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Q: headlights will not come on at night. works when I use clicker to unlock doors. on 2003 Mercury Grand Marquis

want to know if it is a sensor and where would it be located. also, an approximate cost of repair.
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Will the headlights come on when you pull the flash to pass leaver? [turn signal lever} If so the LCM [lighting control module] is bad. I just had to put one in my car.
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