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Congratulations on the purchase of your CT200h it's a very nice vehicle. I am also very sorry that you are unhappy with the warning tone when in reverse, A lot of people complain about it and I know that it can be annoying.
Now that tone can be changed into a single tone. Meaning you can make it only beep once to let you know you are in reverse and then stop and it wouldn't keep sounding.
On monday stop by your local lexus dealership, ask them to change the setting using their computer to change the tone from continual which it is now to a single tone.
With the single tone option selected the beep will beep for 1 second then stop beeping to stop distracting you.
The continual tone is standard on all lexus and toyota hybrids because they've found that often people forget their vehicles in reverse because the car is so quiet then it takes off in reverse if you let go of the brake pedal. So simply a safety reminder that the vehicle is in reverse still.
I hope this answers your question, Please let me know if you have any other questions for me.
One more thing that I forget to mention. The dealership will not charge anything to do this procedure and I would even say that you don't need an appointment to change the setting because it takes 2 minutes to do. Find your salesman and have them talk to service to get you in and out quickly.
Thanks for your answer. It is very helpful. Is it possible to lower the volume of the one-second continual beep, or is their only one volume?