I want to change the setting on the back-up beep from constant beeping to just one beep. Before I buy an OBD2 interface, I want to make sure I know where to plug it in. As near as I can tell, it's not mentioned in the owner's manual, and it doesn't seem to be where it was on the 2017 Prius Prime. I've been under the dashboard with a flashlight and mirror and still can't find it. Anyone know where it is?