That's a little weird...
Earlier cars' wiper relay were only connected to the dash harness with a single 4-pole plug. (Very early ERAs used the original round switch with screw-on terminals. That switch is no longer available for anything close to a reasonable price.)
The other end of the early relay harness went through the firewall and connected directly to the wiper motor. I'm not sure what's going on with your car, since the relay appears to be completely missing. At any rate, you don't need the relay if you are willing to manually park the wipers. The
wiring troubleshooting guide has information on what goes where, and why.