Question about 2002 Pontiac Grand Am

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I have a 02 pontiac grand am and the radio is locked the light that reads theftlock is on

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HAVE YOU OWNED THE CAR SINCE IT WAS NEW? THE POWER HAS BEEN INTERRUPTED FROM THE STEREO. IT WILL TAKE A LOCK CODE TO UNLOCK IT. REFER TO YOUR OWNERS MANUL OR TAKE IT TO THE LOCAL GM DEALERSHIP.

Posted on Feb 17, 2010

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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, you can try removing the fuse to your radio for 5 min and reconnect it. This will reset the radio back to default and re-read the Vin number to the PCM to match with the radio. At most time this will get your radio working again and all you have to do is to re program the pre-set and clock.

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Your '02 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.


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