Hashed out repeatedly with no apparent way out. But what I have figured out is a simple behavior mod on my own part. Mine was really only a problem when I would get in, start the truck, then buckle my seat belt. Reverse process, get in (can put key in ignition but don't start the truck) buckle seat belt then turn key = no chimes at all. Passenger seat belt chime seems to be on a delay, so even if I get ahead of passenger, 9 times out of 10, there's enough of a delay that it still doesn't go off. Yes it will still chime if key is left in ignition and door is opened, just need to remember to remove key. No, not totally disabled, just defeated - and liveable now.