I am interested in the find and fix with this problem as I have experienced the event 4 times. I removed, cleaned, and reinstalled the ground strap on the engine, seemed to correct the problem for a while. The next time I replaced the solenoid in the compartment by the front tire and that seemed to worked about three years. Now it has happened twice on the way home from Az. And I believe that the heat lite doesn't come on. Wished I had a schematic to know exactly where the wiring went.
Arden Smith