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Unlock code for radio

Battery went dead on 1997 chevy monte carlo and I don't have the radio unlock code because I bought the car used.

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  • mustangaaron Apr 06, 2009

    i dont have the lock code for the radio on my 1997 monte carlo


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Sorry to say this but you will need to go to your local gm dealer if this is a theftlock system. You wil need the serial number and proof of ownership for them to give you the unlock code.

Posted on Dec 21, 2008

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How to bypass security system on a 2003 chevy tahoe?

If you are refering to the Factory Alarm:
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Be sure the Battery is fully charged
Unlock the Door by using the Keyless Remote or Unlock at Driver Door with Key
Or, turn Ignition Switch to On position
If you are refering to the PassLock System (Security Light on Dash)
Be sure the Battery is fully charged
There is a 10 Minute Relearn by using Dealer Scan Tool
There is a 30 Minute Relearn (without Scan Tool):
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  • Observe the SECURITY telltale light; after approximately 10 minutes the telltale light will turn OFF.
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  • 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.
    Important: The vehicle learns the Passlock Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
  • Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password.
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