2 GM categories of the radio security theft lock feature

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There are 2 GM categories of the radio security theft lock feature.
1) The first category which was used on GM vehicles up until about 2001 or 2002 required the owner to choose a PIN and enter it into the radio to activate the radio security theft lock feature;
2)The second category which is used in newer Auto Scanner Tools GM Tech 2 has smart coding which is a scrambled portion of the vehicle VIN number.
Unlock radio code and VIN Relearn instruction
The only way to unlock the radio is by using the VIN Relearn procedure with a GM Tech2 scanner to set to module replacement setup.