Pwr. Window Switch Problem '94 G20

[grampsrocks]

Hi! On my '94 G20 Conversion van, the passenger side power window opens fine, but won't close. It can only be closed again if two people do it, each "manning" a switch; one on the right & one on the left side. We then have to take turns pushing the "up" switch. With each push, the window raises a tiny fraction of an inch only. It also helps if a third party holds the glass between his hands, forcing it upward. Somone, somewhere, once told me he thought it had to do with a defective relay. If this is true, I'm still at a loss, as neither Haynes nor Chilton address this problem, nor do they even show any relays in the window system on their schematics. Any ideas? Thanks! Bob