I was looking at some pictures.. and to me it looks like they plug into the cigarette light socket in the middle console. Now the pictures I saw, it could have been for something else.. But it looks like it plugs in to the light and into the seat.. Now if they is the case, that would be one thing I don't like about the car.. All the good looking interior to have the seats plug in, instead of a button.. Geez I hope that is now how they work..
Also I don't think GM would put them the information in he brochure saying that have heat seats.. and then not come with them.. I am sure they come with them.. And I sure hope its a buttom.. not a light socket plug in .I will get the pic