I'm afraid your keyboard just bought the farm. Keep in mind that the inside of a car can reach temperatures exceeding 165 degrees when left in direct sunlight. At that temperature, your keyboard's components would be fried, especially if exposed to those conditions for an extended period of time. Dave leads a charmed life or parks the car in the shade--probably both. At the very least, the mother board will likely have to be replaced. The switch pads can usually tolerate temperatures up to about 180 degrees before the plastic bubbles become deformed or pop.

Good Luck,

Gary