How do you program chip key for 2011 Buick lucerne?

To program a chip key for a 2011 Buick Lucerne, you'll need the existing programmed key and the new unprogrammed key. Insert the programmed key into the ignition and turn it to the "On" position without starting the engine. After 10 minutes, turn the key back to "Off," remove it, then insert the new key and turn it to the "On" position. Wait for the security light to turn off, indicating successful programming. If you don’t have a working key, it's best to consult a dealership or a professional locksmith.