Remove seats
If you are replacing the element in the back, it’s a lot easier to separate the seat and back. If your not sure if you’ll be able to put it back together, take lots of pictures or video to help you with assembly. You don’t want to mess around with the existing heat element. It broke for a reason and it’s way more work trying to repair it. Just replace it.

12V Carbon Fiber Universal Car Seat Heater Element Seat Warmer Heated Pad Kit. Make sure the pads in the kit or pad only can be cut. The element is placed on the foam, below the cover

I could not find any other way to repair these without removing them and pulling back the covers. It’s not hard to do but it does take time

https://www.ebay.ca/itm/184605171689


I did both seats and back for both passenger and driver 5 years ago and they still work perfectly.