How to fix power door lock.

Hi,
I need some suggestion on how to fix the door lock problem. I am also considering getting it repaired but I would like to be able to
tell what exactly happen.
Here is the current condition.
Outside the car.
The power door lock doesn't work. I can only unlock the door with key and it only open that door. In the past I can unlock ever door when I use key on the passenger side by turning unlock 1 time. And by turning unlock 2 times at the driver side I can unlock ever door except the passenger door.
After open the door.
I tried to use the power door lock switch, but it doesn't work.
When turn on engine
The power door lock switch works after I turn on the electricity in the car. Hoever, the passenger door can't be unlocked or lock using the switch.
I think there is some kind of electricity problem as well as the problem specific with the passenger door. Can someone tell me what might be broken?
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