I'm hoping the 94 is the same as the 96. In which case, look under the driver's seat up front, under a wide plastic band. Remove the pop-in retainer to release the band, Inside is a plastic box with a removable cover. Inside the box are three identical relays. Swap the outer two and try again. If the 94 is different, then someone with a 94 will have to chime in.
Since the motor runs forward, it should be ok since all you are doing is reversing the polarity to drive it the other direction. The relay is used for both seats however the contacts inside could be bad for the passenger seat motor connection. The other possibility could be a broken wire as suggested before or something mechanical with the motor or transmission gears. You will need to troubleshoot further. My guess is the relay.