I'm an out dated mechanic, but i believe the drivers seat belt assembly is the only assembly that has a switch to indicate if the lap belt is buckled. I'm not positive on that. The switch in the buckle (the part with the release switch on it) may be defective. To figure out if the switch is defective shouldn't be to hard. Inspect the buckle to find the wire or wires going to it, should be two wires. You may have to unbolt the buckle from the floor or seat to find the wires. Follow the wire(s) till you find the connector, the connector maybe tucked under the carpet. Disconnect the it and use a small piece of wire to jumper the connector, not the connector that goes to the buckle, the other connector. If the bell sound goes away, the buckle needs to be replaced.
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