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By chance, was it the dealer in Bend??OK...as I mentioned earlier I took it to a a local Toyota dealer and they had no clue (pretty lame dealer we have here locally). So I called a Lexus dealer about 3 hours away and they think they can make this adjustment. This Lexus dealer is one of the top Lexus dealers in the country with excellent reputation and their service is fantastic, as this is an example of their service. I emailed them through their website and I immediately received a call from a service tech with possible solution, most dealers will not even follow up. Anyway they would need to hook up their computer to the vehicle and do a C-Best adjustment, whatever that means. But, yes I think this is doable to adjust the volume of the beep. I will follow up after I make the 3 hour trip to the Lexus dealer.