D4 Camera system inop

Hello all
2014 HSE, with the surround camera system
doesn't work at all. Press the cameras soft key in the display and nothing.
Camera's all seem fine, no damage - parking sensors work - anywhere else to look before committing to giving it to the garage to sort out ?
I understand the camera module is under the seat - and they go bad now and then ?

Thanks

It will need a scanning tool plugged into it to point you in the right direction, unless of course it has its own dedicated fuse?
Too new for me.

If none of the cameras show an image and the supervisor function isn't on screen, then check the module has power and the output cable / connector isn't damaged or has been pulled out.