1. Insert the key into the ignition and turn it to the "ON" position.
2. Wait for the immobilizer warning light to go out.
3. Press and hold the "UNLOCK" button on the key fob for 3 seconds.
4. Release the "UNLOCK" button.
5. The immobilizer will now be reactivated.
Note: If the immobilizer warning light does not go out after 30 seconds, the immobilizer may be faulty. In this case, you will need to take your vehicle to a qualified mechanic to have the immobilizer repaired.