How to Reprogram a Locked Car Radio

1). Consult your vehicle's paperwork. The unlock code for the radio will be printed on one or two business card-sized inserts. You have these if you are the vehicle's original owner or they were contained in the paperwork when you acquired the car. Consult the vehicle's User's Manual for the correct procedure to enter the four-digit unlock code. If you do not find the code you will have to obtain it from a dealer.
2). Locate the serial number of the radio. This is normally written on the metal casing of the body of the head unit. Remove the radio from the dashboard housing to view the serial number. Write down the serial number.
3). Call or visit the dealer for your vehicle. Ask for the service department. Provide a service technician with the serial number of the radio. Normally, he can access a database, which will provide the unlock code for this specific radio. You might be required to provide the car's registration details and a photo ID. Radio's can also be unlocked through online paid-for sources in the same way.
4). Consult the vehicle's User's Manual and follow the correct procedure to enter the four-digit unlock code and unlock your radio.