My 84 Porsche 928 has a chime that will not seem to shut off. Not sure what its related to. I fasten seat belts and make sure door are closed tight but chime will not stop.
Could be that the interior light switch in the door is not grounding out. Do the interior lights go on when you open the drivers door? If not that, then does the seatbelt light go out when you put the seatbelts on?
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