I had a grand Cherokee with an inop seat heater. I got bold and yanked the cover off the seat only to find that the wire had burned a small divot in the foam and the wire burned apart. I repaired the wire, and the seat worked fine, but it was spooky how it burned.

the seat heater works on a resistance principal, much like an electric stove. so if the heating element has gone bad, or is starting to go bad, and the resistance is too great, it will overheat.

I bet someone with a Bentley can tell you the correct resistance for the element and you can measure with a multi meter at the harness connector.

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