2003 Mercury Mountaineer Key Fob Programming Instructions
Obtain all remote transmitters for this vehicle.
1. Turn ignition from OFF to RUN 8 times within 10 seconds, with the 8th time ending in RUN. Door locks will cycle to confirm programming mode. (Off is the position where you can remove your key, RUN is the position just shy of starting your car.)
2. Within 20 seconds press any button on the first keyless remote to be programmed. Door locks will cycle to confirm programming. If you only have one remote then skip to step 4.
3. Within 20 seconds, press any button on the second keyless remote. Door locks will cycle again to confirm programming. Repeat step 3. for all other remotes.
4. Turn ignition to OFF. Locks will again cycle to indicate end of programming mode.