I was able to do it with an inexpensive bluetooth ELM adaptor with Carista...also the seatbelt chime ONE A2005 ?
I explained it this way to my service rep at the 1,000 mile checkup with my GenIII. "My wife, who likes the car generally, is so averse to the multi-beep reverse tone that she now won't drive it. While checking over the car, can someone change it to the one tone beep with the Techstream service cart? I hear it takes less than ten minutes to do that." (I had done my homework here) "Done!" he said, without even a hesitation. No charge. What made this even easier at the time for them was that they needed the Techstream laptop cart connected to the car anyway to make a service adjustment under warranty because of service advisement to correct something.
On our 3rd Gen, I'd asked at previous service intervals if they could disable the Reverse beep, and they always indicated there would be a charge. At the 60k service, I asked once again and they did it free. Persistence. ;-)
This is great news. I am scheduled to go in for a maintenance anyway, so maybe I'll get lucky and have them disable this darn thing for free!
Did mine with Elm327 Didn't like it Turned it back on Yea lots better knowing I'm in reverse! Just saying...
I have never worked in a garage, but I did work in a RV dealership here In Florida a couple of winters and boy do those flat rate RV techs try to milk every job ticket. I once saw a tech remove the trim from a slide room to fix one problem, reinstall the trim- then after lunch, take it back off to do another different repair, and he charged both times for a trim R&R on the work ticket! One R&R would have sufficed, but that was an extra 3/10ths of an hour money for him. ( and extra for the dealer) I worked by the hour, not flat rate, so I would never had done that sort of mickey mouse crap to pad the customer's bill. I did a lot of "free" roof inspections on motor homes and I always carried a can of leftover roof sealant from previous jobs with me. If I saw one or two cracks, I took a picture and then brushed on some sealant- and took another picture. I showed the customer the weathering issues on his roof and my "FREE" touch up, with a recommendation that he get his roof re-coated when they left Florida in the spring. (hopefully at North Trail RV). The shop foreman got wind of my goodwill services and put a stop to it, which was short sighted, IMO. The leftover material was essentially already paid for, and my time was only an extra minute or two. The news of a free RV service travels fast in campgrounds, and even if they don't buy extra services, they almost always buy something in the camp store before they leave.
Must be endemic! Most RV workshops over here rip off as much as possible also. Don't have an RV myself, but wife used to work accounts for one.
Flat rate mechanics learn how to game the system and charge for work they really didn't need to do- case in point. 7 years ago I took my Dodge minivan in for an issue with the fuel gauge reading low and for a factory recall on some system. When the ticket was handed to me, it said $79 diagnostic fee on fuel gauge- no issue found, works OK. I asked the service writer, if the tech had updated the software in BCM when they did the recall? (body computer module) "Yes", he replied I told the service writer, "Go back and ask the mechanic, did reloading the software also restore the faulty calibration in the electronic fuel gauge?" He came back in 5 minutes and told me the $79 charge was being removed from my bill. I wondered how many times that tech had done that trick and gotten away with padding his work ticket with work that he didn't actually do. I am glad I saw this thread, as I now know to make sure the backup beeper is reset to one beep, by the Toyota dealer, before I take delivery of a new or used Prius.