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Daryl, Shop Owner, Master Mechanic
Category: GM
Satisfied Customers: 12549
Experience:  28 years experience, Master Mechanic
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2005 gmc: you unlock a radio

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how do you unlock a radio for a 2005 gmc serria with the 6 disk cd and with a bose system

Hello, and welcome to JA!! the only way to unlock this radio is with a GM tech 2 scan tool. here is how the system works.


The 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 2 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.

The only way to unlock the radio is by using a scan tool.

goodwrench9124, ASE Certified Technician
Category: GM
Satisfied Customers: 3432
Experience: 37 years of dealership exp. Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer
goodwrench9124 and 8 other GM Specialists are ready to help you
Customer: replied 8 years ago.
so can you put it in a different vehicle by using the scan tool
I see that goodwrench9124 is off line at this time and you have already accepted his very good answer so I will tell you the answer to what you are asking now. Yes you can install the radio into a different vehicle if you have it programmed (using the Tech II) after you install it.
Daryl, Shop Owner, Master Mechanic
Category: GM
Satisfied Customers: 12549
Experience: 28 years experience, Master Mechanic
Daryl and 8 other GM Specialists are ready to help you