Seat warmer and occupancy sensor
 

With my driver seat warmer acting up (hot spots burned a hole through leather) I am looking for repair alternatives.

Called the dealer and he says the replacement contains the leather, heating pad, and sensors including occupancy sensor.

So I am wondering if I disconnect the wires from the original heating pad remove it and replace it with an aftermarket pad, I need to know the function of each of the wires going into it in order to properly hook up the new pad.

Has anyone mapped out the wires goi g into the heating pad to get it functional with The rest of BMW systems?

Usually hot spot happens because the resistive element breaks but not all the way through. You get a high resistance spot. You can solder that spot back together or make a jumper across that area.

So cut through the padding to expose the wire, solder any jumper wire and tuck it back in. I will try it

Perrier, another option is to just replace the faulty seat with a good used one from your local wrecker or fleaBay. Depending on your seats and color, there are lower heated seat halves for $100 available and complete really nice front and rear sets for around $500.

Been looking for a couple of years for used seat bottom. Seen a few but not a single one found in equal condition to mine.
If I can cut/solder a small piece, I’m happy with a couple of inches of unheated spot. It’s right next to the seat belt buckle, wouldn’t miss it.

If the surface is already damaged you can make enough room to work. It's likely solder won't stick you'll need to use a butt splice connector.

I have a similar problem by my right kidney maybe I'll fix mine and write up an DIY.