As the other guys said the first step should be to take the door panel out and check to see if there's broken pieces or something. Remember that our cars are 14-17 years old, and the actuators of the windows are prone to wear with time they tend to lose power for any reason. It could be any reason.
I recently put P/W and P/L on my hatchie and my driver door window works great but my pass window act up from time to time, eventho I hear noise on the motor, the window don't move.
The problem is that the plastic components that connect the motor to the regulator breaks and even when the motor is working is not actually moving the glass. I know I got to change both window regulators but they are freakin' expensive (at least out here, got quote $380 per side from Honda), maybe I'll try aftermarket and see if it works. Or buy them online if the price is right. Hope this helps.
