How to Program a 2003 Mercury Grand Marquis Keyless Entry Remote Fob
Step by Step How to Programming Instructions:
1. Turn ignition from OFF to RUN 4 times within 3 seconds, with the 4th time ending in RUN. Door locks will cycle to confirm programming mode.
2. Within 20 seconds, press any button on first keyless remote. Door locks will cycle to confirm programming.
3. Within 20 seconds press any button on second keyless remote. Door locks will cylcle to confirm programming.
4. Turn ignition to OFF.
Can I Program an Ignition Key? ProgramAutoKeys.com