A typical symptom of failure is the security light illuminating on the dash. Also keep in mind the electronic ignition switch is located just behind the lock cylinder. It is the plastic part that the ignition lock cylinder fits into. It contains the actual electrical connections and wiring and it sends current to numerous different components. This part is not as common as the lock cylinder, however many times it also needs replacement. You can purchase both the lock cylinder & electrical ignition switch below. A proper diagnosis is needed to verify these parts are failed or possibly failing intermittently.

Purchase Together:

OE: ACDelco D1493F Ignition Lock Cylinder & ACDelco D1432D Electronic Ignition Switch


Aftermarket: Standard Motor Products Electronic Ignition Switch & ACDelco Ignition Lock Cylinder

Removal and installation:

1)      Remove Trim panel around radio, on most vehicles this is just held in with snap-in clips, some vehicles may have a screw or two to remove

2)      Unbolt and remove the radio to gain access to the back of the lock cylinder

3)      Press the small release tab (see picture) While turning key to the ON Position

4)      Slide out old lock cylinder

5)      Installation is the reverse of the above procedures, see below for the relearn procedure


Relearn Procedure

1. Turn ON the ignition, with the engine OFF.

2. Attempt to start the engine, then release the key to ON (vehicle will not start).

3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.

4. Turn OFF the ignition, and wait 5 seconds.

5. Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the Passlock™ Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK).


The vehicle learns the Passlock™ Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.

6. Start the engine (the vehicle has now learned the Passlock™ Sensor Data Code and/or password).

7.  With a scan tool, clear any DTCs if needed (history DTCs will self clear after 100 ignition cycles).


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About Josh

I help manage the site here at Auto Repair Instructions. If you are having problems, then I am the one to contact.

Posted on October 22, 2010, in Chevrolet, Oldsmobile, Uncategorized. Bookmark the permalink. Leave a comment.

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