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GMC Forum: Radio 'locked'
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  #1  
Old 07-03-2010, 01:16 PM
jeffbro40 jeffbro40 is offline
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Default Radio 'locked'

hello everybody
I just bought a radio used and put it my 2004 envoy and it displays the word "locked"
I think it came out of a 2004 trailblazer.if anybody can help or advice it would be great!
thanks
Jeff
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  #2  
Old 07-03-2010, 06:51 PM
Molson02536 Molson02536 is offline
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Quote:
Originally Posted by jeffbro40 View Post
hello everybody
I just bought a radio used and put it my 2004 envoy and it displays the word "locked"
I think it came out of a 2004 trailblazer.if anybody can help or advice it would be great!
thanks
Jeff
Your '04 is too new to unlock on your own.

There are 2 types of GM Theftlock, Theftlock I and Theftlock II. The Theftlock I is found in pre 2000 vehicles, and Theftlock II is in the later models.

Theftlock I - Uses a volatile user settable code that is input through the key pad on the front of the Radio. If the power is lost (dead battery etc.) the code is gone and must be re-entered for the radio to work. But with the correct procedure the owner can unlock it.

Theftlock II - Uses an EPROM (erasable/programmable read only memory) or a PROM (the difference is you can not alter the prom once it is programmed).

In either case the code is burned in and holds even when the power is lost. With Theftlock II the radio is married to the vehicle by way of the VIN. When the vehicle is started the computer compares the number in the radio with the VIN in the body control module. If they match, the radio works, if not the radio displays LOC and you are finished, there is no easy way around it. The radio will not work until you make a trip to the dealer.


The dealer will use a TECH 2 scanner to change the VIN stored in the radio. The radio does not need to be removed (for the serial number or any other nonsense). The technician just plugs into the computer and resets the VIN in the radio.
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Old 02-27-2013, 04:11 PM
Ajcook5 Ajcook5 is offline
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Location: Illinois
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Quote:
Originally Posted by Molson02536 View Post
Your '04 is too new to unlock on your own.

There are 2 types of GM Theftlock, Theftlock I and Theftlock II. The Theftlock I is found in pre 2000 vehicles, and Theftlock II is in the later models.

Theftlock I - Uses a volatile user settable code that is input through the key pad on the front of the Radio. If the power is lost (dead battery etc.) the code is gone and must be re-entered for the radio to work. But with the correct procedure the owner can unlock it.

Theftlock II - Uses an EPROM (erasable/programmable read only memory) or a PROM (the difference is you can not alter the prom once it is programmed).

In either case the code is burned in and holds even when the power is lost. With Theftlock II the radio is married to the vehicle by way of the VIN. When the vehicle is started the computer compares the number in the radio with the VIN in the body control module. If they match, the radio works, if not the radio displays LOC and you are finished, there is no easy way around it. The radio will not work until you make a trip to the dealer.


The dealer will use a TECH 2 scanner to change the VIN stored in the radio. The radio does not need to be removed (for the serial number or any other nonsense). The technician just plugs into the computer and resets the VIN in the radio.
I have a similar problem. How much does the dealer charge to reset the radio vin?
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  #4  
Old 02-28-2013, 01:47 PM
GMC Customer Service GMC Customer Service is offline
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Originally Posted by Ajcook5 View Post
I have a similar problem. How much does the dealer charge to reset the radio vin?



Ajcook5,
Sometimes the radio code can be located on the front or backside of your owner's manual. It is a 4 digit code. If you do not have the code written in your owner's manual you will have to contact your dealer for this information. Please keep us posted and if you have any other questions please feel free to contact me anytime.
Thank you,
Stacy GMC Customer Service
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