The optical sensor is located on the right end of the right windshield defogger vent. In a bright environment (sunshine), turn Auto on and cover the sensor. It may take a few seconds for the headlights to come on and the dash lights to dim. If you problem is in synch with unblocking/blocking the sensor, there ya go.
Edit: See page EXL-163 of 2009 FSM for drawing of physical location.
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