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Your code should be in owners manual if you no longer have code call gm dealear ask for service or parts give them vin and they should be able to help you
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You can call your local dealership either with the previous owners info and vin number or proof of ownership and your vin and they can get you the unlock code needed
call the dealer and find out it it can be done by the vin.
You may have to remove it and give them the numbers on the side of the radio
It will usually be free if you are the owner of the car
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. Thank you for using Fixya and you may want to try pulling the fuse to your radio for 2 min and then reinstalling it. This may reset your radio and have the ECM recognize the radio matching VIN number to the Trailbalzer.
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. Thank you for using fixya and keep us posted.
Hi:
You need to stop by your Olds dealership service department. with your vehicle, and they can get you the unlock code for the radio, using the VIN number of your car.
You have an anti theft radio. You will need to a local Chervrolet dealer and give them your vin number and they can give you the code and help you unlock the radio.
Call the dealer with the vin number to the vehicle some require the serial number off of the radio itself. They can get you the radio code for the truck. It will not cost you anything.
this is not true. all the dealer needs to due is to depress the #2 & #4 preset radio buttons to get a 6 diget code so they can call GM to get the 4 diget unlock code.
They just a bunch a money, however it does require some time even for someone that knows how to do it.
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