I do not think there is a relay for the window motor, you already checked the switch and fuse next come to test the motor. Do you hear a click sound of any kind when you press the window switch?
There are 2 wires screwed to a connection box on the bottom of the door, towards the hinges. Put a volt meter on it and press the switch, if you are getting 12V then you have problem with motor. If you are not getting the voltage, start trouble shooting backward, becuase your motor is OK but some thing is wrong with circuit. Another way of testing the motor is to connect 12V to motor and see if it runs.
87 420 SEL
Looking for a nice mid 80's MB diesel.
87 BMW 528e (Sold)
99 TOYOTA 4Runner
1989 Honda Accord (Sold)
1988 Honda Accord (Total)