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Re: 1995 GMC Yukon Radio says LOC
Press & hold the 2 & 3 buttons @ the same time for about 10 seconds; a 2 or 3 digit code will appear, write this # down,press & hold the am/fm button for about 10 seconds: another code will appear, write this # down, then call 1-800-537-5140 and enter 202108 followed by the * key, then enter the #'s that you wrote down from your radio followed by the * key. The call will give you a 3 or 4 digit override code. Write this code # down so you have it if you ever need it again. Enter this # into your radio following the instructions in your owners manual. If you get an override code that starts with 0, you drop the 0 when entering the code into your radio. If you don't have an owners manual, try this, press & hold the hour button until the first 2 digits of your code come up, then press & hold the minute button until the last 2 digits show. Then press the am/fm button. This should reset your stereo, if nothing happens you should leave your car running for 1 hour.
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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.
Thanks for using FixYa. If you fail to enter the correct code eight (8) times, the
radio goes into INOP mode. You have to wait an hour with the ignition on before
the radio returns to LOC mode (go for a long drive somewhere).
After that the the radio will go to LOC mode, then follow
this procedure to unlock it—
To unlock the car radio - Have a pen and paper ready. Push
and hold stereo preset buttons 2 and 3 simultaneously for several seconds.
Three digits will appear in the display "XXX", write them down. Push
the AM/FM button, three more digits will appear in display "YYY",
write them down.
Press 139010 then # (pound). You will be asked to enter your
four or six digit code followed by * (start)
Enter the six didgit number obtained from above procedure.
Listen to the four-digit number and write it down. It will
be repeated twice
Turn the ignition ON (The radio displays LOC)
Use the MN and HR buttons to enter the $ digit code that you
Press the AM/FM button. The radio display changes to SEC.
Your radio is now “un-locked” and usable. The Theft-Deterrent feature is STILL
active! If you want to disable it, use the instruction in Owner’s manual.
Please do accept the solution if the issue is resolved or else revert for further assistance.