i have a 2021 Subaru Impreza wagon I install the center button for the heated seats with an oem wire harness it lights up and button light when you press them i wish to add the heated seats i have one side of elements but where do it connect to on the heated seats elements there is two blue plugs one from upper and one from lower i assume the blue plugs plug in to each other on the lower element there is a white plug but where does that plug in to? do i need a oem wire harness to plug it in on and then it plugs to the main seat wire harness? the passanger seat there are only two plugs one for the air bags witch are also plugged in to the module then a second white plug seat belt and seat sensor but no plug for the heated seat to plug in to any ideas or pictures