2009 Mercury Mariner Owner's Manual - Page 100

Locks and Security 3. Turn the ignition to the 1 (off) position and remove the first coded key from the ignition. 4. After three seconds but within 10 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. After three seconds but within 20 seconds of 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 six 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 will operate the remote entry system (if the new key is an Integrated Keyhead Transmitter). The theft indicator light will illuminate for three seconds and then go out to indicate successful programming. If the key was not successfully programmed, it will not start your vehicle's engine and/or will not operate the remote entry features. The theft indicator light may flash on and off. Wait 20 seconds and you may repeat Steps 1 through 8. If failure repeats, bring your vehicle to your authorized dealer to have the new key(s) programmed. To program additional new unprogrammed key(s), wait 20 seconds and then repeat this procedure from Step 1. 100 2009 Mariner (mrn) Owners Guide, 2nd Printing USA (fus)