Power driven venting of a vehicle

A system for monitoring an aperture, comprising:

• a first emitter and receiver pair, said first emitter being disposed in opposing relation to said first receiver with respect to said aperture;
• a second emitter and receiver pair, said second emitter being disposed in opposing relation to said second receiver with respect to said aperture;
• and
• a controller for selectively activating said first and second emitter and receiver pairs and for receiving an output signal from said first and second receivers;
• wherein said first emitter and receiver pair is disposed proximate said aperture and substantially parallel to said second emitter and receiver pair, said first emitter being adjacent said second receiver and said first receiver being adjacent said second emitter.

A method of monitoring an area adjacent an aperture for an object disposed within said area, comprising:

• activating a first emitter to emit a first energy beam proximate said aperture;
• attempting to receive at least a portion of said first energy beam with a first receiver;
• generating a first output signal characteristic of said attempted receipt by said first receiver;
• activating a second emitter to emit a second energy beam proximate said aperture;
• attempting to receive at least a portion of said second energy beam with a second receiver;
• generating a second output signal characteristic of said attempted receipt by said second receiver;
• and
• comparing said first output signal to said second output signal to establish the presence or absence of said object.