I want to extract my radio code before i remove the old battery and replace it on my 2004 Grand Prix.

The "Theftlock" theft deterrent system is a feature on all base and uplevel radios. There is no need to
program a security code into the radio as in past model years. The theft deterrent system now utilizes
class 2 serial data to determine if the radio is in the appropriate vehicle. Each time the radio receives
the "run" power mode message, it compares the VIN information it has stored to the VIN information
received from a module on the class 2 serial data circuit responsible for transmitting that information.
If a mis-match occurs, the radio display will indicate to the user the radio is locked. Once this takes
place, a DTC will set, the radio will not respond to any button presses and become inoperative. The
two scenarios able to cause this condition are:

• A radio is installed from another vehicle.
• A module which communicates on the class 2 serial data circuit which supplies VIN information to the radio is replaced and not properly setup with the correct VIN information for that vehicle.