1999 Mercury Grand Marquis

Programming Guide for 1999 Keyless Entry Remote Fob

Important Notice: This vehicle supports onboard programming for standard keyless entry remote fobs using the ignition key. All remotes must be programmed during a single session. Remotes not included during this procedure will be erased from the system’s memory.

Programming Instructions:

  • Step 1: Sit in the driver’s seat with all doors closed. Ensure all remote fobs to be programmed are readily accessible.
  • Step 2: Insert the key into the ignition but do not start the vehicle.
  • Step 3: Within three seconds, turn the ignition from the OFF position to the RUN position four times, ending in the RUN position on the fourth cycle.
  • Step 4: Watch for confirmation—the door locks will automatically lock and unlock, indicating that the vehicle has entered remote programming mode.
  • Step 5: Within 20 seconds, press any button on the first remote fob. The door locks will cycle again to confirm the remote has been successfully programmed.
  • Step 6: If programming a second remote, press any button on it within 20 seconds of the previous one. The door locks will cycle again to indicate successful registration.
  • Step 7: Repeat Step 6 for any additional remotes. Each remote must be programmed within 20 seconds of the last.
  • Step 8: When all remotes have been programmed, turn the ignition to the OFF position. The system will exit programming mode.
  • Step 9: Remove the key and test each remote to ensure that lock and unlock functions operate as expected.
  • Step 10: If any remote fails to function, restart the process from Step 1, ensuring all steps are performed within the specified time limits.

Additional Considerations: All remotes must be programmed in the same session. Remotes not programmed during the session will no longer function. Timing is crucial. Delays in the ignition cycle or remote button presses can cause the system to exit programming mode prematurely. Ensure remote batteries are in good condition before starting, as weak batteries may interfere with signal transmission during the programming process.