Reverse with NO bongs!!

[madowl]

madowl: On the Tcson Ultimate facelift it's on the centre console, extreme left button (passenger) for UK cars.
Have tried that, but NO BONGS!

Try this
navigate to "Setup" > "Vehicle" > "Driver Assistance" > "Parking Safety" > "Parking Distance Warning Auto On" and enable the checkbox to activate the auto-on function