The stock radio is programmed to work only for the VIN it was installed in. When a replacement radio is installed, the technician takes the Tech 2 diagnostic tool, and programs the new radio to the vehicle.
With the old anti-theft radios GM used, you the owner, programmed in a four digit code. If you forgot the code, and power was removed, the dealer could call a Delco help number, give the serial number of the radio and receive a number to re-activate the radio.
With the new radio, f power is removed, it looks at the VIN in the PCM or BCM, and re-activates itself.
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Black Sheep Hummer Squadron
(ME TOO)
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