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Reread the programing instructions. Below are the pages for programing. If the horn honks 4 times, it has returned to factory default mode. Restart the programing below.
Read the top of page 2.
NOTE: If the remote start fob button is held for
more than 3 seconds the system will chirp the horn
4 times, indicating the system has returned to
factory default settings. If this occurs return to step
1 of the programming section and reprogram the
remote start module.
There is no TACH programing for the 2010 Mercury Milan.