I have noticed that since I replaced the battery in my 2018 TH, the audible alert on the backup camera is not working. I have looked through the settings and the manual and only found a reference in the manual to a 'button/switch' to turn it on. However, I don't believe there is such a 'switch' to be found. I don't depend on the camera and recently I bumped something while backing up and not watching the camera display. An audible warning would have prevented that (no damage done.) Any assistance would be appreciated.