I recently got an 03 i35 for my wife that's just moved in and it's probably the most smooth and comfortable car I've driven, however the seat was badly torn so I swapped it with a (what I thought was) matching seat from a scrapped 04 i35. I get the old seat out and the new one in, the power seats and memory all work, but the heated seat wiring is completely different. The seat from the 04 has 3 smaller wires (black,yellow,white) and the plug from the car has 4 thicker (black,yellow,green,red). I'm by no means an electrician I just dont want my wife to freeze on leather seats when it's 15 degrees out. If anyone has a solution it would be a huge help

 

The service manual shows them being almost identical. Can you take a picture of the 2 plugs?

 

first one is what's coming out of the seat and 2nd is what's coming from the car, I already cut the one from the seat off since I figured I'd have to splice it into something anyways

 

If it shows they're almost identical the only thing I can think of is maybe I left something on the old seat that came with the car

 

Those are not original to the car. They are aftermarket or from another make.

Can you see if the plugs are added to stock wires or if the heaters have been replaced?

 

I can see the square 4 pin plug being aftermarket, any idea what the one from the seat that I cut off is for? Trying to find a wiring diagram for the seat and I can't find anything

 

The other seats must have had aftermarket heaters installed. The button on the center console only lights up when that aftermarket plug is attached to it :/ thanks for the help though, I'm gonna try and find the part that goes into the seat