645ci Convertible - Parking sensor not beeping anymore?

[6BMW]

The parking sensors on my 6 have stopped beeping. They work fine visually via the Idrive no problem there but the audio beep has gone off........any idea's what could be causing this?

[S800VXR]

Have you checked the settings via I drive, I think you can choose if they beep or not, would pop out and check mine but its cold out!

[6BMW]

I've not changed any settings so doubt it's that...thanks for the suggestion..