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Programming Car Keys at Home Reprogramming your car keys is a process that requires specialized equipment that only auto locksmiths have access to. Certain manufacturers have technology that blocks anyone except the dealership from reprogramming your keys. Start the process by inserting one of your keys that are blank into the ignition without starting the engine. The security light should turn on and stay lit for three seconds. If you hear a sound of a lock it means the process is done. Key fo