Yup it's the seatbelt warning. If you get a short glow plug light the buzzer continues. It's a good average for cycle time at least during warm months.

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Thanks,
Mark in NC

"Spark plugs?...We don't need no stinking spark plugs!"
1985 300SD "Der Silberne Schlitten" 420,000 mi


Wish these were diesel:
2003 Ford Club Wagon 130,000 mi