Hello, this topic has been discussed many times lately, but no one could say more precisely about it… My V40 1.8 special edition has a full leather equipment, but (unfortunately) without seat heating – which I would like to retrofit now with ORIGINAL PARTS. Upon request with Volvo directly, this would be possible if the car is “pre-wired”. Otherwise this wiring would have to be done. The first dealer was of the opinion that my V40 was not wired, but the second confirmed that the wiring was available. According to the second dealer, then only 2 switches, 1 relay and 2 heating elements would be installed. …What does this look like with wiring? Is it done with the simple installation of the switches and plugs? And how is this with the famous seam in the middle of the seat, must be locked off the seat for the original heating cushions? What does this look like afterwards? Would the experts among you really super grateful for a quick answer!