I was just messing around with the CD that came with my Tundra DC and in the section for gauges and Toyota Adjustable Warning Indicators I found that the passenger side seatbelt chime can be disable through the dealer. I am guessing they just plug in their computer and go to the appropriate menu and just turn it off. Couldn't find it for the driver's side though. I accidently bumped into this while I was trying to make it so my keyless entry opened all my doors on the first button click. This as well as many other features all can be done by the dealer. I figure I will adjust a few on my first oil change scheduled for 5k miles. Lets see, had the truck 2 weeks yesterday and now 914 miles. Looks like I have over a month to figure out what else I want them to do.
Having the dealer do this certainly won't change any warranty issues and shouldn't piss off the insurance companies either. As a Toyota option, I am sure it will not effect passenger side airbag deployment. As for the dealers who said it was illegal, well . . . . I think you get the picture.
And of course, always wear your seatbelts. I have seen over and over again what happens when you don't. Remember, airbags only work for the first crunch during an accident and you decide to bounce off a few items they have deflated nearly as quickly as they inflate.
Paramedic Matt S
