Your vehicle has a passive theft-deterrent system.

The system works when the key is turned to ON. The key uses a transponder that matches an immobilizer control unit in your vehicle. Only the correct key will start the vehicle. If the key is ever damaged, you may not be able to start your vehicle.

When trying to start the vehicle, if the engine does not start and the security light comes on, the key may have a damaged transponder. Turn the ignition off and try again.

If the engine still does not start, and the key appears to be undamaged, try another ignition key. At this time, you may also want to check the fuse. See Fuses and Circuit Breakers . If the engine still does not start with the other key, your vehicle needs service. If your vehicle does start, the first key may be faulty. See your dealer/retailer who can service the theft-deterrent system and have a new key made.

It is possible for the theft-deterrent system decoder to learn the transponder value of a new or replacement key. Up to 10 additional keys may be programmed for the vehicle. The following procedure is for programming additional keys only.

Canadian Owners:  If you lose or damage your keys, only a dealer/retailer can service the theft-deterrent system to have new keys made. To program additional keys you will need two current driver's keys. You must add a step to the following procedure. After Step 2, repeat Steps 1 and 2 with the second current driver's key. Then continue with Step 3.

To program a new key do the following:

1. Verify that the new key has PK3+ stamped on it.
2. Insert the current driver's key in the ignition and start the engine. If the engine will not start see your dealer/retailer for service.
3. After the engine has started, turn the key to OFF, and remove the key.
4. Insert the key to be programmed and turn it to ON within ten seconds of removing the previous key.
5. The security light will turn off once the key has been programmed. It may not be apparent that the security light went on due to how quickly the key is programmed.
6. Repeat the Steps 1 through 4 if additional keys are to be programmed.

If the security light comes on and stays on while driving, you will be able to restart the engine if you turn it off. The theft-deterrent system, however, is not working properly and must be serviced by your dealer/retailer. Your vehicle is not protected by the theft-deterrent system at this time.

In an emergency, contact Cadillac Roadside Service. See Roadside Service .

Do not leave the key or device that disarms or deactivates the theft deterrent system in the vehicle.