I occasionally have a box riding on my passanger seat which sets off the seatbelt warning tone and light. In my previous car, corolla, it was just a light that would flash. Problem was easy to fix, I just unplugged the light
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And if I had my way, I'd disable to the seatbelt warning chime on the passenger seat as well. The place I works has a fairly large campus, where a lot of times I'm toting some peice of equipment from point a to point b never leaving a parking lot, and that chime is just annoying.