Seat heating rear, again

Hello.

I wanted to install the rear seat heating with separate switches (200 20V). Now my question, according to the schematic of the V8 a sensor is drawn in the heating mat and which is drawn in the 200 20V seperate. So I have a contact free at the V8 seat heating switch which I can not occupy !!! because it says that the contact goes directly to the feeler and I don't have it !!!
Can anyone help me?

gruss
Stefan