Looking at SEC-126 of the 2009 FSM, the doors have switches that sink a BCM pin to ground when the door is closed. If I read things right (SEC-21), opening the door will trigger an alarm. Put your tilt switch in series with one of the door switches so that the tilt switch opens when tilted. The hood switch circuit will probably work the same way but I didn't see it in the wiring diagram.
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