Hello I am new in the forum. First of all thank you for the detailed information. I have a problem maybe someone can help me. I did the retrofit from half electric heated seats to comfort seats. I was one week gathering information and reading schematics. All in all, my comfort seat ( I only installed the passenger for now) moves in every direction (from the controls in the seat) except for the lumbar support that does not work. The other problem I have is I have the error restrain system. Everything is connected except pin 21 and 22 from the seat connector. I have another question, why the ground and positive from the black small connector has to be isolated and in there the power should be taken from the yellow connector. I did not do that step because I thought they are both power cables with same diameter. What I did is rewired the power cables from the yellow connector of the car to the yellow connector of the seat (because it is in different pins). Thank you!