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.

2 answers
POSS TWILIGHT SENTINAL IS BAD GET A DIAG AND EST
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.