Check out the SRS self diagnostic "without Consult" procedure starting on page BF-62 of the factory service manual - available at
www.infinitiservicemanual.com
You should be able to get a code that helps narrow down the fault.
Do you hear any noises when you try the window, or is it just dead? Crunching noises usually indicate a bad power window regulator (track that feeds the window from the p/w motor). This usually happens with a failure in the down position while you're out somewhere with a rain storm approaching.
Totally dead, and it's likely something is either disconnected, or possibly a LAN fault. Your '94 has a LAN system that handles a lot of functions... I believe it was the first year of LAN. Anyhow, there is a diagnostic procedure for LAN functions. Check out EL-85 +/- about 10 pages for that process.