It wasn't until the 2003 model year that cars started getting seatbelt chimes that kept chiming when the car is moving. There is no song and dance to change it... the buzzer module is fairly simple.

The one in your car sounds like its working properly. It will only buzz when the key is first turned, and then only if the seatbelt is unhooked.

I suppose you could re-wire the system to buzz all the time the seatbelt is unhooked.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.