hmm the dealer i went to for a key a few months back never asked me for proof drove in asked them to copy key
the lock smith didn't ask me for proof of ownership eighter that was for a spear key no crest key just generic for dad to keep in case he ever needed it in emergency me i only want the Cadillac crest key thats why i went to the dealer
but they never asked me for proof ownership
Keys are easy, just buy the correct transponder key from Ebay or where ever, have it cut at your local hardware store or lock smith to match your existing key. Put your original key in the ignition and start the car. Turn the car off take out the original and insert your new key within 10 seconds and turn it to the run position, as soon as the security light goes off (almost immediately) the new key is programmed. You can add as many as 10 keys. Key Fobs have to be programmed with a Tech 2 programmer, either your local dealer or mechanic with the tech 2 can do that in about 10 minutes.