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You can unplug the wire behind the driver seat (near the lower part of the tunnel) and then put a jumper into it. Move the seat full forward and you should see the wire comming out of the carpet.
If that doesn't do the job you may need to wring out the wiring.
Very easy mod.
Just unplug the connector next to the driver's right seat belt anchor bolt. This will disable both the warning light and the chime without causing any codes or other problems.