Rear heated seats question.

Hi folks. I own a 2014 Superb L&K with, I'm assuming, has rear heated seats fitted: the buttons are there in the rear but do not light up and seats do not heat. Both modules were replaced for the front seats and both of these work.

My questions are do the rear seats have a seperate module?

If so, any ideas where its located?

I've checked both the 5amp and 20amp fuses for rear seats, both seem ok.

Does anyone know the location of the relay?

Any other ideas why no illumination on buttons?

Thanks in advance

Bill