2016 GLE 250 Radio not working

[SATURDAY KIDS]

Strange dilemma, whilst on holiday last week the radio has gone dead !
Everything else works fine ie sat nav media etc but push the radio button and nothing what so ever.
I want to sell the car ASAP but need to sort this first obviously any idea's would be greatly appreciated.

 

[ajlsl600]

Check which fuse provides radio power. Go from there.

 

[SATURDAY KIDS]

Thanks, I did look under the rear seat and the paper guide said fuse X where there wasn't even a fuse in place so I guess its not that.
Where else should I look ? Thanks in advance.

 

[ajlsl600]

Plug come off the back, does radio control light up at all at night?
In line fuse behind radio.? Very surprised if un fused