1999 Ford Explorer Owner Guide 1st Printing - Page 115
1999 Ford Explorer Manual
Page 115 highlights
Controls and features 5. Within 10 seconds of turning the ignition to OFF, insert the unprogrammed SecuriLock key (new key) into the ignition and turn the ignition from OFF to RUN (maintain ignition in RUN for at least one second). This step will program your new SecuriLock key. 6. To program additional SecuriLock key(s), repeat this procedure from step 1. If the programming procedure was successful, the new SecuriLock key(s) will start the vehicle's engine. The theft indicator (located on the instrument cluster) will light for three seconds and then go out. If the programming procedure was not successful, the new SecuriLock key(s) will not operate the vehicle's engine. The theft indicator will flash on and off. Wait at least one minute and then repeat the procedure from step 1. If failure repeats, bring your vehicle to your dealership to have the spare SecuriLock key(s) programmed. 115