['97ventureowner]

Best thing to do is to check for the simplest, cheapest fix. That would be to lift off the panel that holds the switch and check for loose connections/wiring. At this time it might be a good idea to clean all contact surfaces and reinstall the connectors. If that doesn't do the trick, make sure power is getting to the switch. If power is present then you'll probably have to replace the switch itself.The drivers side switch is considered a master switch in that it also controls the passenger side window. This makes that switch slightly more expensive than the passenger side switch.
Another piece of advice I'd like to pass along is when you have the panel that holds the switch on the door open and accessible, it would be a good time to spray a little moisture dispersing spray like WD 40 on the wiring and connectors. One reason these switches have problems is moisture from rain and snow. How many times have you accidentally left your window open even a little bit and it rained? Or in the winter, sometimes during a heavy snow, you open your door to gain access to your vehicle and some snow falls into the van. Where does it usually end up? On top of the panel that houses the switches. When that snow melts, the water has to go somewhere and it usually infiltrates the area below the housing. Same as when rain enters a vehicle, it usually ends up pooling on the housing, and that's where problems can start. At least with a little spray on the connections and wires you can alleviate some of the problem.