I own a Chevrolet Cruze with OEM audio system as (13336630 head unit) and (12844844G information display) and (94563276 radio control face plate).
The problem is that the display is too small as it is only just two lines. I decided to upgrade this system to another OEM GM system.
I bought from ebay (22815634 head unit) and (12783136 information display) and (95914367 radio control face plate).
But unfortunately I get a "LOCKED" message in the display after installing all these new units.
It is my fault as I didn't make a good research before I get these stuff. I looked up for the solution and I get a conclsion that since the mid of 90's, all GM radio units are provided with anti-theft locking system. There are two 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.
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.
All this information is good. But the problem is I want the new OEM to be unlocked. I never find a solution in the internet for this issue. I called my local dealer for relearn the head unit to be paired with my vehicle VIN but they told me they can not do this. Or they are not so smart to do that
Please could anyone help me solving this problem:sad::sad::sad::sad::sad: