Start by checking the fuses. If those are good, then you move on to the switch, make sure there's power going to the switch, and make sure the switch has continuity when it is engaged. If that checks out, unplug the wiper motor and ensure that power is getting to the wiper motor. If power is getting to it, jump the wiper motor from a power source other than the wiper motor circuit to verify that the fault is in the wiper motor... if it doesn't function at that point, then you need to replace it.
The wiper motors are fairly common... almost certain any of the major auto parts chains can get one, but I'd recommend giving Rock Auto a try first.
Remove the wiring harness from the back of your 1994 Chevy Cheyenne wiper motor. Remove the traveling arm linkage. Remove the wiper motor retaining bolts. Reverse the process to install the new wiper motor.
The wiper Motor is bad. Sorry
Inside the wiper motor.
It is a very good possibility the delay board that is attached to the wiper motor is bad. This part is available from the auto parts stores and can be changed without removing the wiper motor from vehicle.
Behind the plastic cover on the wiper motor.
The wiper motor on a 1998 Chevy Venture is up under the vents next to the windshield. It is bolted to the firewall.
It is in the motor.
First check fuses, relays to wiper motor. Then check power to wiper motor. Then check linkage to wiper motor.
It is right on the wiper motor, under the cowling, and on the motor, 3 wore connector
wiper motor or the bolts holding it tight.
It is attached to the wiper motor.
The Wiper reStore on eBay will restore your core for $199.95. Search for wiper motor restoration service.