2004 Nissan Maxima cars door locks don't close or open

Hello! I have a after market car alarm that I can't figure out what's is the problem with the door locks when I open and close the door manually or with that the remote the door lock front left side and rear right side door lock don't work I have to close the car doors with the key I replace the brain of the alarm and still the same problem.
I took it to the dealer and the rep. told me the car doesn't have actuators on this 2004 Nissan maxima.
Can you please help me.