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disabling the seatbelt wiring connector can cause issues is if you have an accident, you were not wearing your seat belt, and your car is inspected and deemed un-roadworthy.
Removing or disabling factory installed safety features is illegal and makes your car un-roadworthy. You would want to hope you don't get picked up for this if you get pulled over.
Full ArticleHolden fitted the seatbelt warning lights to the base Omega sedan and conducted a pole test in December 2008 in order to lift its ‘Commodore’ rating from four stars to five and stem the marketing advantage its archrival Ford Australia had with the five-star FG Falcon.
I think seatbelt warning chime & lights has more to do with the ANCAP rating than ADR
slide the driver seat forward and u will see the plug. its just a 2 pin one. this disables the seat belt chime.