[jlex]

Have the same problem with my '88. Intermittent passenger window problem. You can use a DMM to make sure power is there. If it is, you've got a mechanical problem.
As your is an '89, you probably have a hex key in your toolkit that fits into the window gear that's hidden behind the (upper) door speaker. Remove the speaker grille to find it. I think there's a pic in the manual. Use the hex tool to wind the window up or down. Don't be surprised if it starts working. Mine acts up occasionally and that's how I free it up. Have also freed it up by banging the door panel in that area while operating the switch. Kinda like banging on a starter to make it work. In my case, I could replace the motor that's acting up, but some day......