RE: 91 Power Door Locks
take off the door panel and pull the actuator. Plug it into where it plugs in, and press the power door lock button. If the white thing at the top moves, try it again but stop it with your finger. If its fairly powerful, door lock actuator is fine. If it puts out a small amount of force or grinds, actuator is busted. If the white piece doesnt move at all, and the actuator makes NO noise/vibration/activity at all, it could be a number of things.
96 Accord LX 4cyl. 4dr AT w/o vtec (F22B2)
Security System / Keyless entry