How do you unlock radio for 2003 cadill?

To unlock the radio in a 2003 Cadillac, you'll typically need the radio code that was provided with the vehicle's original paperwork. If you don't have the code, you can retrieve it by contacting a Cadillac dealership with your vehicle's VIN. Some models may allow you to reset the radio by disconnecting the battery for a few minutes, but this won't always work for all units. Always refer to the owner's manual for specific instructions related to your model.