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Model X Key? Door Handles?

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Not only that, but they need to be functional in case of an accident and/or total power loss. You can't assume that crawling out the front door is always possible.

I don't think the exterior handles will work on the Model S in a total power loss. The interior handles will still work on the front doors, as will the levers under the rear bench. But I think the exterior handles simply close a switch, which triggers an actuator, and thus require power to operate.