Nissan Repair: power door locks, nissan frontier, master switch

Question
I just bought a 2000 Nissan Frontier and the power door lock button nor the keyfob will lock or unlock the doors.  It has an anti-theft system installed.  Any ideas why the auto door lock does not work?  If I push the unlock button on the keyfob the lights blink, but that is it.

Answer
Maria,

Sounds like the master switch on the driver's door is broken.  It connects the power to the door locks.  If you get power to the body control module as evidenced by the lights flashing leads me to the master switch on the driver's door.  I say this since the master switch does not lock or unlock the doors either.  I have replaced three on my 2000 Maxima SE.