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Why will my headlights stay on when car is off?

(2004 Pontiac Grand Am)
in Warren, OH on December 08, 2012
Typically when car is shut off, the head/tail lights will stay on for a short period of time. Yesterday, they decided to stay on no matter what. I flashed a flash light into the photo sensor and after a few seconds they shut off. Later that day, the same thing happened. I pulled the AUTO HDLPC and AUTO PRK relays from under the hood and now they seem to work as they should, but i have no tail lights. What seems more likely, the sensor being bad or one of the relays?
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