1997 HONDA CRV - DOOR LOCKS

I have a 1997 HONDA CRV with power door locks.

I went to use the button on the drivers door to lock the doors as usual and found that only the drivers door locks and unlocks.

I have used the keyfob for the alarm and i found the same thing. Only the one door works.

The other three doors do not work. You can lock them manually however.

I took the door panels off of the two front doors and found that there is power to the switch on both doors, but the passenger door has a lower voltage than the drivers.

I've been told that the actuator is the problem. Do you think that this is really what the problem is?

Next question is... is there only an actuator on the drivers door or is there one on the other doors as well?

What else do you think this might be.