If you have a car imported from Japan and want to turn off the ETC (Electronic Toll Collection System) sound, please check this YouTube.
Here are three YouTube videos showing how to turn off the ETC sound.
I would be happy to be of help to Japanese car lovers.
[1] How to mute / turn off ETC Talkbox's Alarm voice (Import cars from Japan)
[2] How to switch off ETC startup sound?
[3] ETC alert sound off toyota land cruiser \ navigation\ japanes language
