2004 Mercury Mountaineer Owner Guide 2nd Printing (Spanish) - Page 403

Locks and Security 2. Turn the ignition from the 1 (OFF) position to the 3 (ON) position. Keep the ignition in the 3 (ON) position for at least three seconds, but no more than 10 seconds. 3. Turn the ignition to the 1 (OFF) position and remove the first coded key from the ignition. 4. Within ten seconds of turning the ignition to the 1 (OFF) position, insert the second previously coded key into the ignition. 5. Turn the ignition from the 1 (OFF) position to the 3 (ON) position. Keep the ignition in the 3 (ON) position for at least three seconds, but no more than 10 seconds. 6. Turn the ignition to the 1 (OFF) position and remove the second previously programmed coded key from the ignition. 7. Within twenty seconds turning the ignition to the 1 (OFF) position and removing the previously programmed coded key, insert the new unprogrammed key (new key/valet key) into the ignition. 8. Turn the ignition from the 1 (OFF) position to the 3 (ON) position. Keep the ignition in the 3 (ON) position for at least three seconds but not more than 10 seconds. 9. Remove the newly programmed coded key from the ignition. If the key has been successfully programmed it will start the vehicle's engine and the theft indicator light will illuminate for three seconds and then go out. If the key was not successfully programmed, it will not start your vehicle's engine and the theft indicator light will flash on and off, and you may repeat Steps 1 through 5. If failure repeats, bring your vehicle to your dealer to have the new key(s) programmed. To program additional new unprogrammed key(s), wait twenty seconds and then repeat this procedure from Step 1. 91